diff --git a/.circleci/config.yml b/.circleci/config.yml
index 0bbe76ffd..5669384c6 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -3,7 +3,7 @@ version: 2
 defaults: &defaults
   working_directory: /go/src/github.com/tendermint/tendermint
   docker:
-    - image: circleci/golang:1.10.3
+    - image: circleci/golang:1.11.4
   environment:
     GOBIN: /tmp/workspace/bin
 
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 46e9cb374..236b70723 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,60 @@
 # Changelog
 
+## v0.28.0
+
+*January 16th, 2019*
+
+Special thanks to external contributors on this release:
+@fmauricios, @gianfelipe93, @husio, @needkane, @srmo, @yutianwu
+
+This release is primarily about upgrades to the `privval` system -
+separating the `priv_validator.json` into distinct config and data files, and
+refactoring the socket validator to support reconnections.
+
+**Note:** Please backup your existing `priv_validator.json` before using this
+version.
+
+See [UPGRADING.md](UPGRADING.md) for more details.
+
+### BREAKING CHANGES:
+
+* CLI/RPC/Config
+  - [cli] Removed `--proxy_app=dummy` option. Use `kvstore` (`persistent_kvstore`) instead.
+  - [cli] Renamed `--proxy_app=nilapp` to `--proxy_app=noop`.
+  - [config] [\#2992](https://github.com/tendermint/tendermint/issues/2992) `allow_duplicate_ip` is now set to false
+  - [privval] [\#1181](https://github.com/tendermint/tendermint/issues/1181) Split `priv_validator.json` into immutable (`config/priv_validator_key.json`) and mutable (`data/priv_validator_state.json`) parts (@yutianwu)
+  - [privval] [\#2926](https://github.com/tendermint/tendermint/issues/2926) Split up `PubKeyMsg` into `PubKeyRequest` and `PubKeyResponse` to be consistent with other message types
+  - [privval] [\#2923](https://github.com/tendermint/tendermint/issues/2923) Listen for unix socket connections instead of dialing them
+
+* Apps
+
+* Go API
+  - [types] [\#2981](https://github.com/tendermint/tendermint/issues/2981) Remove `PrivValidator.GetAddress()`
+
+* Blockchain Protocol
+
+* P2P Protocol
+
+### FEATURES:
+- [rpc] [\#3052](https://github.com/tendermint/tendermint/issues/3052) Include peer's remote IP in `/net_info`
+
+### IMPROVEMENTS:
+- [consensus] [\#3086](https://github.com/tendermint/tendermint/issues/3086) Log peerID on ignored votes (@srmo)
+- [docs] [\#3061](https://github.com/tendermint/tendermint/issues/3061) Added specification for signing consensus msgs at
+  ./docs/spec/consensus/signing.md
+- [privval] [\#2948](https://github.com/tendermint/tendermint/issues/2948) Memoize pubkey so it's only requested once on startup
+- [privval] [\#2923](https://github.com/tendermint/tendermint/issues/2923) Retry RemoteSigner connections on error
+
+### BUG FIXES:
+
+- [build] [\#3085](https://github.com/tendermint/tendermint/issues/3085) Fix `Version` field in build scripts (@husio)
+- [crypto/multisig] [\#3102](https://github.com/tendermint/tendermint/issues/3102) Fix multisig keys address length
+- [crypto/encoding] [\#3101](https://github.com/tendermint/tendermint/issues/3101) Fix `PubKeyMultisigThreshold` unmarshalling into `crypto.PubKey` interface
+- [p2p/conn] [\#3111](https://github.com/tendermint/tendermint/issues/3111) Make SecretConnection thread safe
+- [rpc] [\#3053](https://github.com/tendermint/tendermint/issues/3053) Fix internal error in `/tx_search` when results are empty
+  (@gianfelipe93)
+- [types] [\#2926](https://github.com/tendermint/tendermint/issues/2926) Do not panic if retrieving the privval's public key fails
+
 ## v0.27.4
 
 *December 21st, 2018*
@@ -17,9 +72,8 @@
 ### BREAKING CHANGES:
 
 * Go API
-
-- [dep] [\#3027](https://github.com/tendermint/tendermint/issues/3027) Revert to mainline Go crypto library, eliminating the modified
-  `bcrypt.GenerateFromPassword`
+  - [dep] [\#3027](https://github.com/tendermint/tendermint/issues/3027) Revert to mainline Go crypto library, eliminating the modified
+    `bcrypt.GenerateFromPassword`
 
 ## v0.27.2
 
diff --git a/CHANGELOG_PENDING.md b/CHANGELOG_PENDING.md
index 2283ff370..332cfbf76 100644
--- a/CHANGELOG_PENDING.md
+++ b/CHANGELOG_PENDING.md
@@ -1,4 +1,4 @@
-## v0.27.4
+## v0.29.0
 
 *TBD*
 
@@ -21,4 +21,3 @@ Special thanks to external contributors on this release:
 ### IMPROVEMENTS:
 
 ### BUG FIXES:
-
diff --git a/DOCKER/build.sh b/DOCKER/build.sh
index ee617cc63..2aa42a6cd 100755
--- a/DOCKER/build.sh
+++ b/DOCKER/build.sh
@@ -3,7 +3,7 @@ set -e
 
 # Get the tag from the version, or try to figure it out.
 if [ -z "$TAG" ]; then
-	TAG=$(awk -F\" '/Version =/ { print $2; exit }' < ../version/version.go)
+	TAG=$(awk -F\" '/TMCoreSemVer =/ { print $2; exit }' < ../version/version.go)
 fi
 if [ -z "$TAG" ]; then
 		echo "Please specify a tag."
diff --git a/DOCKER/push.sh b/DOCKER/push.sh
index 32741dce8..f228406d4 100755
--- a/DOCKER/push.sh
+++ b/DOCKER/push.sh
@@ -3,7 +3,7 @@ set -e
 
 # Get the tag from the version, or try to figure it out.
 if [ -z "$TAG" ]; then
-	TAG=$(awk -F\" '/Version =/ { print $2; exit }' < ../version/version.go)
+	TAG=$(awk -F\" '/TMCoreSemVer =/ { print $2; exit }' < ../version/version.go)
 fi
 if [ -z "$TAG" ]; then
 		echo "Please specify a tag."
diff --git a/README.md b/README.md
index 7c386ec3a..601e3830e 100644
--- a/README.md
+++ b/README.md
@@ -1,8 +1,8 @@
 # Tendermint
 
 [Byzantine-Fault Tolerant](https://en.wikipedia.org/wiki/Byzantine_fault_tolerance)
-[State Machine Replication](https://en.wikipedia.org/wiki/State_machine_replication).
-Or [Blockchain](https://en.wikipedia.org/wiki/Blockchain_(database)) for short.
+[State Machines](https://en.wikipedia.org/wiki/State_machine_replication).
+Or [Blockchain](https://en.wikipedia.org/wiki/Blockchain_(database)), for short.
 
 [![version](https://img.shields.io/github/tag/tendermint/tendermint.svg)](https://github.com/tendermint/tendermint/releases/latest)
 [![API Reference](
@@ -49,7 +49,7 @@ For examples of the kinds of bugs we're looking for, see [SECURITY.md](SECURITY.
 
 Requirement|Notes
 ---|---
-Go version | Go1.10 or higher
+Go version | Go1.11.4 or higher
 
 ## Documentation
 
@@ -66,49 +66,26 @@ See the [install instructions](/docs/introduction/install.md)
 - [Remote cluster using terraform and ansible](/docs/networks/terraform-and-ansible.md)
 - [Join the Cosmos testnet](https://cosmos.network/testnet)
 
-## Resources
-
-### Tendermint Core
-
-For details about the blockchain data structures and the p2p protocols, see the
-the [Tendermint specification](/docs/spec).
-
-For details on using the software, see the [documentation](/docs/) which is also
-hosted at: https://tendermint.com/docs/
-
-### Tools
-
-Benchmarking and monitoring is provided by `tm-bench` and `tm-monitor`, respectively.
-Their code is found [here](/tools) and these binaries need to be built seperately.
-Additional documentation is found [here](/docs/tools).
-
-### Sub-projects
-
-* [Amino](http://github.com/tendermint/go-amino), a reflection-based improvement on proto3
-* [IAVL](http://github.com/tendermint/iavl), Merkleized IAVL+ Tree implementation
-
-### Applications
-
-* [Cosmos SDK](http://github.com/cosmos/cosmos-sdk); a cryptocurrency application framework
-* [Ethermint](http://github.com/cosmos/ethermint); Ethereum on Tendermint
-* [Many more](https://tendermint.com/ecosystem)
+## Contributing
 
-### Research
+Please abide by the [Code of Conduct](CODE_OF_CONDUCT.md) in all interactions,
+and the [contributing guidelines](CONTRIBUTING.md) when submitting code.
 
-* [The latest gossip on BFT consensus](https://arxiv.org/abs/1807.04938)
-* [Master's Thesis on Tendermint](https://atrium.lib.uoguelph.ca/xmlui/handle/10214/9769)
-* [Original Whitepaper](https://tendermint.com/static/docs/tendermint.pdf)
-* [Blog](https://blog.cosmos.network/tendermint/home)
+Join the larger community on the [forum](https://forum.cosmos.network/) and the [chat](https://riot.im/app/#/room/#tendermint:matrix.org).
 
-## Contributing
+To learn more about the structure of the software, watch the [Developer
+Sessions](https://www.youtube.com/playlist?list=PLdQIb0qr3pnBbG5ZG-0gr3zM86_s8Rpqv)
+and read some [Architectural
+Decision Records](https://github.com/tendermint/tendermint/tree/master/docs/architecture).
 
-Yay open source! Please see our [contributing guidelines](CONTRIBUTING.md).
+Learn more by reading the code and comparing it to the
+[specification](https://github.com/tendermint/tendermint/tree/develop/docs/spec).
 
 ## Versioning
 
-### SemVer
+### Semantic Versioning
 
-Tendermint uses [SemVer](http://semver.org/) to determine when and how the version changes.
+Tendermint uses [Semantic Versioning](http://semver.org/) to determine when and how the version changes.
 According to SemVer, anything in the public API can change at any time before version 1.0.0
 
 To provide some stability to Tendermint users in these 0.X.X days, the MINOR version is used
@@ -145,8 +122,40 @@ data into the new chain.
 However, any bump in the PATCH version should be compatible with existing histories
 (if not please open an [issue](https://github.com/tendermint/tendermint/issues)).
 
-For more information on upgrading, see [here](./UPGRADING.md)
+For more information on upgrading, see [UPGRADING.md](./UPGRADING.md)
 
-## Code of Conduct
+## Resources
+
+### Tendermint Core
+
+For details about the blockchain data structures and the p2p protocols, see the
+[Tendermint specification](/docs/spec).
+
+For details on using the software, see the [documentation](/docs/) which is also
+hosted at: https://tendermint.com/docs/
+
+### Tools
+
+Benchmarking and monitoring is provided by `tm-bench` and `tm-monitor`, respectively.
+Their code is found [here](/tools) and these binaries need to be built seperately.
+Additional documentation is found [here](/docs/tools).
+
+### Sub-projects
+
+* [Amino](http://github.com/tendermint/go-amino), reflection-based proto3, with
+  interfaces
+* [IAVL](http://github.com/tendermint/iavl), Merkleized IAVL+ Tree implementation
+
+### Applications
+
+* [Cosmos SDK](http://github.com/cosmos/cosmos-sdk); a cryptocurrency application framework
+* [Ethermint](http://github.com/cosmos/ethermint); Ethereum on Tendermint
+* [Many more](https://tendermint.com/ecosystem)
+
+### Research
+
+* [The latest gossip on BFT consensus](https://arxiv.org/abs/1807.04938)
+* [Master's Thesis on Tendermint](https://atrium.lib.uoguelph.ca/xmlui/handle/10214/9769)
+* [Original Whitepaper](https://tendermint.com/static/docs/tendermint.pdf)
+* [Blog](https://blog.cosmos.network/tendermint/home)
 
-Please read, understand and adhere to our [code of conduct](CODE_OF_CONDUCT.md).
diff --git a/UPGRADING.md b/UPGRADING.md
index 63f000f59..edd50d9e1 100644
--- a/UPGRADING.md
+++ b/UPGRADING.md
@@ -3,6 +3,55 @@
 This guide provides steps to be followed when you upgrade your applications to
 a newer version of Tendermint Core.
 
+## v0.28.0
+
+This release breaks the format for the `priv_validator.json` file
+and the protocol used for the external validator process.
+It is compatible with v0.27.0 blockchains (neither the BlockProtocol nor the
+P2PProtocol have changed).
+
+Please read carefully for details about upgrading.
+
+**Note:** Backup your `config/priv_validator.json`
+before proceeding.
+
+### `priv_validator.json`
+
+The `config/priv_validator.json` is now two files:
+`config/priv_validator_key.json` and `data/priv_validator_state.json`.
+The former contains the key material, the later contains the details on the last
+message signed.
+
+When running v0.28.0 for the first time, it will back up any pre-existing
+`priv_validator.json` file and proceed to split it into the two new files.
+Upgrading should happen automatically without problem.
+
+To upgrade manually, use the provided `privValUpgrade.go` script, with exact paths for the old
+`priv_validator.json` and the locations for the two new files. It's recomended
+to use the default paths, of `config/priv_validator_key.json` and
+`data/priv_validator_state.json`, respectively:
+
+```
+go run scripts/privValUpgrade.go <old-path> <new-key-path> <new-state-path>
+```
+
+### External validator signers
+
+The Unix and TCP implementations of the remote signing validator
+have been consolidated into a single implementation.
+Thus in both cases, the external process is expected to dial
+Tendermint. This is different from how Unix sockets used to work, where
+Tendermint dialed the external process.
+
+The `PubKeyMsg` was also split into separate `Request` and `Response` types
+for consistency with other messages.
+
+Note that the TCP sockets don't yet use a persistent key,
+so while they're encrypted, they can't yet be properly authenticated.
+See [#3105](https://github.com/tendermint/tendermint/issues/3105).
+Note the Unix socket has neither encryption nor authentication, but will
+add a shared-secret in [#3099](https://github.com/tendermint/tendermint/issues/3099).
+
 ## v0.27.0
 
 This release contains some breaking changes to the block and p2p protocols,
diff --git a/abci/cmd/abci-cli/abci-cli.go b/abci/cmd/abci-cli/abci-cli.go
index 50972ec30..cc3f9c452 100644
--- a/abci/cmd/abci-cli/abci-cli.go
+++ b/abci/cmd/abci-cli/abci-cli.go
@@ -58,7 +58,7 @@ var RootCmd = &cobra.Command{
 	PersistentPreRunE: func(cmd *cobra.Command, args []string) error {
 
 		switch cmd.Use {
-		case "counter", "kvstore", "dummy": // for the examples apps, don't pre-run
+		case "counter", "kvstore": // for the examples apps, don't pre-run
 			return nil
 		case "version": // skip running for version command
 			return nil
@@ -127,10 +127,6 @@ func addCounterFlags() {
 	counterCmd.PersistentFlags().BoolVarP(&flagSerial, "serial", "", false, "enforce incrementing (serial) transactions")
 }
 
-func addDummyFlags() {
-	dummyCmd.PersistentFlags().StringVarP(&flagPersist, "persist", "", "", "directory to use for a database")
-}
-
 func addKVStoreFlags() {
 	kvstoreCmd.PersistentFlags().StringVarP(&flagPersist, "persist", "", "", "directory to use for a database")
 }
@@ -152,10 +148,6 @@ func addCommands() {
 	// examples
 	addCounterFlags()
 	RootCmd.AddCommand(counterCmd)
-	// deprecated, left for backwards compatibility
-	addDummyFlags()
-	RootCmd.AddCommand(dummyCmd)
-	// replaces dummy, see issue #196
 	addKVStoreFlags()
 	RootCmd.AddCommand(kvstoreCmd)
 }
@@ -291,18 +283,6 @@ var counterCmd = &cobra.Command{
 	},
 }
 
-// deprecated, left for backwards compatibility
-var dummyCmd = &cobra.Command{
-	Use:        "dummy",
-	Deprecated: "use: [abci-cli kvstore] instead",
-	Short:      "ABCI demo example",
-	Long:       "ABCI demo example",
-	Args:       cobra.ExactArgs(0),
-	RunE: func(cmd *cobra.Command, args []string) error {
-		return cmdKVStore(cmd, args)
-	},
-}
-
 var kvstoreCmd = &cobra.Command{
 	Use:   "kvstore",
 	Short: "ABCI demo example",
diff --git a/blockchain/reactor.go b/blockchain/reactor.go
index e62a9e4fe..bed082cd3 100644
--- a/blockchain/reactor.go
+++ b/blockchain/reactor.go
@@ -432,11 +432,7 @@ type bcBlockResponseMessage struct {
 
 // ValidateBasic performs basic validation.
 func (m *bcBlockResponseMessage) ValidateBasic() error {
-	if err := m.Block.ValidateBasic(); err != nil {
-		return err
-	}
-
-	return nil
+	return m.Block.ValidateBasic()
 }
 
 func (m *bcBlockResponseMessage) String() string {
diff --git a/blockchain/reactor_test.go b/blockchain/reactor_test.go
index ac499efa6..f6c29d65d 100644
--- a/blockchain/reactor_test.go
+++ b/blockchain/reactor_test.go
@@ -42,7 +42,7 @@ func randGenesisDoc(numValidators int, randPower bool, minPower int64) (*types.G
 }
 
 func makeVote(header *types.Header, blockID types.BlockID, valset *types.ValidatorSet, privVal types.PrivValidator) *types.Vote {
-	addr := privVal.GetAddress()
+	addr := privVal.GetPubKey().Address()
 	idx, _ := valset.GetByAddress(addr)
 	vote := &types.Vote{
 		ValidatorAddress: addr,
diff --git a/cmd/priv_val_server/main.go b/cmd/priv_val_server/main.go
index 03aa57f4e..768b9cf63 100644
--- a/cmd/priv_val_server/main.go
+++ b/cmd/priv_val_server/main.go
@@ -3,6 +3,7 @@ package main
 import (
 	"flag"
 	"os"
+	"time"
 
 	"github.com/tendermint/tendermint/crypto/ed25519"
 	cmn "github.com/tendermint/tendermint/libs/common"
@@ -13,9 +14,10 @@ import (
 
 func main() {
 	var (
-		addr        = flag.String("addr", ":26659", "Address of client to connect to")
-		chainID     = flag.String("chain-id", "mychain", "chain id")
-		privValPath = flag.String("priv", "", "priv val file path")
+		addr             = flag.String("addr", ":26659", "Address of client to connect to")
+		chainID          = flag.String("chain-id", "mychain", "chain id")
+		privValKeyPath   = flag.String("priv-key", "", "priv val key file path")
+		privValStatePath = flag.String("priv-state", "", "priv val state file path")
 
 		logger = log.NewTMLogger(
 			log.NewSyncWriter(os.Stdout),
@@ -27,18 +29,26 @@ func main() {
 		"Starting private validator",
 		"addr", *addr,
 		"chainID", *chainID,
-		"privPath", *privValPath,
+		"privKeyPath", *privValKeyPath,
+		"privStatePath", *privValStatePath,
 	)
 
-	pv := privval.LoadFilePV(*privValPath)
+	pv := privval.LoadFilePV(*privValKeyPath, *privValStatePath)
+
+	var dialer privval.Dialer
+	protocol, address := cmn.ProtocolAndAddress(*addr)
+	switch protocol {
+	case "unix":
+		dialer = privval.DialUnixFn(address)
+	case "tcp":
+		connTimeout := 3 * time.Second // TODO
+		dialer = privval.DialTCPFn(address, connTimeout, ed25519.GenPrivKey())
+	default:
+		logger.Error("Unknown protocol", "protocol", protocol)
+		os.Exit(1)
+	}
 
-	rs := privval.NewRemoteSigner(
-		logger,
-		*chainID,
-		*addr,
-		pv,
-		ed25519.GenPrivKey(),
-	)
+	rs := privval.NewRemoteSigner(logger, *chainID, pv, dialer)
 	err := rs.Start()
 	if err != nil {
 		panic(err)
diff --git a/cmd/tendermint/commands/gen_validator.go b/cmd/tendermint/commands/gen_validator.go
index 20d43d4dd..572bc974f 100644
--- a/cmd/tendermint/commands/gen_validator.go
+++ b/cmd/tendermint/commands/gen_validator.go
@@ -17,7 +17,7 @@ var GenValidatorCmd = &cobra.Command{
 }
 
 func genValidator(cmd *cobra.Command, args []string) {
-	pv := privval.GenFilePV("")
+	pv := privval.GenFilePV("", "")
 	jsbz, err := cdc.MarshalJSON(pv)
 	if err != nil {
 		panic(err)
diff --git a/cmd/tendermint/commands/init.go b/cmd/tendermint/commands/init.go
index 85ee44916..1d6e24d7d 100644
--- a/cmd/tendermint/commands/init.go
+++ b/cmd/tendermint/commands/init.go
@@ -4,7 +4,6 @@ import (
 	"fmt"
 
 	"github.com/spf13/cobra"
-
 	cfg "github.com/tendermint/tendermint/config"
 	cmn "github.com/tendermint/tendermint/libs/common"
 	"github.com/tendermint/tendermint/p2p"
@@ -26,15 +25,18 @@ func initFiles(cmd *cobra.Command, args []string) error {
 
 func initFilesWithConfig(config *cfg.Config) error {
 	// private validator
-	privValFile := config.PrivValidatorFile()
+	privValKeyFile := config.PrivValidatorKeyFile()
+	privValStateFile := config.PrivValidatorStateFile()
 	var pv *privval.FilePV
-	if cmn.FileExists(privValFile) {
-		pv = privval.LoadFilePV(privValFile)
-		logger.Info("Found private validator", "path", privValFile)
+	if cmn.FileExists(privValKeyFile) {
+		pv = privval.LoadFilePV(privValKeyFile, privValStateFile)
+		logger.Info("Found private validator", "keyFile", privValKeyFile,
+			"stateFile", privValStateFile)
 	} else {
-		pv = privval.GenFilePV(privValFile)
+		pv = privval.GenFilePV(privValKeyFile, privValStateFile)
 		pv.Save()
-		logger.Info("Generated private validator", "path", privValFile)
+		logger.Info("Generated private validator", "keyFile", privValKeyFile,
+			"stateFile", privValStateFile)
 	}
 
 	nodeKeyFile := config.NodeKeyFile()
@@ -57,9 +59,10 @@ func initFilesWithConfig(config *cfg.Config) error {
 			GenesisTime:     tmtime.Now(),
 			ConsensusParams: types.DefaultConsensusParams(),
 		}
+		key := pv.GetPubKey()
 		genDoc.Validators = []types.GenesisValidator{{
-			Address: pv.GetPubKey().Address(),
-			PubKey:  pv.GetPubKey(),
+			Address: key.Address(),
+			PubKey:  key,
 			Power:   10,
 		}}
 
diff --git a/cmd/tendermint/commands/reset_priv_validator.go b/cmd/tendermint/commands/reset_priv_validator.go
index 53d347129..122c2a725 100644
--- a/cmd/tendermint/commands/reset_priv_validator.go
+++ b/cmd/tendermint/commands/reset_priv_validator.go
@@ -5,6 +5,7 @@ import (
 
 	"github.com/spf13/cobra"
 
+	cmn "github.com/tendermint/tendermint/libs/common"
 	"github.com/tendermint/tendermint/libs/log"
 	"github.com/tendermint/tendermint/privval"
 )
@@ -27,36 +28,41 @@ var ResetPrivValidatorCmd = &cobra.Command{
 // XXX: this is totally unsafe.
 // it's only suitable for testnets.
 func resetAll(cmd *cobra.Command, args []string) {
-	ResetAll(config.DBDir(), config.P2P.AddrBookFile(), config.PrivValidatorFile(), logger)
+	ResetAll(config.DBDir(), config.P2P.AddrBookFile(), config.PrivValidatorKeyFile(),
+		config.PrivValidatorStateFile(), logger)
 }
 
 // XXX: this is totally unsafe.
 // it's only suitable for testnets.
 func resetPrivValidator(cmd *cobra.Command, args []string) {
-	resetFilePV(config.PrivValidatorFile(), logger)
+	resetFilePV(config.PrivValidatorKeyFile(), config.PrivValidatorStateFile(), logger)
 }
 
-// ResetAll removes the privValidator and address book files plus all data.
+// ResetAll removes address book files plus all data, and resets the privValdiator data.
 // Exported so other CLI tools can use it.
-func ResetAll(dbDir, addrBookFile, privValFile string, logger log.Logger) {
-	resetFilePV(privValFile, logger)
+func ResetAll(dbDir, addrBookFile, privValKeyFile, privValStateFile string, logger log.Logger) {
 	removeAddrBook(addrBookFile, logger)
 	if err := os.RemoveAll(dbDir); err == nil {
 		logger.Info("Removed all blockchain history", "dir", dbDir)
 	} else {
 		logger.Error("Error removing all blockchain history", "dir", dbDir, "err", err)
 	}
+	// recreate the dbDir since the privVal state needs to live there
+	cmn.EnsureDir(dbDir, 0700)
+	resetFilePV(privValKeyFile, privValStateFile, logger)
 }
 
-func resetFilePV(privValFile string, logger log.Logger) {
-	if _, err := os.Stat(privValFile); err == nil {
-		pv := privval.LoadFilePV(privValFile)
+func resetFilePV(privValKeyFile, privValStateFile string, logger log.Logger) {
+	if _, err := os.Stat(privValKeyFile); err == nil {
+		pv := privval.LoadFilePVEmptyState(privValKeyFile, privValStateFile)
 		pv.Reset()
-		logger.Info("Reset private validator file to genesis state", "file", privValFile)
+		logger.Info("Reset private validator file to genesis state", "keyFile", privValKeyFile,
+			"stateFile", privValStateFile)
 	} else {
-		pv := privval.GenFilePV(privValFile)
+		pv := privval.GenFilePV(privValKeyFile, privValStateFile)
 		pv.Save()
-		logger.Info("Generated private validator file", "file", privValFile)
+		logger.Info("Generated private validator file", "file", "keyFile", privValKeyFile,
+			"stateFile", privValStateFile)
 	}
 }
 
diff --git a/cmd/tendermint/commands/run_node.go b/cmd/tendermint/commands/run_node.go
index 6dabacb1f..ef205aa6b 100644
--- a/cmd/tendermint/commands/run_node.go
+++ b/cmd/tendermint/commands/run_node.go
@@ -24,7 +24,7 @@ func AddNodeFlags(cmd *cobra.Command) {
 	cmd.Flags().Bool("fast_sync", config.FastSync, "Fast blockchain syncing")
 
 	// abci flags
-	cmd.Flags().String("proxy_app", config.ProxyApp, "Proxy app address, or 'nilapp' or 'kvstore' for local testing.")
+	cmd.Flags().String("proxy_app", config.ProxyApp, "Proxy app address, or one of: 'kvstore', 'persistent_kvstore', 'counter', 'counter_serial' or 'noop' for local testing.")
 	cmd.Flags().String("abci", config.ABCI, "Specify abci transport (socket | grpc)")
 
 	// rpc flags
diff --git a/cmd/tendermint/commands/show_validator.go b/cmd/tendermint/commands/show_validator.go
index 54765164b..78bc06034 100644
--- a/cmd/tendermint/commands/show_validator.go
+++ b/cmd/tendermint/commands/show_validator.go
@@ -16,7 +16,7 @@ var ShowValidatorCmd = &cobra.Command{
 }
 
 func showValidator(cmd *cobra.Command, args []string) {
-	privValidator := privval.LoadOrGenFilePV(config.PrivValidatorFile())
+	privValidator := privval.LoadOrGenFilePV(config.PrivValidatorKeyFile(), config.PrivValidatorStateFile())
 	pubKeyJSONBytes, _ := cdc.MarshalJSON(privValidator.GetPubKey())
 	fmt.Println(string(pubKeyJSONBytes))
 }
diff --git a/cmd/tendermint/commands/testnet.go b/cmd/tendermint/commands/testnet.go
index 7e5635ca6..c3ef86190 100644
--- a/cmd/tendermint/commands/testnet.go
+++ b/cmd/tendermint/commands/testnet.go
@@ -85,11 +85,18 @@ func testnetFiles(cmd *cobra.Command, args []string) error {
 			_ = os.RemoveAll(outputDir)
 			return err
 		}
+		err = os.MkdirAll(filepath.Join(nodeDir, "data"), nodeDirPerm)
+		if err != nil {
+			_ = os.RemoveAll(outputDir)
+			return err
+		}
 
 		initFilesWithConfig(config)
 
-		pvFile := filepath.Join(nodeDir, config.BaseConfig.PrivValidator)
-		pv := privval.LoadFilePV(pvFile)
+		pvKeyFile := filepath.Join(nodeDir, config.BaseConfig.PrivValidatorKey)
+		pvStateFile := filepath.Join(nodeDir, config.BaseConfig.PrivValidatorState)
+
+		pv := privval.LoadFilePV(pvKeyFile, pvStateFile)
 		genVals[i] = types.GenesisValidator{
 			Address: pv.GetPubKey().Address(),
 			PubKey:  pv.GetPubKey(),
@@ -145,6 +152,7 @@ func testnetFiles(cmd *cobra.Command, args []string) error {
 		nodeDir := filepath.Join(outputDir, fmt.Sprintf("%s%d", nodeDirPrefix, i))
 		config.SetRoot(nodeDir)
 		config.P2P.AddrBookStrict = false
+		config.P2P.AllowDuplicateIP = true
 		if populatePersistentPeers {
 			config.P2P.PersistentPeers = persistentPeers
 		}
diff --git a/config/config.go b/config/config.go
index 2b9c8758a..fc50d7c61 100644
--- a/config/config.go
+++ b/config/config.go
@@ -35,15 +35,24 @@ var (
 	defaultConfigFileName  = "config.toml"
 	defaultGenesisJSONName = "genesis.json"
 
-	defaultPrivValName  = "priv_validator.json"
+	defaultPrivValKeyName   = "priv_validator_key.json"
+	defaultPrivValStateName = "priv_validator_state.json"
+
 	defaultNodeKeyName  = "node_key.json"
 	defaultAddrBookName = "addrbook.json"
 
-	defaultConfigFilePath  = filepath.Join(defaultConfigDir, defaultConfigFileName)
-	defaultGenesisJSONPath = filepath.Join(defaultConfigDir, defaultGenesisJSONName)
-	defaultPrivValPath     = filepath.Join(defaultConfigDir, defaultPrivValName)
-	defaultNodeKeyPath     = filepath.Join(defaultConfigDir, defaultNodeKeyName)
-	defaultAddrBookPath    = filepath.Join(defaultConfigDir, defaultAddrBookName)
+	defaultConfigFilePath   = filepath.Join(defaultConfigDir, defaultConfigFileName)
+	defaultGenesisJSONPath  = filepath.Join(defaultConfigDir, defaultGenesisJSONName)
+	defaultPrivValKeyPath   = filepath.Join(defaultConfigDir, defaultPrivValKeyName)
+	defaultPrivValStatePath = filepath.Join(defaultDataDir, defaultPrivValStateName)
+
+	defaultNodeKeyPath  = filepath.Join(defaultConfigDir, defaultNodeKeyName)
+	defaultAddrBookPath = filepath.Join(defaultConfigDir, defaultAddrBookName)
+)
+
+var (
+	oldPrivVal     = "priv_validator.json"
+	oldPrivValPath = filepath.Join(defaultConfigDir, oldPrivVal)
 )
 
 // Config defines the top level configuration for a Tendermint node
@@ -160,7 +169,10 @@ type BaseConfig struct {
 	Genesis string `mapstructure:"genesis_file"`
 
 	// Path to the JSON file containing the private key to use as a validator in the consensus protocol
-	PrivValidator string `mapstructure:"priv_validator_file"`
+	PrivValidatorKey string `mapstructure:"priv_validator_key_file"`
+
+	// Path to the JSON file containing the last sign state of a validator
+	PrivValidatorState string `mapstructure:"priv_validator_state_file"`
 
 	// TCP or UNIX socket address for Tendermint to listen on for
 	// connections from an external PrivValidator process
@@ -183,19 +195,20 @@ type BaseConfig struct {
 // DefaultBaseConfig returns a default base configuration for a Tendermint node
 func DefaultBaseConfig() BaseConfig {
 	return BaseConfig{
-		Genesis:           defaultGenesisJSONPath,
-		PrivValidator:     defaultPrivValPath,
-		NodeKey:           defaultNodeKeyPath,
-		Moniker:           defaultMoniker,
-		ProxyApp:          "tcp://127.0.0.1:26658",
-		ABCI:              "socket",
-		LogLevel:          DefaultPackageLogLevels(),
-		LogFormat:         LogFormatPlain,
-		ProfListenAddress: "",
-		FastSync:          true,
-		FilterPeers:       false,
-		DBBackend:         "leveldb",
-		DBPath:            "data",
+		Genesis:            defaultGenesisJSONPath,
+		PrivValidatorKey:   defaultPrivValKeyPath,
+		PrivValidatorState: defaultPrivValStatePath,
+		NodeKey:            defaultNodeKeyPath,
+		Moniker:            defaultMoniker,
+		ProxyApp:           "tcp://127.0.0.1:26658",
+		ABCI:               "socket",
+		LogLevel:           DefaultPackageLogLevels(),
+		LogFormat:          LogFormatPlain,
+		ProfListenAddress:  "",
+		FastSync:           true,
+		FilterPeers:        false,
+		DBBackend:          "leveldb",
+		DBPath:             "data",
 	}
 }
 
@@ -218,9 +231,20 @@ func (cfg BaseConfig) GenesisFile() string {
 	return rootify(cfg.Genesis, cfg.RootDir)
 }
 
-// PrivValidatorFile returns the full path to the priv_validator.json file
-func (cfg BaseConfig) PrivValidatorFile() string {
-	return rootify(cfg.PrivValidator, cfg.RootDir)
+// PrivValidatorKeyFile returns the full path to the priv_validator_key.json file
+func (cfg BaseConfig) PrivValidatorKeyFile() string {
+	return rootify(cfg.PrivValidatorKey, cfg.RootDir)
+}
+
+// PrivValidatorFile returns the full path to the priv_validator_state.json file
+func (cfg BaseConfig) PrivValidatorStateFile() string {
+	return rootify(cfg.PrivValidatorState, cfg.RootDir)
+}
+
+// OldPrivValidatorFile returns the full path of the priv_validator.json from pre v0.28.0.
+// TODO: eventually remove.
+func (cfg BaseConfig) OldPrivValidatorFile() string {
+	return rootify(oldPrivValPath, cfg.RootDir)
 }
 
 // NodeKeyFile returns the full path to the node_key.json file
@@ -434,7 +458,7 @@ func DefaultP2PConfig() *P2PConfig {
 		RecvRate:                5120000, // 5 mB/s
 		PexReactor:              true,
 		SeedMode:                false,
-		AllowDuplicateIP:        true, // so non-breaking yet
+		AllowDuplicateIP:        false,
 		HandshakeTimeout:        20 * time.Second,
 		DialTimeout:             3 * time.Second,
 		TestDialFail:            false,
diff --git a/config/toml.go b/config/toml.go
index 9aa30451d..79ae99beb 100644
--- a/config/toml.go
+++ b/config/toml.go
@@ -95,7 +95,10 @@ log_format = "{{ .BaseConfig.LogFormat }}"
 genesis_file = "{{ js .BaseConfig.Genesis }}"
 
 # Path to the JSON file containing the private key to use as a validator in the consensus protocol
-priv_validator_file = "{{ js .BaseConfig.PrivValidator }}"
+priv_validator_key_file = "{{ js .BaseConfig.PrivValidatorKey }}"
+
+# Path to the JSON file containing the last sign state of a validator
+priv_validator_state_file = "{{ js .BaseConfig.PrivValidatorState }}"
 
 # TCP or UNIX socket address for Tendermint to listen on for
 # connections from an external PrivValidator process
@@ -342,7 +345,8 @@ func ResetTestRoot(testName string) *Config {
 	baseConfig := DefaultBaseConfig()
 	configFilePath := filepath.Join(rootDir, defaultConfigFilePath)
 	genesisFilePath := filepath.Join(rootDir, baseConfig.Genesis)
-	privFilePath := filepath.Join(rootDir, baseConfig.PrivValidator)
+	privKeyFilePath := filepath.Join(rootDir, baseConfig.PrivValidatorKey)
+	privStateFilePath := filepath.Join(rootDir, baseConfig.PrivValidatorState)
 
 	// Write default config file if missing.
 	if !cmn.FileExists(configFilePath) {
@@ -352,7 +356,8 @@ func ResetTestRoot(testName string) *Config {
 		cmn.MustWriteFile(genesisFilePath, []byte(testGenesis), 0644)
 	}
 	// we always overwrite the priv val
-	cmn.MustWriteFile(privFilePath, []byte(testPrivValidator), 0644)
+	cmn.MustWriteFile(privKeyFilePath, []byte(testPrivValidatorKey), 0644)
+	cmn.MustWriteFile(privStateFilePath, []byte(testPrivValidatorState), 0644)
 
 	config := TestConfig().SetRoot(rootDir)
 	return config
@@ -374,7 +379,7 @@ var testGenesis = `{
   "app_hash": ""
 }`
 
-var testPrivValidator = `{
+var testPrivValidatorKey = `{
   "address": "A3258DCBF45DCA0DF052981870F2D1441A36D145",
   "pub_key": {
     "type": "tendermint/PubKeyEd25519",
@@ -383,8 +388,11 @@ var testPrivValidator = `{
   "priv_key": {
     "type": "tendermint/PrivKeyEd25519",
     "value": "EVkqJO/jIXp3rkASXfh9YnyToYXRXhBr6g9cQVxPFnQBP/5povV4HTjvsy530kybxKHwEi85iU8YL0qQhSYVoQ=="
-  },
-  "last_height": "0",
-  "last_round": "0",
-  "last_step": 0
+  }
+}`
+
+var testPrivValidatorState = `{
+  "height": "0",
+  "round": "0",
+  "step": 0
 }`
diff --git a/config/toml_test.go b/config/toml_test.go
index a1637f671..59528db16 100644
--- a/config/toml_test.go
+++ b/config/toml_test.go
@@ -60,7 +60,7 @@ func TestEnsureTestRoot(t *testing.T) {
 
 	// TODO: make sure the cfg returned and testconfig are the same!
 	baseConfig := DefaultBaseConfig()
-	ensureFiles(t, rootDir, defaultDataDir, baseConfig.Genesis, baseConfig.PrivValidator)
+	ensureFiles(t, rootDir, defaultDataDir, baseConfig.Genesis, baseConfig.PrivValidatorKey, baseConfig.PrivValidatorState)
 }
 
 func checkConfig(configFile string) bool {
diff --git a/consensus/common_test.go b/consensus/common_test.go
index 46be5cbd7..a975b2b60 100644
--- a/consensus/common_test.go
+++ b/consensus/common_test.go
@@ -6,14 +6,18 @@ import (
 	"fmt"
 	"io/ioutil"
 	"os"
-	"path"
+	"path/filepath"
 	"reflect"
 	"sort"
 	"sync"
 	"testing"
 	"time"
 
+	"github.com/go-kit/kit/log/term"
+
 	abcicli "github.com/tendermint/tendermint/abci/client"
+	"github.com/tendermint/tendermint/abci/example/counter"
+	"github.com/tendermint/tendermint/abci/example/kvstore"
 	abci "github.com/tendermint/tendermint/abci/types"
 	bc "github.com/tendermint/tendermint/blockchain"
 	cfg "github.com/tendermint/tendermint/config"
@@ -27,11 +31,6 @@ import (
 	sm "github.com/tendermint/tendermint/state"
 	"github.com/tendermint/tendermint/types"
 	tmtime "github.com/tendermint/tendermint/types/time"
-
-	"github.com/tendermint/tendermint/abci/example/counter"
-	"github.com/tendermint/tendermint/abci/example/kvstore"
-
-	"github.com/go-kit/kit/log/term"
 )
 
 const (
@@ -72,9 +71,10 @@ func NewValidatorStub(privValidator types.PrivValidator, valIndex int) *validato
 }
 
 func (vs *validatorStub) signVote(voteType types.SignedMsgType, hash []byte, header types.PartSetHeader) (*types.Vote, error) {
+	addr := vs.PrivValidator.GetPubKey().Address()
 	vote := &types.Vote{
 		ValidatorIndex:   vs.Index,
-		ValidatorAddress: vs.PrivValidator.GetAddress(),
+		ValidatorAddress: addr,
 		Height:           vs.Height,
 		Round:            vs.Round,
 		Timestamp:        tmtime.Now(),
@@ -151,8 +151,9 @@ func signAddVotes(to *ConsensusState, voteType types.SignedMsgType, hash []byte,
 
 func validatePrevote(t *testing.T, cs *ConsensusState, round int, privVal *validatorStub, blockHash []byte) {
 	prevotes := cs.Votes.Prevotes(round)
+	address := privVal.GetPubKey().Address()
 	var vote *types.Vote
-	if vote = prevotes.GetByAddress(privVal.GetAddress()); vote == nil {
+	if vote = prevotes.GetByAddress(address); vote == nil {
 		panic("Failed to find prevote from validator")
 	}
 	if blockHash == nil {
@@ -168,8 +169,9 @@ func validatePrevote(t *testing.T, cs *ConsensusState, round int, privVal *valid
 
 func validateLastPrecommit(t *testing.T, cs *ConsensusState, privVal *validatorStub, blockHash []byte) {
 	votes := cs.LastCommit
+	address := privVal.GetPubKey().Address()
 	var vote *types.Vote
-	if vote = votes.GetByAddress(privVal.GetAddress()); vote == nil {
+	if vote = votes.GetByAddress(address); vote == nil {
 		panic("Failed to find precommit from validator")
 	}
 	if !bytes.Equal(vote.BlockID.Hash, blockHash) {
@@ -179,8 +181,9 @@ func validateLastPrecommit(t *testing.T, cs *ConsensusState, privVal *validatorS
 
 func validatePrecommit(t *testing.T, cs *ConsensusState, thisRound, lockRound int, privVal *validatorStub, votedBlockHash, lockedBlockHash []byte) {
 	precommits := cs.Votes.Precommits(thisRound)
+	address := privVal.GetPubKey().Address()
 	var vote *types.Vote
-	if vote = precommits.GetByAddress(privVal.GetAddress()); vote == nil {
+	if vote = precommits.GetByAddress(address); vote == nil {
 		panic("Failed to find precommit from validator")
 	}
 
@@ -281,9 +284,10 @@ func newConsensusStateWithConfigAndBlockStore(thisConfig *cfg.Config, state sm.S
 }
 
 func loadPrivValidator(config *cfg.Config) *privval.FilePV {
-	privValidatorFile := config.PrivValidatorFile()
-	ensureDir(path.Dir(privValidatorFile), 0700)
-	privValidator := privval.LoadOrGenFilePV(privValidatorFile)
+	privValidatorKeyFile := config.PrivValidatorKeyFile()
+	ensureDir(filepath.Dir(privValidatorKeyFile), 0700)
+	privValidatorStateFile := config.PrivValidatorStateFile()
+	privValidator := privval.LoadOrGenFilePV(privValidatorKeyFile, privValidatorStateFile)
 	privValidator.Reset()
 	return privValidator
 }
@@ -591,7 +595,7 @@ func randConsensusNet(nValidators int, testName string, tickerFunc func() Timeou
 		for _, opt := range configOpts {
 			opt(thisConfig)
 		}
-		ensureDir(path.Dir(thisConfig.Consensus.WalFile()), 0700) // dir for wal
+		ensureDir(filepath.Dir(thisConfig.Consensus.WalFile()), 0700) // dir for wal
 		app := appFunc()
 		vals := types.TM2PB.ValidatorUpdates(state.Validators)
 		app.InitChain(abci.RequestInitChain{Validators: vals})
@@ -612,16 +616,21 @@ func randConsensusNetWithPeers(nValidators, nPeers int, testName string, tickerF
 		stateDB := dbm.NewMemDB() // each state needs its own db
 		state, _ := sm.LoadStateFromDBOrGenesisDoc(stateDB, genDoc)
 		thisConfig := ResetConfig(fmt.Sprintf("%s_%d", testName, i))
-		ensureDir(path.Dir(thisConfig.Consensus.WalFile()), 0700) // dir for wal
+		ensureDir(filepath.Dir(thisConfig.Consensus.WalFile()), 0700) // dir for wal
 		var privVal types.PrivValidator
 		if i < nValidators {
 			privVal = privVals[i]
 		} else {
-			tempFile, err := ioutil.TempFile("", "priv_validator_")
+			tempKeyFile, err := ioutil.TempFile("", "priv_validator_key_")
+			if err != nil {
+				panic(err)
+			}
+			tempStateFile, err := ioutil.TempFile("", "priv_validator_state_")
 			if err != nil {
 				panic(err)
 			}
-			privVal = privval.GenFilePV(tempFile.Name())
+
+			privVal = privval.GenFilePV(tempKeyFile.Name(), tempStateFile.Name())
 		}
 
 		app := appFunc()
diff --git a/consensus/reactor_test.go b/consensus/reactor_test.go
index 1636785c0..5334895f4 100644
--- a/consensus/reactor_test.go
+++ b/consensus/reactor_test.go
@@ -143,7 +143,8 @@ func TestReactorWithEvidence(t *testing.T) {
 		// mock the evidence pool
 		// everyone includes evidence of another double signing
 		vIdx := (i + 1) % nValidators
-		evpool := newMockEvidencePool(privVals[vIdx].GetAddress())
+		addr := privVals[vIdx].GetPubKey().Address()
+		evpool := newMockEvidencePool(addr)
 
 		// Make ConsensusState
 		blockExec := sm.NewBlockExecutor(stateDB, log.TestingLogger(), proxyAppConnCon, mempool, evpool)
@@ -268,7 +269,8 @@ func TestReactorVotingPowerChange(t *testing.T) {
 	// map of active validators
 	activeVals := make(map[string]struct{})
 	for i := 0; i < nVals; i++ {
-		activeVals[string(css[i].privValidator.GetAddress())] = struct{}{}
+		addr := css[i].privValidator.GetPubKey().Address()
+		activeVals[string(addr)] = struct{}{}
 	}
 
 	// wait till everyone makes block 1
@@ -331,7 +333,8 @@ func TestReactorValidatorSetChanges(t *testing.T) {
 	// map of active validators
 	activeVals := make(map[string]struct{})
 	for i := 0; i < nVals; i++ {
-		activeVals[string(css[i].privValidator.GetAddress())] = struct{}{}
+		addr := css[i].privValidator.GetPubKey().Address()
+		activeVals[string(addr)] = struct{}{}
 	}
 
 	// wait till everyone makes block 1
diff --git a/consensus/replay_test.go b/consensus/replay_test.go
index 7cd32c7aa..7c00251e8 100644
--- a/consensus/replay_test.go
+++ b/consensus/replay_test.go
@@ -319,7 +319,7 @@ func testHandshakeReplay(t *testing.T, nBlocks int, mode uint) {
 	walFile := tempWALWithData(walBody)
 	config.Consensus.SetWalFile(walFile)
 
-	privVal := privval.LoadFilePV(config.PrivValidatorFile())
+	privVal := privval.LoadFilePV(config.PrivValidatorKeyFile(), config.PrivValidatorStateFile())
 
 	wal, err := NewWAL(walFile)
 	require.NoError(t, err)
@@ -633,7 +633,7 @@ func TestInitChainUpdateValidators(t *testing.T) {
 	clientCreator := proxy.NewLocalClientCreator(app)
 
 	config := ResetConfig("proxy_test_")
-	privVal := privval.LoadFilePV(config.PrivValidatorFile())
+	privVal := privval.LoadFilePV(config.PrivValidatorKeyFile(), config.PrivValidatorStateFile())
 	stateDB, state, store := stateAndStore(config, privVal.GetPubKey(), 0x0)
 
 	oldValAddr := state.Validators.Validators[0].Address
@@ -659,12 +659,6 @@ func TestInitChainUpdateValidators(t *testing.T) {
 	assert.Equal(t, newValAddr, expectValAddr)
 }
 
-func newInitChainApp(vals []abci.ValidatorUpdate) *initChainApp {
-	return &initChainApp{
-		vals: vals,
-	}
-}
-
 // returns the vals on InitChain
 type initChainApp struct {
 	abci.BaseApplication
diff --git a/consensus/state.go b/consensus/state.go
index 81bdce7d3..c6f73d352 100644
--- a/consensus/state.go
+++ b/consensus/state.go
@@ -2,13 +2,14 @@ package consensus
 
 import (
 	"bytes"
-	"errors"
 	"fmt"
 	"reflect"
 	"runtime/debug"
 	"sync"
 	"time"
 
+	"github.com/pkg/errors"
+
 	cmn "github.com/tendermint/tendermint/libs/common"
 	"github.com/tendermint/tendermint/libs/fail"
 	"github.com/tendermint/tendermint/libs/log"
@@ -829,13 +830,14 @@ func (cs *ConsensusState) enterPropose(height int64, round int) {
 	}
 
 	// if not a validator, we're done
-	if !cs.Validators.HasAddress(cs.privValidator.GetAddress()) {
-		logger.Debug("This node is not a validator", "addr", cs.privValidator.GetAddress(), "vals", cs.Validators)
+	address := cs.privValidator.GetPubKey().Address()
+	if !cs.Validators.HasAddress(address) {
+		logger.Debug("This node is not a validator", "addr", address, "vals", cs.Validators)
 		return
 	}
 	logger.Debug("This node is a validator")
 
-	if cs.isProposer() {
+	if cs.isProposer(address) {
 		logger.Info("enterPropose: Our turn to propose", "proposer", cs.Validators.GetProposer().Address, "privValidator", cs.privValidator)
 		cs.decideProposal(height, round)
 	} else {
@@ -843,8 +845,8 @@ func (cs *ConsensusState) enterPropose(height int64, round int) {
 	}
 }
 
-func (cs *ConsensusState) isProposer() bool {
-	return bytes.Equal(cs.Validators.GetProposer().Address, cs.privValidator.GetAddress())
+func (cs *ConsensusState) isProposer(address []byte) bool {
+	return bytes.Equal(cs.Validators.GetProposer().Address, address)
 }
 
 func (cs *ConsensusState) defaultDecideProposal(height int64, round int) {
@@ -929,7 +931,7 @@ func (cs *ConsensusState) createProposalBlock() (block *types.Block, blockParts
 		cs.state.Validators.Size(),
 		len(evidence),
 	), maxGas)
-	proposerAddr := cs.privValidator.GetAddress()
+	proposerAddr := cs.privValidator.GetPubKey().Address()
 	block, parts := cs.state.MakeBlock(cs.Height, txs, commit, evidence, proposerAddr)
 
 	return block, parts
@@ -1474,7 +1476,8 @@ func (cs *ConsensusState) tryAddVote(vote *types.Vote, peerID p2p.ID) (bool, err
 		if err == ErrVoteHeightMismatch {
 			return added, err
 		} else if voteErr, ok := err.(*types.ErrVoteConflictingVotes); ok {
-			if bytes.Equal(vote.ValidatorAddress, cs.privValidator.GetAddress()) {
+			addr := cs.privValidator.GetPubKey().Address()
+			if bytes.Equal(vote.ValidatorAddress, addr) {
 				cs.Logger.Error("Found conflicting vote from ourselves. Did you unsafe_reset a validator?", "height", vote.Height, "round", vote.Round, "type", vote.Type)
 				return added, err
 			}
@@ -1526,7 +1529,7 @@ func (cs *ConsensusState) addVote(vote *types.Vote, peerID p2p.ID) (added bool,
 	// Not necessarily a bad peer, but not favourable behaviour.
 	if vote.Height != cs.Height {
 		err = ErrVoteHeightMismatch
-		cs.Logger.Info("Vote ignored and not added", "voteHeight", vote.Height, "csHeight", cs.Height, "err", err)
+		cs.Logger.Info("Vote ignored and not added", "voteHeight", vote.Height, "csHeight", cs.Height, "peerID", peerID)
 		return
 	}
 
@@ -1639,7 +1642,7 @@ func (cs *ConsensusState) addVote(vote *types.Vote, peerID p2p.ID) (added bool,
 }
 
 func (cs *ConsensusState) signVote(type_ types.SignedMsgType, hash []byte, header types.PartSetHeader) (*types.Vote, error) {
-	addr := cs.privValidator.GetAddress()
+	addr := cs.privValidator.GetPubKey().Address()
 	valIndex, _ := cs.Validators.GetByAddress(addr)
 
 	vote := &types.Vote{
@@ -1675,7 +1678,7 @@ func (cs *ConsensusState) voteTime() time.Time {
 // sign the vote and publish on internalMsgQueue
 func (cs *ConsensusState) signAddVote(type_ types.SignedMsgType, hash []byte, header types.PartSetHeader) *types.Vote {
 	// if we don't have a key or we're not in the validator set, do nothing
-	if cs.privValidator == nil || !cs.Validators.HasAddress(cs.privValidator.GetAddress()) {
+	if cs.privValidator == nil || !cs.Validators.HasAddress(cs.privValidator.GetPubKey().Address()) {
 		return nil
 	}
 	vote, err := cs.signVote(type_, hash, header)
diff --git a/consensus/state_test.go b/consensus/state_test.go
index ddab6404a..40103e472 100644
--- a/consensus/state_test.go
+++ b/consensus/state_test.go
@@ -73,7 +73,8 @@ func TestStateProposerSelection0(t *testing.T) {
 
 	// Commit a block and ensure proposer for the next height is correct.
 	prop := cs1.GetRoundState().Validators.GetProposer()
-	if !bytes.Equal(prop.Address, cs1.privValidator.GetAddress()) {
+	address := cs1.privValidator.GetPubKey().Address()
+	if !bytes.Equal(prop.Address, address) {
 		t.Fatalf("expected proposer to be validator %d. Got %X", 0, prop.Address)
 	}
 
@@ -87,7 +88,8 @@ func TestStateProposerSelection0(t *testing.T) {
 	ensureNewRound(newRoundCh, height+1, 0)
 
 	prop = cs1.GetRoundState().Validators.GetProposer()
-	if !bytes.Equal(prop.Address, vss[1].GetAddress()) {
+	addr := vss[1].GetPubKey().Address()
+	if !bytes.Equal(prop.Address, addr) {
 		panic(fmt.Sprintf("expected proposer to be validator %d. Got %X", 1, prop.Address))
 	}
 }
@@ -110,7 +112,8 @@ func TestStateProposerSelection2(t *testing.T) {
 	// everyone just votes nil. we get a new proposer each round
 	for i := 0; i < len(vss); i++ {
 		prop := cs1.GetRoundState().Validators.GetProposer()
-		correctProposer := vss[(i+round)%len(vss)].GetAddress()
+		addr := vss[(i+round)%len(vss)].GetPubKey().Address()
+		correctProposer := addr
 		if !bytes.Equal(prop.Address, correctProposer) {
 			panic(fmt.Sprintf("expected RoundState.Validators.GetProposer() to be validator %d. Got %X", (i+2)%len(vss), prop.Address))
 		}
@@ -505,7 +508,8 @@ func TestStateLockPOLRelock(t *testing.T) {
 
 	timeoutWaitCh := subscribe(cs1.eventBus, types.EventQueryTimeoutWait)
 	proposalCh := subscribe(cs1.eventBus, types.EventQueryCompleteProposal)
-	voteCh := subscribeToVoter(cs1, cs1.privValidator.GetAddress())
+	addr := cs1.privValidator.GetPubKey().Address()
+	voteCh := subscribeToVoter(cs1, addr)
 	newRoundCh := subscribe(cs1.eventBus, types.EventQueryNewRound)
 	newBlockCh := subscribe(cs1.eventBus, types.EventQueryNewBlockHeader)
 
@@ -596,7 +600,8 @@ func TestStateLockPOLUnlock(t *testing.T) {
 	timeoutWaitCh := subscribe(cs1.eventBus, types.EventQueryTimeoutWait)
 	newRoundCh := subscribe(cs1.eventBus, types.EventQueryNewRound)
 	unlockCh := subscribe(cs1.eventBus, types.EventQueryUnlock)
-	voteCh := subscribeToVoter(cs1, cs1.privValidator.GetAddress())
+	addr := cs1.privValidator.GetPubKey().Address()
+	voteCh := subscribeToVoter(cs1, addr)
 
 	// everything done from perspective of cs1
 
@@ -689,7 +694,8 @@ func TestStateLockPOLSafety1(t *testing.T) {
 	timeoutProposeCh := subscribe(cs1.eventBus, types.EventQueryTimeoutPropose)
 	timeoutWaitCh := subscribe(cs1.eventBus, types.EventQueryTimeoutWait)
 	newRoundCh := subscribe(cs1.eventBus, types.EventQueryNewRound)
-	voteCh := subscribeToVoter(cs1, cs1.privValidator.GetAddress())
+	addr := cs1.privValidator.GetPubKey().Address()
+	voteCh := subscribeToVoter(cs1, addr)
 
 	// start round and wait for propose and prevote
 	startTestRound(cs1, cs1.Height, round)
@@ -805,7 +811,8 @@ func TestStateLockPOLSafety2(t *testing.T) {
 	timeoutWaitCh := subscribe(cs1.eventBus, types.EventQueryTimeoutWait)
 	newRoundCh := subscribe(cs1.eventBus, types.EventQueryNewRound)
 	unlockCh := subscribe(cs1.eventBus, types.EventQueryUnlock)
-	voteCh := subscribeToVoter(cs1, cs1.privValidator.GetAddress())
+	addr := cs1.privValidator.GetPubKey().Address()
+	voteCh := subscribeToVoter(cs1, addr)
 
 	// the block for R0: gets polkad but we miss it
 	// (even though we signed it, shhh)
@@ -896,7 +903,8 @@ func TestProposeValidBlock(t *testing.T) {
 	timeoutProposeCh := subscribe(cs1.eventBus, types.EventQueryTimeoutPropose)
 	newRoundCh := subscribe(cs1.eventBus, types.EventQueryNewRound)
 	unlockCh := subscribe(cs1.eventBus, types.EventQueryUnlock)
-	voteCh := subscribeToVoter(cs1, cs1.privValidator.GetAddress())
+	addr := cs1.privValidator.GetPubKey().Address()
+	voteCh := subscribeToVoter(cs1, addr)
 
 	// start round and wait for propose and prevote
 	startTestRound(cs1, cs1.Height, round)
@@ -982,7 +990,8 @@ func TestSetValidBlockOnDelayedPrevote(t *testing.T) {
 	timeoutWaitCh := subscribe(cs1.eventBus, types.EventQueryTimeoutWait)
 	newRoundCh := subscribe(cs1.eventBus, types.EventQueryNewRound)
 	validBlockCh := subscribe(cs1.eventBus, types.EventQueryValidBlock)
-	voteCh := subscribeToVoter(cs1, cs1.privValidator.GetAddress())
+	addr := cs1.privValidator.GetPubKey().Address()
+	voteCh := subscribeToVoter(cs1, addr)
 
 	// start round and wait for propose and prevote
 	startTestRound(cs1, cs1.Height, round)
@@ -1041,7 +1050,8 @@ func TestSetValidBlockOnDelayedProposal(t *testing.T) {
 	timeoutProposeCh := subscribe(cs1.eventBus, types.EventQueryTimeoutPropose)
 	newRoundCh := subscribe(cs1.eventBus, types.EventQueryNewRound)
 	validBlockCh := subscribe(cs1.eventBus, types.EventQueryValidBlock)
-	voteCh := subscribeToVoter(cs1, cs1.privValidator.GetAddress())
+	addr := cs1.privValidator.GetPubKey().Address()
+	voteCh := subscribeToVoter(cs1, addr)
 	proposalCh := subscribe(cs1.eventBus, types.EventQueryCompleteProposal)
 
 	round = round + 1 // move to round in which P0 is not proposer
@@ -1111,7 +1121,8 @@ func TestWaitingTimeoutProposeOnNewRound(t *testing.T) {
 
 	timeoutWaitCh := subscribe(cs1.eventBus, types.EventQueryTimeoutPropose)
 	newRoundCh := subscribe(cs1.eventBus, types.EventQueryNewRound)
-	voteCh := subscribeToVoter(cs1, cs1.privValidator.GetAddress())
+	addr := cs1.privValidator.GetPubKey().Address()
+	voteCh := subscribeToVoter(cs1, addr)
 
 	// start round
 	startTestRound(cs1, height, round)
@@ -1144,7 +1155,8 @@ func TestRoundSkipOnNilPolkaFromHigherRound(t *testing.T) {
 
 	timeoutWaitCh := subscribe(cs1.eventBus, types.EventQueryTimeoutWait)
 	newRoundCh := subscribe(cs1.eventBus, types.EventQueryNewRound)
-	voteCh := subscribeToVoter(cs1, cs1.privValidator.GetAddress())
+	addr := cs1.privValidator.GetPubKey().Address()
+	voteCh := subscribeToVoter(cs1, addr)
 
 	// start round
 	startTestRound(cs1, height, round)
@@ -1177,7 +1189,8 @@ func TestWaitTimeoutProposeOnNilPolkaForTheCurrentRound(t *testing.T) {
 
 	timeoutProposeCh := subscribe(cs1.eventBus, types.EventQueryTimeoutPropose)
 	newRoundCh := subscribe(cs1.eventBus, types.EventQueryNewRound)
-	voteCh := subscribeToVoter(cs1, cs1.privValidator.GetAddress())
+	addr := cs1.privValidator.GetPubKey().Address()
+	voteCh := subscribeToVoter(cs1, addr)
 
 	// start round in which PO is not proposer
 	startTestRound(cs1, height, round)
@@ -1361,7 +1374,8 @@ func TestStateHalt1(t *testing.T) {
 	timeoutWaitCh := subscribe(cs1.eventBus, types.EventQueryTimeoutWait)
 	newRoundCh := subscribe(cs1.eventBus, types.EventQueryNewRound)
 	newBlockCh := subscribe(cs1.eventBus, types.EventQueryNewBlock)
-	voteCh := subscribeToVoter(cs1, cs1.privValidator.GetAddress())
+	addr := cs1.privValidator.GetPubKey().Address()
+	voteCh := subscribeToVoter(cs1, addr)
 
 	// start round and wait for propose and prevote
 	startTestRound(cs1, height, round)
diff --git a/consensus/types/height_vote_set_test.go b/consensus/types/height_vote_set_test.go
index e2298cef9..4460cd3ec 100644
--- a/consensus/types/height_vote_set_test.go
+++ b/consensus/types/height_vote_set_test.go
@@ -50,8 +50,9 @@ func TestPeerCatchupRounds(t *testing.T) {
 
 func makeVoteHR(t *testing.T, height int64, round int, privVals []types.PrivValidator, valIndex int) *types.Vote {
 	privVal := privVals[valIndex]
+	addr := privVal.GetPubKey().Address()
 	vote := &types.Vote{
-		ValidatorAddress: privVal.GetAddress(),
+		ValidatorAddress: addr,
 		ValidatorIndex:   valIndex,
 		Height:           height,
 		Round:            round,
diff --git a/consensus/wal_generator.go b/consensus/wal_generator.go
index 5ff597a52..83861d3ec 100644
--- a/consensus/wal_generator.go
+++ b/consensus/wal_generator.go
@@ -40,8 +40,9 @@ func WALGenerateNBlocks(wr io.Writer, numBlocks int) (err error) {
 	// COPY PASTE FROM node.go WITH A FEW MODIFICATIONS
 	// NOTE: we can't import node package because of circular dependency.
 	// NOTE: we don't do handshake so need to set state.Version.Consensus.App directly.
-	privValidatorFile := config.PrivValidatorFile()
-	privValidator := privval.LoadOrGenFilePV(privValidatorFile)
+	privValidatorKeyFile := config.PrivValidatorKeyFile()
+	privValidatorStateFile := config.PrivValidatorStateFile()
+	privValidator := privval.LoadOrGenFilePV(privValidatorKeyFile, privValidatorStateFile)
 	genDoc, err := types.GenesisDocFromFile(config.GenesisFile())
 	if err != nil {
 		return errors.Wrap(err, "failed to read genesis file")
diff --git a/crypto/ed25519/ed25519.go b/crypto/ed25519/ed25519.go
index 0c659e73f..bc60838d5 100644
--- a/crypto/ed25519/ed25519.go
+++ b/crypto/ed25519/ed25519.go
@@ -18,8 +18,8 @@ import (
 var _ crypto.PrivKey = PrivKeyEd25519{}
 
 const (
-	PrivKeyAminoRoute = "tendermint/PrivKeyEd25519"
-	PubKeyAminoRoute  = "tendermint/PubKeyEd25519"
+	PrivKeyAminoName = "tendermint/PrivKeyEd25519"
+	PubKeyAminoName  = "tendermint/PubKeyEd25519"
 	// Size of an Edwards25519 signature. Namely the size of a compressed
 	// Edwards25519 point, and a field element. Both of which are 32 bytes.
 	SignatureSize = 64
@@ -30,11 +30,11 @@ var cdc = amino.NewCodec()
 func init() {
 	cdc.RegisterInterface((*crypto.PubKey)(nil), nil)
 	cdc.RegisterConcrete(PubKeyEd25519{},
-		PubKeyAminoRoute, nil)
+		PubKeyAminoName, nil)
 
 	cdc.RegisterInterface((*crypto.PrivKey)(nil), nil)
 	cdc.RegisterConcrete(PrivKeyEd25519{},
-		PrivKeyAminoRoute, nil)
+		PrivKeyAminoName, nil)
 }
 
 // PrivKeyEd25519 implements crypto.PrivKey.
diff --git a/crypto/encoding/amino/amino.go b/crypto/encoding/amino/amino.go
index d66ecd9b1..f7be3a203 100644
--- a/crypto/encoding/amino/amino.go
+++ b/crypto/encoding/amino/amino.go
@@ -12,11 +12,11 @@ import (
 
 var cdc = amino.NewCodec()
 
-// routeTable is used to map public key concrete types back
-// to their amino routes. This should eventually be handled
+// nameTable is used to map public key concrete types back
+// to their registered amino names. This should eventually be handled
 // by amino. Example usage:
-// routeTable[reflect.TypeOf(ed25519.PubKeyEd25519{})] = ed25519.PubKeyAminoRoute
-var routeTable = make(map[reflect.Type]string, 3)
+// nameTable[reflect.TypeOf(ed25519.PubKeyEd25519{})] = ed25519.PubKeyAminoName
+var nameTable = make(map[reflect.Type]string, 3)
 
 func init() {
 	// NOTE: It's important that there be no conflicts here,
@@ -29,16 +29,16 @@ func init() {
 
 	// TODO: Have amino provide a way to go from concrete struct to route directly.
 	// Its currently a private API
-	routeTable[reflect.TypeOf(ed25519.PubKeyEd25519{})] = ed25519.PubKeyAminoRoute
-	routeTable[reflect.TypeOf(secp256k1.PubKeySecp256k1{})] = secp256k1.PubKeyAminoRoute
-	routeTable[reflect.TypeOf(&multisig.PubKeyMultisigThreshold{})] = multisig.PubKeyMultisigThresholdAminoRoute
+	nameTable[reflect.TypeOf(ed25519.PubKeyEd25519{})] = ed25519.PubKeyAminoName
+	nameTable[reflect.TypeOf(secp256k1.PubKeySecp256k1{})] = secp256k1.PubKeyAminoName
+	nameTable[reflect.TypeOf(multisig.PubKeyMultisigThreshold{})] = multisig.PubKeyMultisigThresholdAminoRoute
 }
 
-// PubkeyAminoRoute returns the amino route of a pubkey
+// PubkeyAminoName returns the amino route of a pubkey
 // cdc is currently passed in, as eventually this will not be using
 // a package level codec.
-func PubkeyAminoRoute(cdc *amino.Codec, key crypto.PubKey) (string, bool) {
-	route, found := routeTable[reflect.TypeOf(key)]
+func PubkeyAminoName(cdc *amino.Codec, key crypto.PubKey) (string, bool) {
+	route, found := nameTable[reflect.TypeOf(key)]
 	return route, found
 }
 
@@ -47,17 +47,17 @@ func RegisterAmino(cdc *amino.Codec) {
 	// These are all written here instead of
 	cdc.RegisterInterface((*crypto.PubKey)(nil), nil)
 	cdc.RegisterConcrete(ed25519.PubKeyEd25519{},
-		ed25519.PubKeyAminoRoute, nil)
+		ed25519.PubKeyAminoName, nil)
 	cdc.RegisterConcrete(secp256k1.PubKeySecp256k1{},
-		secp256k1.PubKeyAminoRoute, nil)
+		secp256k1.PubKeyAminoName, nil)
 	cdc.RegisterConcrete(multisig.PubKeyMultisigThreshold{},
 		multisig.PubKeyMultisigThresholdAminoRoute, nil)
 
 	cdc.RegisterInterface((*crypto.PrivKey)(nil), nil)
 	cdc.RegisterConcrete(ed25519.PrivKeyEd25519{},
-		ed25519.PrivKeyAminoRoute, nil)
+		ed25519.PrivKeyAminoName, nil)
 	cdc.RegisterConcrete(secp256k1.PrivKeySecp256k1{},
-		secp256k1.PrivKeyAminoRoute, nil)
+		secp256k1.PrivKeyAminoName, nil)
 }
 
 func PrivKeyFromBytes(privKeyBytes []byte) (privKey crypto.PrivKey, err error) {
diff --git a/crypto/encoding/amino/encode_test.go b/crypto/encoding/amino/encode_test.go
index 056dbec44..c8cb24136 100644
--- a/crypto/encoding/amino/encode_test.go
+++ b/crypto/encoding/amino/encode_test.go
@@ -128,18 +128,18 @@ func TestPubKeyInvalidDataProperReturnsEmpty(t *testing.T) {
 	require.Nil(t, pk)
 }
 
-func TestPubkeyAminoRoute(t *testing.T) {
+func TestPubkeyAminoName(t *testing.T) {
 	tests := []struct {
 		key   crypto.PubKey
 		want  string
 		found bool
 	}{
-		{ed25519.PubKeyEd25519{}, ed25519.PubKeyAminoRoute, true},
-		{secp256k1.PubKeySecp256k1{}, secp256k1.PubKeyAminoRoute, true},
-		{&multisig.PubKeyMultisigThreshold{}, multisig.PubKeyMultisigThresholdAminoRoute, true},
+		{ed25519.PubKeyEd25519{}, ed25519.PubKeyAminoName, true},
+		{secp256k1.PubKeySecp256k1{}, secp256k1.PubKeyAminoName, true},
+		{multisig.PubKeyMultisigThreshold{}, multisig.PubKeyMultisigThresholdAminoRoute, true},
 	}
 	for i, tc := range tests {
-		got, found := PubkeyAminoRoute(cdc, tc.key)
+		got, found := PubkeyAminoName(cdc, tc.key)
 		require.Equal(t, tc.found, found, "not equal on tc %d", i)
 		if tc.found {
 			require.Equal(t, tc.want, got, "not equal on tc %d", i)
diff --git a/crypto/multisig/threshold_pubkey.go b/crypto/multisig/threshold_pubkey.go
index ca8d42303..234d420f1 100644
--- a/crypto/multisig/threshold_pubkey.go
+++ b/crypto/multisig/threshold_pubkey.go
@@ -2,7 +2,6 @@ package multisig
 
 import (
 	"github.com/tendermint/tendermint/crypto"
-	"github.com/tendermint/tendermint/crypto/tmhash"
 )
 
 // PubKeyMultisigThreshold implements a K of N threshold multisig.
@@ -11,7 +10,7 @@ type PubKeyMultisigThreshold struct {
 	PubKeys []crypto.PubKey `json:"pubkeys"`
 }
 
-var _ crypto.PubKey = &PubKeyMultisigThreshold{}
+var _ crypto.PubKey = PubKeyMultisigThreshold{}
 
 // NewPubKeyMultisigThreshold returns a new PubKeyMultisigThreshold.
 // Panics if len(pubkeys) < k or 0 >= k.
@@ -22,7 +21,7 @@ func NewPubKeyMultisigThreshold(k int, pubkeys []crypto.PubKey) crypto.PubKey {
 	if len(pubkeys) < k {
 		panic("threshold k of n multisignature: len(pubkeys) < k")
 	}
-	return &PubKeyMultisigThreshold{uint(k), pubkeys}
+	return PubKeyMultisigThreshold{uint(k), pubkeys}
 }
 
 // VerifyBytes expects sig to be an amino encoded version of a MultiSignature.
@@ -31,8 +30,8 @@ func NewPubKeyMultisigThreshold(k int, pubkeys []crypto.PubKey) crypto.PubKey {
 // and all signatures are valid. (Not just k of the signatures)
 // The multisig uses a bitarray, so multiple signatures for the same key is not
 // a concern.
-func (pk *PubKeyMultisigThreshold) VerifyBytes(msg []byte, marshalledSig []byte) bool {
-	var sig *Multisignature
+func (pk PubKeyMultisigThreshold) VerifyBytes(msg []byte, marshalledSig []byte) bool {
+	var sig Multisignature
 	err := cdc.UnmarshalBinaryBare(marshalledSig, &sig)
 	if err != nil {
 		return false
@@ -64,19 +63,19 @@ func (pk *PubKeyMultisigThreshold) VerifyBytes(msg []byte, marshalledSig []byte)
 }
 
 // Bytes returns the amino encoded version of the PubKeyMultisigThreshold
-func (pk *PubKeyMultisigThreshold) Bytes() []byte {
+func (pk PubKeyMultisigThreshold) Bytes() []byte {
 	return cdc.MustMarshalBinaryBare(pk)
 }
 
 // Address returns tmhash(PubKeyMultisigThreshold.Bytes())
-func (pk *PubKeyMultisigThreshold) Address() crypto.Address {
-	return crypto.Address(tmhash.Sum(pk.Bytes()))
+func (pk PubKeyMultisigThreshold) Address() crypto.Address {
+	return crypto.AddressHash(pk.Bytes())
 }
 
 // Equals returns true iff pk and other both have the same number of keys, and
 // all constituent keys are the same, and in the same order.
-func (pk *PubKeyMultisigThreshold) Equals(other crypto.PubKey) bool {
-	otherKey, sameType := other.(*PubKeyMultisigThreshold)
+func (pk PubKeyMultisigThreshold) Equals(other crypto.PubKey) bool {
+	otherKey, sameType := other.(PubKeyMultisigThreshold)
 	if !sameType {
 		return false
 	}
diff --git a/crypto/multisig/threshold_pubkey_test.go b/crypto/multisig/threshold_pubkey_test.go
index bfc874ebe..2d2632abd 100644
--- a/crypto/multisig/threshold_pubkey_test.go
+++ b/crypto/multisig/threshold_pubkey_test.go
@@ -82,7 +82,7 @@ func TestMultiSigPubKeyEquality(t *testing.T) {
 	msg := []byte{1, 2, 3, 4}
 	pubkeys, _ := generatePubKeysAndSignatures(5, msg)
 	multisigKey := NewPubKeyMultisigThreshold(2, pubkeys)
-	var unmarshalledMultisig *PubKeyMultisigThreshold
+	var unmarshalledMultisig PubKeyMultisigThreshold
 	cdc.MustUnmarshalBinaryBare(multisigKey.Bytes(), &unmarshalledMultisig)
 	require.True(t, multisigKey.Equals(unmarshalledMultisig))
 
@@ -95,6 +95,29 @@ func TestMultiSigPubKeyEquality(t *testing.T) {
 	require.False(t, multisigKey.Equals(multisigKey2))
 }
 
+func TestAddress(t *testing.T) {
+	msg := []byte{1, 2, 3, 4}
+	pubkeys, _ := generatePubKeysAndSignatures(5, msg)
+	multisigKey := NewPubKeyMultisigThreshold(2, pubkeys)
+	require.Len(t, multisigKey.Address().Bytes(), 20)
+}
+
+func TestPubKeyMultisigThresholdAminoToIface(t *testing.T) {
+	msg := []byte{1, 2, 3, 4}
+	pubkeys, _ := generatePubKeysAndSignatures(5, msg)
+	multisigKey := NewPubKeyMultisigThreshold(2, pubkeys)
+
+	ab, err := cdc.MarshalBinaryLengthPrefixed(multisigKey)
+	require.NoError(t, err)
+	// like other crypto.Pubkey implementations (e.g. ed25519.PubKeyEd25519),
+	// PubKeyMultisigThreshold should be deserializable into a crypto.PubKey:
+	var pubKey crypto.PubKey
+	err = cdc.UnmarshalBinaryLengthPrefixed(ab, &pubKey)
+	require.NoError(t, err)
+
+	require.Equal(t, multisigKey, pubKey)
+}
+
 func generatePubKeysAndSignatures(n int, msg []byte) (pubkeys []crypto.PubKey, signatures [][]byte) {
 	pubkeys = make([]crypto.PubKey, n)
 	signatures = make([][]byte, n)
diff --git a/crypto/multisig/wire.go b/crypto/multisig/wire.go
index 68b84fbfb..71e0db144 100644
--- a/crypto/multisig/wire.go
+++ b/crypto/multisig/wire.go
@@ -20,7 +20,7 @@ func init() {
 	cdc.RegisterConcrete(PubKeyMultisigThreshold{},
 		PubKeyMultisigThresholdAminoRoute, nil)
 	cdc.RegisterConcrete(ed25519.PubKeyEd25519{},
-		ed25519.PubKeyAminoRoute, nil)
+		ed25519.PubKeyAminoName, nil)
 	cdc.RegisterConcrete(secp256k1.PubKeySecp256k1{},
-		secp256k1.PubKeyAminoRoute, nil)
+		secp256k1.PubKeyAminoName, nil)
 }
diff --git a/crypto/secp256k1/secp256k1.go b/crypto/secp256k1/secp256k1.go
index 7fc46d634..d3528fdd6 100644
--- a/crypto/secp256k1/secp256k1.go
+++ b/crypto/secp256k1/secp256k1.go
@@ -16,8 +16,8 @@ import (
 
 //-------------------------------------
 const (
-	PrivKeyAminoRoute = "tendermint/PrivKeySecp256k1"
-	PubKeyAminoRoute  = "tendermint/PubKeySecp256k1"
+	PrivKeyAminoName = "tendermint/PrivKeySecp256k1"
+	PubKeyAminoName  = "tendermint/PubKeySecp256k1"
 )
 
 var cdc = amino.NewCodec()
@@ -25,11 +25,11 @@ var cdc = amino.NewCodec()
 func init() {
 	cdc.RegisterInterface((*crypto.PubKey)(nil), nil)
 	cdc.RegisterConcrete(PubKeySecp256k1{},
-		PubKeyAminoRoute, nil)
+		PubKeyAminoName, nil)
 
 	cdc.RegisterInterface((*crypto.PrivKey)(nil), nil)
 	cdc.RegisterConcrete(PrivKeySecp256k1{},
-		PrivKeyAminoRoute, nil)
+		PrivKeyAminoName, nil)
 }
 
 //-------------------------------------
diff --git a/docs/.vuepress/config.js b/docs/.vuepress/config.js
index 7c8aeee5e..5ecc97cf5 100644
--- a/docs/.vuepress/config.js
+++ b/docs/.vuepress/config.js
@@ -19,7 +19,10 @@ module.exports = {
       indexName: 'tendermint',
       debug: false
     },
-    nav: [{ text: "Back to Tendermint", link: "https://tendermint.com" }],
+    nav: [
+      { text: "Back to Tendermint", link: "https://tendermint.com" },
+      { text: "RPC", link: "../rpc/" }
+    ],
     sidebar: [
       {
         title: "Introduction",
@@ -31,6 +34,20 @@ module.exports = {
           "/introduction/what-is-tendermint"
         ]
       },
+      {
+        title: "Apps",
+        collapsable: false,
+        children: [
+          "/app-dev/getting-started",
+          "/app-dev/abci-cli",
+          "/app-dev/app-architecture",
+          "/app-dev/app-development",
+          "/app-dev/subscribing-to-events-via-websocket",
+          "/app-dev/indexing-transactions",
+          "/app-dev/abci-spec",
+          "/app-dev/ecosystem"
+        ]
+      },
       {
         title: "Tendermint Core",
         collapsable: false,
@@ -49,15 +66,6 @@ module.exports = {
           "/tendermint-core/validators"
         ]
       },
-      {
-        title: "Tools",
-        collapsable: false,
-        children:  [
-	  "/tools/",
-	  "/tools/benchmarking",
-	  "/tools/monitoring"
-	]
-      },
       {
         title: "Networks",
         collapsable: false,
@@ -68,18 +76,13 @@ module.exports = {
         ]
       },
       {
-        title: "Apps",
+        title: "Tools",
         collapsable: false,
-        children: [
-          "/app-dev/getting-started",
-          "/app-dev/abci-cli",
-          "/app-dev/app-architecture",
-          "/app-dev/app-development",
-          "/app-dev/subscribing-to-events-via-websocket",
-          "/app-dev/indexing-transactions",
-          "/app-dev/abci-spec",
-          "/app-dev/ecosystem"
-        ]
+        children:  [
+	  "/tools/",
+	  "/tools/benchmarking",
+	  "/tools/monitoring"
+	]
       },
       {
         title: "Tendermint Spec",
diff --git a/docs/architecture/adr-030-consensus-refactor.md b/docs/architecture/adr-030-consensus-refactor.md
index d48cfe103..5c8c3d754 100644
--- a/docs/architecture/adr-030-consensus-refactor.md
+++ b/docs/architecture/adr-030-consensus-refactor.md
@@ -126,6 +126,312 @@ func TestConsensusXXX(t *testing.T) {
 }
 ```
 
+
+## Consensus Executor
+
+## Consensus Core
+
+```go
+type Event interface{}
+
+type EventNewHeight struct {
+    Height           int64
+    ValidatorId      int
+}
+
+type EventNewRound HeightAndRound
+
+type EventProposal struct {
+    Height           int64
+    Round            int
+    Timestamp        Time
+    BlockID          BlockID
+    POLRound         int
+    Sender           int   
+}
+
+type Majority23PrevotesBlock struct {
+    Height           int64
+    Round            int
+    BlockID          BlockID
+}
+
+type Majority23PrecommitBlock struct {
+    Height           int64
+    Round            int
+    BlockID          BlockID
+}
+
+type HeightAndRound struct {
+    Height           int64
+    Round            int
+}
+
+type Majority23PrevotesAny HeightAndRound
+type Majority23PrecommitAny HeightAndRound
+type TimeoutPropose HeightAndRound
+type TimeoutPrevotes HeightAndRound
+type TimeoutPrecommit HeightAndRound
+
+
+type Message interface{}
+
+type MessageProposal struct {
+    Height           int64
+    Round            int
+    BlockID          BlockID
+    POLRound         int
+}
+
+type VoteType int
+
+const (
+	VoteTypeUnknown VoteType = iota
+	Prevote
+	Precommit
+)
+
+
+type MessageVote struct {
+    Height           int64
+    Round            int
+    BlockID          BlockID
+    Type             VoteType
+}
+
+
+type MessageDecision struct {
+    Height           int64
+    Round            int
+    BlockID          BlockID
+}
+
+type TriggerTimeout struct {
+    Height           int64
+    Round            int
+    Duration         Duration
+}
+
+
+type RoundStep int
+
+const (
+	RoundStepUnknown RoundStep = iota
+	RoundStepPropose       
+	RoundStepPrevote
+	RoundStepPrecommit
+	RoundStepCommit
+)
+
+type State struct {
+	Height           int64
+	Round            int
+	Step             RoundStep
+	LockedValue      BlockID
+	LockedRound      int
+	ValidValue       BlockID
+	ValidRound       int
+	ValidatorId      int
+	ValidatorSetSize int
+}
+
+func proposer(height int64, round int) int {}
+func getValue() BlockID {}
+
+func Consensus(event Event, state State) (State, Message, TriggerTimeout) {
+    msg = nil
+    timeout = nil
+	switch event := event.(type) {
+    	case EventNewHeight:
+    		if event.Height > state.Height {
+    		    state.Height = event.Height
+    		    state.Round = -1
+    		    state.Step = RoundStepPropose
+    		    state.LockedValue = nil
+    		    state.LockedRound = -1
+    		    state.ValidValue = nil
+    		    state.ValidRound = -1
+    		    state.ValidatorId = event.ValidatorId
+    		} 
+    	    return state, msg, timeout
+    	
+    	case EventNewRound:
+    		if event.Height == state.Height and event.Round > state.Round {
+               state.Round = eventRound
+               state.Step = RoundStepPropose
+               if proposer(state.Height, state.Round) == state.ValidatorId {
+                   proposal = state.ValidValue
+                   if proposal == nil {
+                   	    proposal = getValue()
+                   }
+                   msg =  MessageProposal { state.Height, state.Round, proposal, state.ValidRound }
+               }
+               timeout = TriggerTimeout { state.Height, state.Round, timeoutPropose(state.Round) }
+            }
+    	    return state, msg, timeout
+    	
+    	case EventProposal:
+    		if event.Height == state.Height and event.Round == state.Round and 
+    	       event.Sender == proposal(state.Height, state.Round) and state.Step == RoundStepPropose { 
+    	       	if event.POLRound >= state.LockedRound or event.BlockID == state.BlockID or state.LockedRound == -1 {
+    	       		msg = MessageVote { state.Height, state.Round, event.BlockID, Prevote }
+    	       	}
+    	       	state.Step = RoundStepPrevote
+            }
+    	    return state, msg, timeout
+    	
+    	case TimeoutPropose:
+    		if event.Height == state.Height and event.Round == state.Round and state.Step == RoundStepPropose {
+    		    msg = MessageVote { state.Height, state.Round, nil, Prevote }
+    			state.Step = RoundStepPrevote
+            }
+    	    return state, msg, timeout
+    	
+    	case Majority23PrevotesBlock:
+    		if event.Height == state.Height and event.Round == state.Round and state.Step >= RoundStepPrevote and event.Round > state.ValidRound {
+    		    state.ValidRound = event.Round
+    		    state.ValidValue = event.BlockID
+    		    if state.Step == RoundStepPrevote {
+    		    	state.LockedRound = event.Round
+    		    	state.LockedValue = event.BlockID
+    		    	msg = MessageVote { state.Height, state.Round, event.BlockID, Precommit }
+    		    	state.Step = RoundStepPrecommit
+    		    }
+            }
+    	    return state, msg, timeout
+    	
+    	case Majority23PrevotesAny:
+    		if event.Height == state.Height and event.Round == state.Round and state.Step == RoundStepPrevote {
+    			timeout = TriggerTimeout { state.Height, state.Round, timeoutPrevote(state.Round) }
+    		}
+    	    return state, msg, timeout
+    	
+    	case TimeoutPrevote:
+    		if event.Height == state.Height and event.Round == state.Round and state.Step == RoundStepPrevote {
+    			msg = MessageVote { state.Height, state.Round, nil, Precommit }
+    			state.Step = RoundStepPrecommit
+    		}
+    	    return state, msg, timeout
+    	
+    	case Majority23PrecommitBlock:
+    		if event.Height == state.Height {
+    		    state.Step = RoundStepCommit
+    		    state.LockedValue = event.BlockID
+    		}
+    	    return state, msg, timeout
+    		
+    	case Majority23PrecommitAny:
+    		if event.Height == state.Height and event.Round == state.Round {
+    			timeout = TriggerTimeout { state.Height, state.Round, timeoutPrecommit(state.Round) }
+    		}
+    	    return state, msg, timeout
+    	
+    	case TimeoutPrecommit:
+            if event.Height == state.Height and event.Round == state.Round {
+            	state.Round = state.Round + 1
+            }
+    	    return state, msg, timeout
+	}
+}	
+
+func ConsensusExecutor() {
+	proposal = nil
+	votes = HeightVoteSet { Height: 1 }
+	state = State {
+		Height:       1
+		Round:        0          
+		Step:         RoundStepPropose
+		LockedValue:  nil
+		LockedRound:  -1
+		ValidValue:   nil
+		ValidRound:   -1
+	}
+	
+	event = EventNewHeight {1, id}
+	state, msg, timeout = Consensus(event, state)
+	
+	event = EventNewRound {state.Height, 0}
+	state, msg, timeout = Consensus(event, state)
+	
+	if msg != nil {
+		send msg
+	}
+	
+	if timeout != nil {
+		trigger timeout
+	}
+	
+	for {
+		select {
+		    case message := <- msgCh:
+		    	switch msg := message.(type) {
+		    	    case MessageProposal:
+		    	        
+		    	    case MessageVote:	
+		    	    	if msg.Height == state.Height {
+		    	    		newVote = votes.AddVote(msg)
+		    	    		if newVote {
+		    	    			switch msg.Type {
+                                	case Prevote:
+                                		prevotes = votes.Prevotes(msg.Round)
+                                		if prevotes.WeakCertificate() and msg.Round > state.Round {
+                                			event = EventNewRound { msg.Height, msg.Round }
+                                			state, msg, timeout = Consensus(event, state)
+                                			state = handleStateChange(state, msg, timeout)
+                                		}	
+                                		
+                                		if blockID, ok = prevotes.TwoThirdsMajority(); ok and blockID != nil {
+                                		    if msg.Round == state.Round and hasBlock(blockID) {
+                                		    	event = Majority23PrevotesBlock { msg.Height, msg.Round, blockID }
+                                		    	state, msg, timeout = Consensus(event, state)
+                                		    	state = handleStateChange(state, msg, timeout)
+                                		    } 
+                                		    if proposal != nil and proposal.POLRound == msg.Round and hasBlock(blockID) {
+                                		        event = EventProposal {
+                                                        Height: state.Height
+                                                        Round:  state.Round
+                                                        BlockID: blockID
+                                                        POLRound: proposal.POLRound
+                                                        Sender: message.Sender
+                                		        }
+                                		        state, msg, timeout = Consensus(event, state)
+                                		        state = handleStateChange(state, msg, timeout)
+                                		    }
+                                		}
+                                		
+                                		if prevotes.HasTwoThirdsAny() and msg.Round == state.Round {
+                                			event = Majority23PrevotesAny { msg.Height, msg.Round, blockID }
+                                			state, msg, timeout = Consensus(event, state)
+                                            state = handleStateChange(state, msg, timeout)
+                                		}
+                                		
+                                	case Precommit:	
+                                		
+		    	    		    }
+		    	    	    }
+		    	        }
+		    case timeout := <- timeoutCh:
+		    
+		    case block := <- blockCh:	
+		    	
+		}
+	}
+}
+	
+func handleStateChange(state, msg, timeout) State {
+	if state.Step == Commit {
+		state = ExecuteBlock(state.LockedValue)
+	}	
+	if msg != nil {
+		send msg
+	}	
+	if timeout != nil {
+		trigger timeout
+	}	
+}
+
+```
+
 ### Implementation roadmap
 
 * implement proposed implementation
diff --git a/docs/package-lock.json b/docs/package-lock.json
deleted file mode 100644
index 3449eda1a..000000000
--- a/docs/package-lock.json
+++ /dev/null
@@ -1,4670 +0,0 @@
-{
-  "name": "tendermint",
-  "version": "0.0.1",
-  "lockfileVersion": 1,
-  "requires": true,
-  "dependencies": {
-    "@azu/format-text": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/@azu/format-text/-/format-text-1.0.1.tgz",
-      "integrity": "sha1-aWc1CpRkD2sChVFpvYl85U1s6+I="
-    },
-    "@azu/style-format": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/@azu/style-format/-/style-format-1.0.0.tgz",
-      "integrity": "sha1-5wGH+Khi4ZGxvObAJo8TrNOlayA=",
-      "requires": {
-        "@azu/format-text": "^1.0.1"
-      }
-    },
-    "@sindresorhus/is": {
-      "version": "0.7.0",
-      "resolved": "https://registry.npmjs.org/@sindresorhus/is/-/is-0.7.0.tgz",
-      "integrity": "sha512-ONhaKPIufzzrlNbqtWFFd+jlnemX6lJAgq9ZeiZtS7I1PIf/la7CW4m83rTXRnVnsMbW2k56pGYu7AUFJD9Pow=="
-    },
-    "@textlint/ast-node-types": {
-      "version": "4.0.3",
-      "resolved": "https://registry.npmjs.org/@textlint/ast-node-types/-/ast-node-types-4.0.3.tgz",
-      "integrity": "sha512-mkkqbuxZkCESmMCrVN5QEgmFqBJAcoAGIaZaQfziqKAyCQBLLgKVJzeFuup9mDm9mvCTKekhLk9yIaEFc8EFxA=="
-    },
-    "@textlint/ast-traverse": {
-      "version": "2.0.9",
-      "resolved": "https://registry.npmjs.org/@textlint/ast-traverse/-/ast-traverse-2.0.9.tgz",
-      "integrity": "sha512-E2neVj65wyadt3hr9R+DHW01dG4dNOMmFRab7Bph/rkDDeK85w/6RNJgIt9vBCPtt7a4bndTj1oZrK6wDZAEtQ==",
-      "requires": {
-        "@textlint/ast-node-types": "^4.0.3"
-      }
-    },
-    "@textlint/feature-flag": {
-      "version": "3.0.5",
-      "resolved": "https://registry.npmjs.org/@textlint/feature-flag/-/feature-flag-3.0.5.tgz",
-      "integrity": "sha512-hXTDGvltgiUtJs7QhALSILNE+g0cdY4CyqHR2r5+EmiYbS3NuqWVLn3GZYUPWXl9rVDky/IpR+6DF0uLJF8m8Q==",
-      "requires": {
-        "map-like": "^2.0.0"
-      }
-    },
-    "@textlint/fixer-formatter": {
-      "version": "3.0.8",
-      "resolved": "https://registry.npmjs.org/@textlint/fixer-formatter/-/fixer-formatter-3.0.8.tgz",
-      "integrity": "sha512-LTHcCLTyESdz90NGYzrYC0juSqLzGBc5VMMRO8Xvz3fapBya/Sn5ncgvsHqnKY0OIbV/IdOT54G2F46D8R6P9Q==",
-      "requires": {
-        "@textlint/kernel": "^3.0.0",
-        "chalk": "^1.1.3",
-        "debug": "^2.1.0",
-        "diff": "^2.2.2",
-        "interop-require": "^1.0.0",
-        "is-file": "^1.0.0",
-        "string-width": "^1.0.1",
-        "text-table": "^0.2.0",
-        "try-resolve": "^1.0.1"
-      },
-      "dependencies": {
-        "@textlint/kernel": {
-          "version": "3.0.0",
-          "resolved": "https://registry.npmjs.org/@textlint/kernel/-/kernel-3.0.0.tgz",
-          "integrity": "sha512-SxHWr6VAD/SdqTCy1uB03bFLbGYbhZeQTeUuIJE6s1pD7wtQ1+Y1n8nx9I9m7nqGZi5eYuVA6WnpvCq10USz+w==",
-          "requires": {
-            "@textlint/ast-node-types": "^4.0.3",
-            "@textlint/ast-traverse": "^2.0.9",
-            "@textlint/feature-flag": "^3.0.5",
-            "@types/bluebird": "^3.5.18",
-            "bluebird": "^3.5.1",
-            "debug": "^2.6.6",
-            "deep-equal": "^1.0.1",
-            "map-like": "^2.0.0",
-            "object-assign": "^4.1.1",
-            "structured-source": "^3.0.2"
-          }
-        },
-        "ansi-styles": {
-          "version": "2.2.1",
-          "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-2.2.1.tgz",
-          "integrity": "sha1-tDLdM1i2NM914eRmQ2gkBTPB3b4="
-        },
-        "chalk": {
-          "version": "1.1.3",
-          "resolved": "http://registry.npmjs.org/chalk/-/chalk-1.1.3.tgz",
-          "integrity": "sha1-qBFcVeSnAv5NFQq9OHKCKn4J/Jg=",
-          "requires": {
-            "ansi-styles": "^2.2.1",
-            "escape-string-regexp": "^1.0.2",
-            "has-ansi": "^2.0.0",
-            "strip-ansi": "^3.0.0",
-            "supports-color": "^2.0.0"
-          }
-        },
-        "supports-color": {
-          "version": "2.0.0",
-          "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-2.0.0.tgz",
-          "integrity": "sha1-U10EXOa2Nj+kARcIRimZXp3zJMc="
-        }
-      }
-    },
-    "@textlint/kernel": {
-      "version": "2.0.9",
-      "resolved": "https://registry.npmjs.org/@textlint/kernel/-/kernel-2.0.9.tgz",
-      "integrity": "sha512-0237/9yDIlSVaH0pcVAxm0rV1xF96UpjXUXoBRdciWnf2+O0tWQEeBC9B2/B2jLw9Ha0zGlK+q+bLREpXB97Cw==",
-      "requires": {
-        "@textlint/ast-node-types": "^4.0.2",
-        "@textlint/ast-traverse": "^2.0.8",
-        "@textlint/feature-flag": "^3.0.4",
-        "@types/bluebird": "^3.5.18",
-        "bluebird": "^3.5.1",
-        "debug": "^2.6.6",
-        "deep-equal": "^1.0.1",
-        "object-assign": "^4.1.1",
-        "structured-source": "^3.0.2"
-      }
-    },
-    "@textlint/linter-formatter": {
-      "version": "3.0.8",
-      "resolved": "https://registry.npmjs.org/@textlint/linter-formatter/-/linter-formatter-3.0.8.tgz",
-      "integrity": "sha512-hayZi4ybj01Km9Soi34cT8EkmEcqGgQKHu1tvPQVd8S2zaE3m/8nmf6qhwAo/HAwMzbIj0XxdV8nVuiUfz8ADQ==",
-      "requires": {
-        "@azu/format-text": "^1.0.1",
-        "@azu/style-format": "^1.0.0",
-        "@textlint/kernel": "^3.0.0",
-        "chalk": "^1.0.0",
-        "concat-stream": "^1.5.1",
-        "js-yaml": "^3.2.4",
-        "optionator": "^0.8.1",
-        "pluralize": "^2.0.0",
-        "string-width": "^1.0.1",
-        "string.prototype.padstart": "^3.0.0",
-        "strip-ansi": "^3.0.1",
-        "table": "^3.7.8",
-        "text-table": "^0.2.0",
-        "try-resolve": "^1.0.1",
-        "xml-escape": "^1.0.0"
-      },
-      "dependencies": {
-        "@textlint/kernel": {
-          "version": "3.0.0",
-          "resolved": "https://registry.npmjs.org/@textlint/kernel/-/kernel-3.0.0.tgz",
-          "integrity": "sha512-SxHWr6VAD/SdqTCy1uB03bFLbGYbhZeQTeUuIJE6s1pD7wtQ1+Y1n8nx9I9m7nqGZi5eYuVA6WnpvCq10USz+w==",
-          "requires": {
-            "@textlint/ast-node-types": "^4.0.3",
-            "@textlint/ast-traverse": "^2.0.9",
-            "@textlint/feature-flag": "^3.0.5",
-            "@types/bluebird": "^3.5.18",
-            "bluebird": "^3.5.1",
-            "debug": "^2.6.6",
-            "deep-equal": "^1.0.1",
-            "map-like": "^2.0.0",
-            "object-assign": "^4.1.1",
-            "structured-source": "^3.0.2"
-          }
-        },
-        "ansi-styles": {
-          "version": "2.2.1",
-          "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-2.2.1.tgz",
-          "integrity": "sha1-tDLdM1i2NM914eRmQ2gkBTPB3b4="
-        },
-        "chalk": {
-          "version": "1.1.3",
-          "resolved": "http://registry.npmjs.org/chalk/-/chalk-1.1.3.tgz",
-          "integrity": "sha1-qBFcVeSnAv5NFQq9OHKCKn4J/Jg=",
-          "requires": {
-            "ansi-styles": "^2.2.1",
-            "escape-string-regexp": "^1.0.2",
-            "has-ansi": "^2.0.0",
-            "strip-ansi": "^3.0.0",
-            "supports-color": "^2.0.0"
-          }
-        },
-        "supports-color": {
-          "version": "2.0.0",
-          "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-2.0.0.tgz",
-          "integrity": "sha1-U10EXOa2Nj+kARcIRimZXp3zJMc="
-        }
-      }
-    },
-    "@textlint/markdown-to-ast": {
-      "version": "6.0.9",
-      "resolved": "https://registry.npmjs.org/@textlint/markdown-to-ast/-/markdown-to-ast-6.0.9.tgz",
-      "integrity": "sha512-hfAWBvTeUGh5t5kTn2U3uP3qOSM1BSrxzl1jF3nn0ywfZXpRBZr5yRjXnl4DzIYawCtZOshmRi/tI3/x4TE1jQ==",
-      "requires": {
-        "@textlint/ast-node-types": "^4.0.3",
-        "debug": "^2.1.3",
-        "remark-frontmatter": "^1.2.0",
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diff --git a/docs/package.json b/docs/package.json
deleted file mode 100644
index d45ba539b..000000000
--- a/docs/package.json
+++ /dev/null
@@ -1,40 +0,0 @@
-{
-  "dependencies": {
-    "prettier": "^1.13.7",
-    "remark-cli": "^5.0.0",
-    "remark-lint-no-dead-urls": "^0.3.0",
-    "remark-lint-write-good": "^1.0.3",
-    "textlint": "^10.2.1",
-    "textlint-rule-stop-words": "^1.0.3"
-  },
-  "name": "tendermint",
-  "description": "Tendermint Core Documentation",
-  "version": "0.0.1",
-  "main": "README.md",
-  "devDependencies": {},
-  "scripts": {
-    "lint:json": "prettier \"**/*.json\" --write",
-    "lint:md": "prettier \"**/*.md\" --write && remark . && textlint \"md/**\"",
-    "lint": "yarn lint:json && yarn lint:md"
-  },
-  "repository": {
-    "type": "git",
-    "url": "git+https://github.com/tendermint/tendermint.git"
-  },
-  "keywords": [
-    "tendermint",
-    "blockchain"
-  ],
-  "author": "Tendermint",
-  "license": "ISC",
-  "bugs": {
-    "url": "https://github.com/tendermint/tendermint/issues"
-  },
-  "homepage": "https://tendermint.com/docs/",
-  "remarkConfig": {
-    "plugins": [
-      "remark-lint-no-dead-urls",
-      "remark-lint-write-good"
-    ]
-  }
-}
diff --git a/docs/spec/abci/apps.md b/docs/spec/abci/apps.md
index acf2c4e66..a378a2a86 100644
--- a/docs/spec/abci/apps.md
+++ b/docs/spec/abci/apps.md
@@ -407,21 +407,22 @@ If `storeBlockHeight == stateBlockHeight && appBlockHeight < storeBlockHeight`,
 replay all blocks in full from `appBlockHeight` to `storeBlockHeight`.
 This happens if we completed processing the block, but the app forgot its height.
 
-If `storeBlockHeight == stateBlockHeight && appBlockHeight == storeBlockHeight`, we're done
+If `storeBlockHeight == stateBlockHeight && appBlockHeight == storeBlockHeight`, we're done.
 This happens if we crashed at an opportune spot.
 
 If `storeBlockHeight == stateBlockHeight+1`
 This happens if we started processing the block but didn't finish.
 
-    If `appBlockHeight < stateBlockHeight`
-    	replay all blocks in full from `appBlockHeight` to `storeBlockHeight-1`,
-    	and replay the block at `storeBlockHeight` using the WAL.
-    This happens if the app forgot the last block it committed.
+If `appBlockHeight < stateBlockHeight`
+    replay all blocks in full from `appBlockHeight` to `storeBlockHeight-1`,
+    and replay the block at `storeBlockHeight` using the WAL.
+This happens if the app forgot the last block it committed.
 
-    If `appBlockHeight == stateBlockHeight`,
-    	replay the last block (storeBlockHeight) in full.
-    This happens if we crashed before the app finished Commit
+If `appBlockHeight == stateBlockHeight`,
+    replay the last block (storeBlockHeight) in full.
+This happens if we crashed before the app finished Commit
+
+If `appBlockHeight == storeBlockHeight`
+    update the state using the saved ABCI responses but dont run the block against the real app.
+This happens if we crashed after the app finished Commit but before Tendermint saved the state.
 
-    If appBlockHeight == storeBlockHeight {
-    	update the state using the saved ABCI responses but dont run the block against the real app.
-    This happens if we crashed after the app finished Commit but before Tendermint saved the state.
diff --git a/docs/spec/blockchain/blockchain.md b/docs/spec/blockchain/blockchain.md
index d96a3c7b8..cda323265 100644
--- a/docs/spec/blockchain/blockchain.md
+++ b/docs/spec/blockchain/blockchain.md
@@ -230,7 +230,7 @@ The block version must match the state version.
 len(block.ChainID) < 50
 ```
 
-ChainID must be maximum 50 UTF-8 symbols.
+ChainID must be less than 50 bytes.
 
 ### Height
 
diff --git a/docs/spec/consensus/signing.md b/docs/spec/consensus/signing.md
new file mode 100644
index 000000000..d1ee71a63
--- /dev/null
+++ b/docs/spec/consensus/signing.md
@@ -0,0 +1,205 @@
+# Validator Signing
+
+Here we specify the rules for validating a proposal and vote before signing.
+First we include some general notes on validating data structures common to both types.
+We then provide specific validation rules for each. Finally, we include validation rules to prevent double-sigining.
+
+## SignedMsgType
+
+The `SignedMsgType` is a single byte that refers to the type of the message
+being signed. It is defined in Go as follows:
+
+```
+// SignedMsgType is a type of signed message in the consensus.
+type SignedMsgType byte
+
+const (
+	// Votes
+	PrevoteType   SignedMsgType = 0x01
+	PrecommitType SignedMsgType = 0x02
+
+	// Proposals
+	ProposalType SignedMsgType = 0x20
+)
+```
+
+All signed messages must correspond to one of these types.
+
+## Timestamp
+
+Timestamp validation is subtle and there are currently no bounds placed on the
+timestamp included in a proposal or vote. It is expected that validators will honestly
+report their local clock time. The median of all timestamps
+included in a commit is used as the timestamp for the next block height.
+
+Timestamps are expected to be strictly monotonic for a given validator, though
+this is not currently enforced.
+
+## ChainID
+
+ChainID is an unstructured string with a max length of 50-bytes.
+In the future, the ChainID may become structured, and may take on longer lengths.
+For now, it is recommended that signers be configured for a particular ChainID,
+and to only sign votes and proposals corresponding to that ChainID.
+
+## BlockID
+
+BlockID is the structure used to represent the block:
+
+```
+type BlockID struct {
+	Hash        []byte
+	PartsHeader PartSetHeader
+}
+
+type PartSetHeader struct {
+	Hash  []byte
+	Total int
+}
+```
+
+To be included in a valid vote or proposal, BlockID must either represent a `nil` block, or a complete one.
+We introduce two methods, `BlockID.IsNil()` and `BlockID.IsComplete()` for these cases, respectively.
+
+`BlockID.IsNil()` returns true for BlockID `b` if each of the following
+are true:
+
+```
+b.Hash == nil
+b.PartsHeader.Total == 0
+b.PartsHeader.Hash == nil
+```
+
+`BlockID.IsComplete()` returns true for BlockID `b` if each of the following
+are true:
+
+```
+len(b.Hash) == 32
+b.PartsHeader.Total > 0
+len(b.PartsHeader.Hash) == 32
+```
+
+## Proposals
+
+The structure of a propsal for signing looks like:
+
+```
+type CanonicalProposal struct {
+	Type      SignedMsgType // type alias for byte
+	Height    int64         `binary:"fixed64"`
+	Round     int64         `binary:"fixed64"`
+	POLRound  int64         `binary:"fixed64"`
+	BlockID   BlockID
+	Timestamp time.Time
+	ChainID   string
+}
+```
+
+A proposal is valid if each of the following lines evaluates to true for proposal `p`:
+
+```
+p.Type == 0x20
+p.Height > 0
+p.Round >= 0
+p.POLRound >= -1
+p.BlockID.IsComplete()
+```
+
+In other words, a proposal is valid for signing if it contains the type of a Proposal
+(0x20), has a positive, non-zero height, a
+non-negative round, a POLRound not less than -1, and a complete BlockID.
+
+## Votes
+
+The structure of a vote for signing looks like:
+
+```
+type CanonicalVote struct {
+	Type      SignedMsgType // type alias for byte
+	Height    int64         `binary:"fixed64"`
+	Round     int64         `binary:"fixed64"`
+	Timestamp time.Time
+	BlockID   BlockID
+	ChainID   string
+}
+```
+
+A vote is valid if each of the following lines evaluates to true for vote `v`:
+
+```
+v.Type == 0x1 || v.Type == 0x2
+v.Height > 0
+v.Round >= 0
+v.BlockID.IsNil() || v.BlockID.IsValid()
+```
+
+In other words, a vote is valid for signing if it contains the type of a Prevote
+or Precommit (0x1 or 0x2, respectively), has a positive, non-zero height, a
+non-negative round, and an empty or valid BlockID.
+
+## Invalid Votes and Proposals
+
+Votes and proposals which do not satisfy the above rules are considered invalid.
+Peers gossipping invalid votes and proposals may be disconnected from other peers on the network.
+Note, however, that there is not currently any explicit mechanism to punish validators signing votes or proposals that fail
+these basic validation rules.
+
+## Double Signing
+
+Signers must be careful not to sign conflicting messages, also known as "double signing" or "equivocating".
+Tendermint has mechanisms to publish evidence of validators that signed conflicting votes, so they can be punished
+by the application. Note Tendermint does not currently handle evidence of conflciting proposals, though it may in the future.
+
+### State
+
+To prevent such double signing, signers must track the height, round, and type of the last message signed.
+Assume the signer keeps the following state, `s`:
+
+```
+type LastSigned struct {
+	Height	int64
+	Round	int64
+	Type	SignedMsgType // byte
+}
+```
+
+After signing a vote or proposal `m`, the signer sets:
+
+```
+s.Height = m.Height
+s.Round = m.Round
+s.Type = m.Type
+```
+
+### Proposals
+
+A signer should only sign a proposal `p` if any of the following lines are true:
+
+```
+p.Height > s.Height
+p.Height == s.Height && p.Round > s.Round
+```
+
+In other words, a proposal should only be signed if it's at a higher height, or a higher round for the same height.
+Once a proposal or vote has been signed for a given height and round, a proposal should never be signed for the same height and round.
+
+### Votes
+
+A signer should only sign a vote `v` if any of the following lines are true:
+
+```
+v.Height > s.Height
+v.Height == s.Height && v.Round > s.Round
+v.Height == s.Height && v.Round == s.Round && v.Step == 0x1 && s.Step == 0x20
+v.Height == s.Height && v.Round == s.Round && v.Step == 0x2 && s.Step != 0x2
+```
+
+In other words, a vote should only be signed if it's:
+
+- at a higher height
+- at a higher round for the same height
+- a prevote for the same height and round where we haven't signed a prevote or precommit (but have signed a proposal)
+- a precommit for the same height and round where we haven't signed a precommit (but have signed a proposal and/or a prevote)
+
+This means that once a validator signs a prevote for a given height and round, the only other message it can sign for that height and round is a precommit.
+And once a validator signs a precommit for a given height and round, it must not sign any other message for that same height and round.
diff --git a/docs/tendermint-core/configuration.md b/docs/tendermint-core/configuration.md
index e66dcf511..0d9a58c4b 100644
--- a/docs/tendermint-core/configuration.md
+++ b/docs/tendermint-core/configuration.md
@@ -170,7 +170,7 @@ seed_mode = false
 private_peer_ids = ""
 
 # Toggle to disable guard against peers connecting from the same ip.
-allow_duplicate_ip = true
+allow_duplicate_ip = false
 
 # Peer connection configuration.
 handshake_timeout = "20s"
diff --git a/docs/tendermint-core/using-tendermint.md b/docs/tendermint-core/using-tendermint.md
index 148c874c3..2ca8c9e92 100644
--- a/docs/tendermint-core/using-tendermint.md
+++ b/docs/tendermint-core/using-tendermint.md
@@ -113,7 +113,7 @@ blocks are produced regularly, even if there are no transactions. See
 _No Empty Blocks_, below, to modify this setting.
 
 Tendermint supports in-process versions of the `counter`, `kvstore` and
-`nil` apps that ship as examples with `abci-cli`. It's easy to compile
+`noop` apps that ship as examples with `abci-cli`. It's easy to compile
 your own app in-process with Tendermint if it's written in Go. If your
 app is not written in Go, simply run it in another process, and use the
 `--proxy_app` flag to specify the address of the socket it is listening
diff --git a/docs/yarn.lock b/docs/yarn.lock
deleted file mode 100644
index 4f453ed47..000000000
--- a/docs/yarn.lock
+++ /dev/null
@@ -1,2611 +0,0 @@
-# THIS IS AN AUTOGENERATED FILE. DO NOT EDIT THIS FILE DIRECTLY.
-# yarn lockfile v1
-
-
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-
-"@azu/style-format@^1.0.0":
-  version "1.0.0"
-  resolved "https://registry.yarnpkg.com/@azu/style-format/-/style-format-1.0.0.tgz#e70187f8a862e191b1bce6c0268f13acd3a56b20"
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-
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-
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-  resolved "https://registry.yarnpkg.com/array-iterate/-/array-iterate-1.1.2.tgz#f66a57e84426f8097f4197fbb6c051b8e5cdf7d8"
-
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-  version "1.0.2"
-  resolved "https://registry.yarnpkg.com/array-union/-/array-union-1.0.2.tgz#9a34410e4f4e3da23dea375be5be70f24778ec39"
-  dependencies:
-    array-uniq "^1.0.1"
-
-array-uniq@^1.0.1:
-  version "1.0.3"
-  resolved "https://registry.yarnpkg.com/array-uniq/-/array-uniq-1.0.3.tgz#af6ac877a25cc7f74e058894753858dfdb24fdb6"
-
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-  version "0.2.1"
-  resolved "https://registry.yarnpkg.com/array-unique/-/array-unique-0.2.1.tgz#a1d97ccafcbc2625cc70fadceb36a50c58b01a53"
-
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-  version "1.0.1"
-  resolved "https://registry.yarnpkg.com/arrify/-/arrify-1.0.1.tgz#898508da2226f380df904728456849c1501a4b0d"
-
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-  version "0.2.4"
-  resolved "https://registry.yarnpkg.com/asn1/-/asn1-0.2.4.tgz#8d2475dfab553bb33e77b54e59e880bb8ce23136"
-  dependencies:
-    safer-buffer "~2.1.0"
-
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-  version "1.0.0"
-  resolved "https://registry.yarnpkg.com/assert-plus/-/assert-plus-1.0.0.tgz#f12e0f3c5d77b0b1cdd9146942e4e96c1e4dd525"
-
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-  version "1.0.1"
-  resolved "https://registry.yarnpkg.com/async-each/-/async-each-1.0.1.tgz#19d386a1d9edc6e7c1c85d388aedbcc56d33602d"
-
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-  version "0.4.0"
-  resolved "https://registry.yarnpkg.com/asynckit/-/asynckit-0.4.0.tgz#c79ed97f7f34cb8f2ba1bc9790bcc366474b4b79"
-
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-  version "0.7.0"
-  resolved "https://registry.yarnpkg.com/aws-sign2/-/aws-sign2-0.7.0.tgz#b46e890934a9591f2d2f6f86d7e6a9f1b3fe76a8"
-
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-  version "1.8.0"
-  resolved "https://registry.yarnpkg.com/aws4/-/aws4-1.8.0.tgz#f0e003d9ca9e7f59c7a508945d7b2ef9a04a542f"
-
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-  version "1.0.3"
-  resolved "https://registry.yarnpkg.com/bail/-/bail-1.0.3.tgz#63cfb9ddbac829b02a3128cd53224be78e6c21a3"
-
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-  version "1.0.0"
-  resolved "https://registry.yarnpkg.com/balanced-match/-/balanced-match-1.0.0.tgz#89b4d199ab2bee49de164ea02b89ce462d71b767"
-
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-  version "1.0.2"
-  resolved "https://registry.yarnpkg.com/bcrypt-pbkdf/-/bcrypt-pbkdf-1.0.2.tgz#a4301d389b6a43f9b67ff3ca11a3f6637e360e9e"
-  dependencies:
-    tweetnacl "^0.14.3"
-
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-  version "1.11.0"
-  resolved "https://registry.yarnpkg.com/binary-extensions/-/binary-extensions-1.11.0.tgz#46aa1751fb6a2f93ee5e689bb1087d4b14c6c205"
-
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-  version "3.5.1"
-  resolved "https://registry.yarnpkg.com/bluebird/-/bluebird-3.5.1.tgz#d9551f9de98f1fcda1e683d17ee91a0602ee2eb9"
-
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-  version "1.0.1"
-  resolved "https://registry.yarnpkg.com/boundary/-/boundary-1.0.1.tgz#4d67dc2602c0cc16dd9bce7ebf87e948290f5812"
-
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-  version "1.1.11"
-  resolved "https://registry.yarnpkg.com/brace-expansion/-/brace-expansion-1.1.11.tgz#3c7fcbf529d87226f3d2f52b966ff5271eb441dd"
-  dependencies:
-    balanced-match "^1.0.0"
-    concat-map "0.0.1"
-
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-  version "1.8.5"
-  resolved "https://registry.yarnpkg.com/braces/-/braces-1.8.5.tgz#ba77962e12dff969d6b76711e914b737857bf6a7"
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-    expand-range "^1.8.1"
-    preserve "^0.2.0"
-    repeat-element "^1.1.2"
-
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-  version "1.1.1"
-  resolved "https://registry.yarnpkg.com/buffer-from/-/buffer-from-1.1.1.tgz#32713bc028f75c02fdb710d7c7bcec1f2c6070ef"
-
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-  version "1.1.1"
-  resolved "https://registry.yarnpkg.com/builtin-modules/-/builtin-modules-1.1.1.tgz#270f076c5a72c02f5b65a47df94c5fe3a278892f"
-
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-  version "2.1.4"
-  resolved "https://registry.yarnpkg.com/cacheable-request/-/cacheable-request-2.1.4.tgz#0d808801b6342ad33c91df9d0b44dc09b91e5c3d"
-  dependencies:
-    clone-response "1.0.2"
-    get-stream "3.0.0"
-    http-cache-semantics "3.8.1"
-    keyv "3.0.0"
-    lowercase-keys "1.0.0"
-    normalize-url "2.0.1"
-    responselike "1.0.2"
-
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-  version "4.1.0"
-  resolved "https://registry.yarnpkg.com/camelcase/-/camelcase-4.1.0.tgz#d545635be1e33c542649c69173e5de6acfae34dd"
-
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-  version "1.0.0"
-  resolved "https://registry.yarnpkg.com/capture-stack-trace/-/capture-stack-trace-1.0.0.tgz#4a6fa07399c26bba47f0b2496b4d0fb408c5550d"
-
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-  version "0.12.0"
-  resolved "https://registry.yarnpkg.com/caseless/-/caseless-0.12.0.tgz#1b681c21ff84033c826543090689420d187151dc"
-
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-  version "1.0.3"
-  resolved "https://registry.yarnpkg.com/ccount/-/ccount-1.0.3.tgz#f1cec43f332e2ea5a569fd46f9f5bde4e6102aff"
-
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-  version "1.1.3"
-  resolved "https://registry.yarnpkg.com/chalk/-/chalk-1.1.3.tgz#a8115c55e4a702fe4d150abd3872822a7e09fc98"
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-    has-ansi "^2.0.0"
-    strip-ansi "^3.0.0"
-    supports-color "^2.0.0"
-
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-  version "2.4.1"
-  resolved "https://registry.yarnpkg.com/chalk/-/chalk-2.4.1.tgz#18c49ab16a037b6eb0152cc83e3471338215b66e"
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-    escape-string-regexp "^1.0.5"
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-
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-  version "1.1.2"
-  resolved "https://registry.yarnpkg.com/character-entities-html4/-/character-entities-html4-1.1.2.tgz#c44fdde3ce66b52e8d321d6c1bf46101f0150610"
-
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-  version "1.1.2"
-  resolved "https://registry.yarnpkg.com/character-entities-legacy/-/character-entities-legacy-1.1.2.tgz#7c6defb81648498222c9855309953d05f4d63a9c"
-
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-  version "1.2.2"
-  resolved "https://registry.yarnpkg.com/character-entities/-/character-entities-1.2.2.tgz#58c8f371c0774ef0ba9b2aca5f00d8f100e6e363"
-
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-  version "1.1.2"
-  resolved "https://registry.yarnpkg.com/character-reference-invalid/-/character-reference-invalid-1.1.2.tgz#21e421ad3d84055952dab4a43a04e73cd425d3ed"
-
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-  version "0.0.2"
-  resolved "https://registry.yarnpkg.com/charenc/-/charenc-0.0.2.tgz#c0a1d2f3a7092e03774bfa83f14c0fc5790a8667"
-
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-  version "1.7.0"
-  resolved "https://registry.yarnpkg.com/chokidar/-/chokidar-1.7.0.tgz#798e689778151c8076b4b360e5edd28cda2bb468"
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-    async-each "^1.0.0"
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-    is-glob "^2.0.0"
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-    readdirp "^2.0.0"
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-
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-  version "1.0.1"
-  resolved "https://registry.yarnpkg.com/chownr/-/chownr-1.0.1.tgz#e2a75042a9551908bebd25b8523d5f9769d79181"
-
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-  version "0.3.3"
-  resolved "https://registry.yarnpkg.com/circular-json/-/circular-json-0.3.3.tgz#815c99ea84f6809529d2f45791bdf82711352d66"
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-  version "1.3.0"
-  resolved "https://registry.yarnpkg.com/clean-stack/-/clean-stack-1.3.0.tgz#9e821501ae979986c46b1d66d2d432db2fd4ae31"
-
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-  version "1.0.2"
-  resolved "https://registry.yarnpkg.com/clone-response/-/clone-response-1.0.2.tgz#d1dc973920314df67fbeb94223b4ee350239e96b"
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-    mimic-response "^1.0.0"
-
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-  version "3.1.0"
-  resolved "https://registry.yarnpkg.com/co/-/co-3.1.0.tgz#4ea54ea5a08938153185e15210c68d9092bc1b78"
-
-co@^4.6.0:
-  version "4.6.0"
-  resolved "https://registry.yarnpkg.com/co/-/co-4.6.0.tgz#6ea6bdf3d853ae54ccb8e47bfa0bf3f9031fb184"
-
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-  version "1.1.0"
-  resolved "https://registry.yarnpkg.com/code-point-at/-/code-point-at-1.1.0.tgz#0d070b4d043a5bea33a2f1a40e2edb3d9a4ccf77"
-
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-  version "1.0.4"
-  resolved "https://registry.yarnpkg.com/collapse-white-space/-/collapse-white-space-1.0.4.tgz#ce05cf49e54c3277ae573036a26851ba430a0091"
-
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-  version "1.9.2"
-  resolved "https://registry.yarnpkg.com/color-convert/-/color-convert-1.9.2.tgz#49881b8fba67df12a96bdf3f56c0aab9e7913147"
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-
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-  version "1.1.1"
-  resolved "https://registry.yarnpkg.com/color-name/-/color-name-1.1.1.tgz#4b1415304cf50028ea81643643bd82ea05803689"
-
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-  version "1.0.6"
-  resolved "https://registry.yarnpkg.com/combined-stream/-/combined-stream-1.0.6.tgz#723e7df6e801ac5613113a7e445a9b69cb632818"
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-
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-  version "0.0.1"
-  resolved "https://registry.yarnpkg.com/concat-map/-/concat-map-0.0.1.tgz#d8a96bd77fd68df7793a73036a3ba0d5405d477b"
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-  version "1.6.2"
-  resolved "https://registry.yarnpkg.com/concat-stream/-/concat-stream-1.6.2.tgz#904bdf194cd3122fc675c77fc4ac3d4ff0fd1a34"
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-  version "1.1.0"
-  resolved "https://registry.yarnpkg.com/console-control-strings/-/console-control-strings-1.1.0.tgz#3d7cf4464db6446ea644bf4b39507f9851008e8e"
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-  version "1.0.2"
-  resolved "https://registry.yarnpkg.com/core-util-is/-/core-util-is-1.0.2.tgz#b5fd54220aa2bc5ab57aab7140c940754503c1a7"
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-  version "3.0.2"
-  resolved "https://registry.yarnpkg.com/create-error-class/-/create-error-class-3.0.2.tgz#06be7abef947a3f14a30fd610671d401bca8b7b6"
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-  version "0.0.2"
-  resolved "https://registry.yarnpkg.com/crypt/-/crypt-0.0.2.tgz#88d7ff7ec0dfb86f713dc87bbb42d044d3e6c41b"
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-  version "1.14.1"
-  resolved "https://registry.yarnpkg.com/dashdash/-/dashdash-1.14.1.tgz#853cfa0f7cbe2fed5de20326b8dd581035f6e2f0"
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-  version "2.6.9"
-  resolved "https://registry.yarnpkg.com/debug/-/debug-2.6.9.tgz#5d128515df134ff327e90a4c93f4e077a536341f"
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-  version "3.1.0"
-  resolved "https://registry.yarnpkg.com/debug/-/debug-3.1.0.tgz#5bb5a0672628b64149566ba16819e61518c67261"
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-  version "0.2.0"
-  resolved "https://registry.yarnpkg.com/decode-uri-component/-/decode-uri-component-0.2.0.tgz#eb3913333458775cb84cd1a1fae062106bb87545"
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-  version "3.3.0"
-  resolved "https://registry.yarnpkg.com/decompress-response/-/decompress-response-3.3.0.tgz#80a4dd323748384bfa248083622aedec982adff3"
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-  version "1.0.1"
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-  version "0.6.0"
-  resolved "https://registry.yarnpkg.com/deep-extend/-/deep-extend-0.6.0.tgz#c4fa7c95404a17a9c3e8ca7e1537312b736330ac"
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-  resolved "https://registry.yarnpkg.com/define-properties/-/define-properties-1.1.2.tgz#83a73f2fea569898fb737193c8f873caf6d45c94"
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-  resolved "https://registry.yarnpkg.com/del/-/del-2.2.2.tgz#c12c981d067846c84bcaf862cff930d907ffd1a8"
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-  version "1.0.0"
-  resolved "https://registry.yarnpkg.com/delayed-stream/-/delayed-stream-1.0.0.tgz#df3ae199acadfb7d440aaae0b29e2272b24ec619"
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-  version "1.0.0"
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-  resolved "https://registry.yarnpkg.com/remark-cli/-/remark-cli-5.0.0.tgz#9feefd06474f3d0ff132df21b5334c546df12ab6"
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-    markdown-extensions "^1.1.0"
-    remark "^9.0.0"
-    unified-args "^5.0.0"
-
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-  version "1.2.0"
-  resolved "https://registry.yarnpkg.com/remark-frontmatter/-/remark-frontmatter-1.2.0.tgz#67905d178c0fe531ed12c57b98759f101fc2c1b5"
-  dependencies:
-    fault "^1.0.1"
-    xtend "^4.0.1"
-
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-  version "0.3.0"
-  resolved "https://registry.yarnpkg.com/remark-lint-no-dead-urls/-/remark-lint-no-dead-urls-0.3.0.tgz#b640ecbb4ccaf780afe28c8d13e79f5dc6769449"
-  dependencies:
-    is-online "^7.0.0"
-    is-relative-url "^2.0.0"
-    link-check "^4.1.0"
-    unified-lint-rule "^1.0.1"
-    unist-util-visit "^1.1.3"
-
-remark-lint-write-good@^1.0.3:
-  version "1.0.3"
-  resolved "https://registry.yarnpkg.com/remark-lint-write-good/-/remark-lint-write-good-1.0.3.tgz#daa4cf122212cfa06e437702ef7b43a12875bd5d"
-  dependencies:
-    nlcst-to-string "^2.0.0"
-    unified-lint-rule "^1.0.1"
-    unist-util-visit "^1.1.1"
-    write-good "^0.11.1"
-
-remark-parse@^5.0.0:
-  version "5.0.0"
-  resolved "https://registry.yarnpkg.com/remark-parse/-/remark-parse-5.0.0.tgz#4c077f9e499044d1d5c13f80d7a98cf7b9285d95"
-  dependencies:
-    collapse-white-space "^1.0.2"
-    is-alphabetical "^1.0.0"
-    is-decimal "^1.0.0"
-    is-whitespace-character "^1.0.0"
-    is-word-character "^1.0.0"
-    markdown-escapes "^1.0.0"
-    parse-entities "^1.1.0"
-    repeat-string "^1.5.4"
-    state-toggle "^1.0.0"
-    trim "0.0.1"
-    trim-trailing-lines "^1.0.0"
-    unherit "^1.0.4"
-    unist-util-remove-position "^1.0.0"
-    vfile-location "^2.0.0"
-    xtend "^4.0.1"
-
-remark-stringify@^5.0.0:
-  version "5.0.0"
-  resolved "https://registry.yarnpkg.com/remark-stringify/-/remark-stringify-5.0.0.tgz#336d3a4d4a6a3390d933eeba62e8de4bd280afba"
-  dependencies:
-    ccount "^1.0.0"
-    is-alphanumeric "^1.0.0"
-    is-decimal "^1.0.0"
-    is-whitespace-character "^1.0.0"
-    longest-streak "^2.0.1"
-    markdown-escapes "^1.0.0"
-    markdown-table "^1.1.0"
-    mdast-util-compact "^1.0.0"
-    parse-entities "^1.0.2"
-    repeat-string "^1.5.4"
-    state-toggle "^1.0.0"
-    stringify-entities "^1.0.1"
-    unherit "^1.0.4"
-    xtend "^4.0.1"
-
-remark@^9.0.0:
-  version "9.0.0"
-  resolved "https://registry.yarnpkg.com/remark/-/remark-9.0.0.tgz#c5cfa8ec535c73a67c4b0f12bfdbd3a67d8b2f60"
-  dependencies:
-    remark-parse "^5.0.0"
-    remark-stringify "^5.0.0"
-    unified "^6.0.0"
-
-remove-trailing-separator@^1.0.1:
-  version "1.1.0"
-  resolved "https://registry.yarnpkg.com/remove-trailing-separator/-/remove-trailing-separator-1.1.0.tgz#c24bce2a283adad5bc3f58e0d48249b92379d8ef"
-
-repeat-element@^1.1.2:
-  version "1.1.2"
-  resolved "https://registry.yarnpkg.com/repeat-element/-/repeat-element-1.1.2.tgz#ef089a178d1483baae4d93eb98b4f9e4e11d990a"
-
-repeat-string@^1.5.0, repeat-string@^1.5.2, repeat-string@^1.5.4:
-  version "1.6.1"
-  resolved "https://registry.yarnpkg.com/repeat-string/-/repeat-string-1.6.1.tgz#8dcae470e1c88abc2d600fff4a776286da75e637"
-
-replace-ext@1.0.0:
-  version "1.0.0"
-  resolved "https://registry.yarnpkg.com/replace-ext/-/replace-ext-1.0.0.tgz#de63128373fcbf7c3ccfa4de5a480c45a67958eb"
-
-request@^2.87.0:
-  version "2.87.0"
-  resolved "https://registry.yarnpkg.com/request/-/request-2.87.0.tgz#32f00235cd08d482b4d0d68db93a829c0ed5756e"
-  dependencies:
-    aws-sign2 "~0.7.0"
-    aws4 "^1.6.0"
-    caseless "~0.12.0"
-    combined-stream "~1.0.5"
-    extend "~3.0.1"
-    forever-agent "~0.6.1"
-    form-data "~2.3.1"
-    har-validator "~5.0.3"
-    http-signature "~1.2.0"
-    is-typedarray "~1.0.0"
-    isstream "~0.1.2"
-    json-stringify-safe "~5.0.1"
-    mime-types "~2.1.17"
-    oauth-sign "~0.8.2"
-    performance-now "^2.1.0"
-    qs "~6.5.1"
-    safe-buffer "^5.1.1"
-    tough-cookie "~2.3.3"
-    tunnel-agent "^0.6.0"
-    uuid "^3.1.0"
-
-require-from-string@^2.0.2:
-  version "2.0.2"
-  resolved "https://registry.yarnpkg.com/require-from-string/-/require-from-string-2.0.2.tgz#89a7fdd938261267318eafe14f9c32e598c36909"
-
-resolve-from@^4.0.0:
-  version "4.0.0"
-  resolved "https://registry.yarnpkg.com/resolve-from/-/resolve-from-4.0.0.tgz#4abcd852ad32dd7baabfe9b40e00a36db5f392e6"
-
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-  version "1.0.2"
-  resolved "https://registry.yarnpkg.com/responselike/-/responselike-1.0.2.tgz#918720ef3b631c5642be068f15ade5a46f4ba1e7"
-  dependencies:
-    lowercase-keys "^1.0.0"
-
-rimraf@^2.2.8, rimraf@^2.6.1:
-  version "2.6.2"
-  resolved "https://registry.yarnpkg.com/rimraf/-/rimraf-2.6.2.tgz#2ed8150d24a16ea8651e6d6ef0f47c4158ce7a36"
-  dependencies:
-    glob "^7.0.5"
-
-safe-buffer@^5.0.1, safe-buffer@^5.1.1, safe-buffer@^5.1.2, safe-buffer@~5.1.0, safe-buffer@~5.1.1:
-  version "5.1.2"
-  resolved "https://registry.yarnpkg.com/safe-buffer/-/safe-buffer-5.1.2.tgz#991ec69d296e0313747d59bdfd2b745c35f8828d"
-
-"safer-buffer@>= 2.1.2 < 3", safer-buffer@^2.0.2, safer-buffer@^2.1.0, safer-buffer@~2.1.0:
-  version "2.1.2"
-  resolved "https://registry.yarnpkg.com/safer-buffer/-/safer-buffer-2.1.2.tgz#44fa161b0187b9549dd84bb91802f9bd8385cd6a"
-
-sax@^1.2.4:
-  version "1.2.4"
-  resolved "https://registry.yarnpkg.com/sax/-/sax-1.2.4.tgz#2816234e2378bddc4e5354fab5caa895df7100d9"
-
-"semver@2 || 3 || 4 || 5", semver@^5.3.0:
-  version "5.5.0"
-  resolved "https://registry.yarnpkg.com/semver/-/semver-5.5.0.tgz#dc4bbc7a6ca9d916dee5d43516f0092b58f7b8ab"
-
-set-blocking@~2.0.0:
-  version "2.0.0"
-  resolved "https://registry.yarnpkg.com/set-blocking/-/set-blocking-2.0.0.tgz#045f9782d011ae9a6803ddd382b24392b3d890f7"
-
-set-immediate-shim@^1.0.1:
-  version "1.0.1"
-  resolved "https://registry.yarnpkg.com/set-immediate-shim/-/set-immediate-shim-1.0.1.tgz#4b2b1b27eb808a9f8dcc481a58e5e56f599f3f61"
-
-shellsubstitute@^1.1.0:
-  version "1.2.0"
-  resolved "https://registry.yarnpkg.com/shellsubstitute/-/shellsubstitute-1.2.0.tgz#e4f702a50c518b0f6fe98451890d705af29b6b70"
-
-signal-exit@^3.0.0:
-  version "3.0.2"
-  resolved "https://registry.yarnpkg.com/signal-exit/-/signal-exit-3.0.2.tgz#b5fdc08f1287ea1178628e415e25132b73646c6d"
-
-slice-ansi@0.0.4:
-  version "0.0.4"
-  resolved "https://registry.yarnpkg.com/slice-ansi/-/slice-ansi-0.0.4.tgz#edbf8903f66f7ce2f8eafd6ceed65e264c831b35"
-
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-  version "1.0.1"
-  resolved "https://registry.yarnpkg.com/sliced/-/sliced-1.0.1.tgz#0b3a662b5d04c3177b1926bea82b03f837a2ef41"
-
-sort-keys@^2.0.0:
-  version "2.0.0"
-  resolved "https://registry.yarnpkg.com/sort-keys/-/sort-keys-2.0.0.tgz#658535584861ec97d730d6cf41822e1f56684128"
-  dependencies:
-    is-plain-obj "^1.0.0"
-
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-  version "3.0.0"
-  resolved "https://registry.yarnpkg.com/spdx-correct/-/spdx-correct-3.0.0.tgz#05a5b4d7153a195bc92c3c425b69f3b2a9524c82"
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-    spdx-expression-parse "^3.0.0"
-    spdx-license-ids "^3.0.0"
-
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-  version "2.1.0"
-  resolved "https://registry.yarnpkg.com/spdx-exceptions/-/spdx-exceptions-2.1.0.tgz#2c7ae61056c714a5b9b9b2b2af7d311ef5c78fe9"
-
-spdx-expression-parse@^3.0.0:
-  version "3.0.0"
-  resolved "https://registry.yarnpkg.com/spdx-expression-parse/-/spdx-expression-parse-3.0.0.tgz#99e119b7a5da00e05491c9fa338b7904823b41d0"
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-    spdx-exceptions "^2.1.0"
-    spdx-license-ids "^3.0.0"
-
-spdx-license-ids@^3.0.0:
-  version "3.0.0"
-  resolved "https://registry.yarnpkg.com/spdx-license-ids/-/spdx-license-ids-3.0.0.tgz#7a7cd28470cc6d3a1cfe6d66886f6bc430d3ac87"
-
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-  version "1.1.0"
-  resolved "https://registry.yarnpkg.com/split-lines/-/split-lines-1.1.0.tgz#3abba8f598614142f9db8d27ab6ab875662a1e09"
-
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-  version "1.0.3"
-  resolved "https://registry.yarnpkg.com/sprintf-js/-/sprintf-js-1.0.3.tgz#04e6926f662895354f3dd015203633b857297e2c"
-
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-  version "1.14.2"
-  resolved "https://registry.yarnpkg.com/sshpk/-/sshpk-1.14.2.tgz#c6fc61648a3d9c4e764fd3fcdf4ea105e492ba98"
-  dependencies:
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-    assert-plus "^1.0.0"
-    dashdash "^1.12.0"
-    getpass "^0.1.1"
-    safer-buffer "^2.0.2"
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-    ecc-jsbn "~0.1.1"
-    jsbn "~0.1.0"
-    tweetnacl "~0.14.0"
-
-state-toggle@^1.0.0:
-  version "1.0.1"
-  resolved "https://registry.yarnpkg.com/state-toggle/-/state-toggle-1.0.1.tgz#c3cb0974f40a6a0f8e905b96789eb41afa1cde3a"
-
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-  version "1.1.0"
-  resolved "https://registry.yarnpkg.com/strict-uri-encode/-/strict-uri-encode-1.1.0.tgz#279b225df1d582b1f54e65addd4352e18faa0713"
-
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-  version "1.0.2"
-  resolved "https://registry.yarnpkg.com/string-width/-/string-width-1.0.2.tgz#118bdf5b8cdc51a2a7e70d211e07e2b0b9b107d3"
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-    is-fullwidth-code-point "^1.0.0"
-    strip-ansi "^3.0.0"
-
-"string-width@^1.0.2 || 2", string-width@^2.0.0:
-  version "2.1.1"
-  resolved "https://registry.yarnpkg.com/string-width/-/string-width-2.1.1.tgz#ab93f27a8dc13d28cac815c462143a6d9012ae9e"
-  dependencies:
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-    strip-ansi "^4.0.0"
-
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-  version "3.0.0"
-  resolved "https://registry.yarnpkg.com/string.prototype.padstart/-/string.prototype.padstart-3.0.0.tgz#5bcfad39f4649bb2d031292e19bcf0b510d4b242"
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-    define-properties "^1.1.2"
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-    function-bind "^1.0.2"
-
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-  version "1.1.1"
-  resolved "https://registry.yarnpkg.com/string_decoder/-/string_decoder-1.1.1.tgz#9cf1611ba62685d7030ae9e4ba34149c3af03fc8"
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-    safe-buffer "~5.1.0"
-
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-  version "1.3.2"
-  resolved "https://registry.yarnpkg.com/stringify-entities/-/stringify-entities-1.3.2.tgz#a98417e5471fd227b3e45d3db1861c11caf668f7"
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-    is-alphanumerical "^1.0.0"
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-
-strip-ansi@^3.0.0, strip-ansi@^3.0.1:
-  version "3.0.1"
-  resolved "https://registry.yarnpkg.com/strip-ansi/-/strip-ansi-3.0.1.tgz#6a385fb8853d952d5ff05d0e8aaf94278dc63dcf"
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-  version "4.0.0"
-  resolved "https://registry.yarnpkg.com/strip-ansi/-/strip-ansi-4.0.0.tgz#a8479022eb1ac368a871389b635262c505ee368f"
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-  version "2.0.0"
-  resolved "https://registry.yarnpkg.com/strip-bom/-/strip-bom-2.0.0.tgz#6219a85616520491f35788bdbf1447a99c7e6b0e"
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-    is-utf8 "^0.2.0"
-
-strip-bom@^3.0.0:
-  version "3.0.0"
-  resolved "https://registry.yarnpkg.com/strip-bom/-/strip-bom-3.0.0.tgz#2334c18e9c759f7bdd56fdef7e9ae3d588e68ed3"
-
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-  version "2.0.1"
-  resolved "https://registry.yarnpkg.com/strip-json-comments/-/strip-json-comments-2.0.1.tgz#3c531942e908c2697c0ec344858c286c7ca0a60a"
-
-structured-source@^3.0.2:
-  version "3.0.2"
-  resolved "https://registry.yarnpkg.com/structured-source/-/structured-source-3.0.2.tgz#dd802425e0f53dc4a6e7aca3752901a1ccda7af5"
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-
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-  version "2.0.0"
-  resolved "https://registry.yarnpkg.com/supports-color/-/supports-color-2.0.0.tgz#535d045ce6b6363fa40117084629995e9df324c7"
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-  version "4.5.0"
-  resolved "https://registry.yarnpkg.com/supports-color/-/supports-color-4.5.0.tgz#be7a0de484dec5c5cddf8b3d59125044912f635b"
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-  version "5.4.0"
-  resolved "https://registry.yarnpkg.com/supports-color/-/supports-color-5.4.0.tgz#1c6b337402c2137605efe19f10fec390f6faab54"
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-  version "3.8.3"
-  resolved "https://registry.yarnpkg.com/table/-/table-3.8.3.tgz#2bbc542f0fda9861a755d3947fefd8b3f513855f"
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-    ajv-keywords "^1.0.0"
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-  version "4.4.6"
-  resolved "https://registry.yarnpkg.com/tar/-/tar-4.4.6.tgz#63110f09c00b4e60ac8bcfe1bf3c8660235fbc9b"
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-  version "0.2.0"
-  resolved "https://registry.yarnpkg.com/text-table/-/text-table-0.2.0.tgz#7f5ee823ae805207c00af2df4a84ec3fcfa570b4"
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-  version "2.0.0"
-  resolved "https://registry.yarnpkg.com/textlint-rule-helper/-/textlint-rule-helper-2.0.0.tgz#95cb4696c95c4258d2e3389e9e64b849f9721382"
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-  version "1.0.3"
-  resolved "https://registry.yarnpkg.com/textlint-rule-stop-words/-/textlint-rule-stop-words-1.0.3.tgz#fe2f40cbe5837331b2a09fdec57cc71758093bf0"
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-  version "10.2.1"
-  resolved "https://registry.yarnpkg.com/textlint/-/textlint-10.2.1.tgz#ee22b7967d59cef7c74a04a5f4e8883134e5c79d"
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-  version "4.0.1"
-  resolved "https://registry.yarnpkg.com/timed-out/-/timed-out-4.0.1.tgz#f32eacac5a175bea25d7fab565ab3ed8741ef56f"
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-  version "2.2.0"
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-  version "0.1.4"
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-  version "2.3.4"
-  resolved "https://registry.yarnpkg.com/tough-cookie/-/tough-cookie-2.3.4.tgz#ec60cee38ac675063ffc97a5c18970578ee83655"
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-  version "0.6.6"
-  resolved "https://registry.yarnpkg.com/traverse/-/traverse-0.6.6.tgz#cbdf560fd7b9af632502fed40f918c157ea97137"
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-trim-trailing-lines@^1.0.0:
-  version "1.1.1"
-  resolved "https://registry.yarnpkg.com/trim-trailing-lines/-/trim-trailing-lines-1.1.1.tgz#e0ec0810fd3c3f1730516b45f49083caaf2774d9"
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-trim@0.0.1:
-  version "0.0.1"
-  resolved "https://registry.yarnpkg.com/trim/-/trim-0.0.1.tgz#5858547f6b290757ee95cccc666fb50084c460dd"
-
-trough@^1.0.0:
-  version "1.0.3"
-  resolved "https://registry.yarnpkg.com/trough/-/trough-1.0.3.tgz#e29bd1614c6458d44869fc28b255ab7857ef7c24"
-
-try-resolve@^1.0.1:
-  version "1.0.1"
-  resolved "https://registry.yarnpkg.com/try-resolve/-/try-resolve-1.0.1.tgz#cfde6fabd72d63e5797cfaab873abbe8e700e912"
-
-tunnel-agent@^0.6.0:
-  version "0.6.0"
-  resolved "https://registry.yarnpkg.com/tunnel-agent/-/tunnel-agent-0.6.0.tgz#27a5dea06b36b04a0a9966774b290868f0fc40fd"
-  dependencies:
-    safe-buffer "^5.0.1"
-
-tweetnacl@^0.14.3, tweetnacl@~0.14.0:
-  version "0.14.5"
-  resolved "https://registry.yarnpkg.com/tweetnacl/-/tweetnacl-0.14.5.tgz#5ae68177f192d4456269d108afa93ff8743f4f64"
-
-type-check@~0.3.2:
-  version "0.3.2"
-  resolved "https://registry.yarnpkg.com/type-check/-/type-check-0.3.2.tgz#5884cab512cf1d355e3fb784f30804b2b520db72"
-  dependencies:
-    prelude-ls "~1.1.2"
-
-typedarray@^0.0.6:
-  version "0.0.6"
-  resolved "https://registry.yarnpkg.com/typedarray/-/typedarray-0.0.6.tgz#867ac74e3864187b1d3d47d996a78ec5c8830777"
-
-unherit@^1.0.4:
-  version "1.1.1"
-  resolved "https://registry.yarnpkg.com/unherit/-/unherit-1.1.1.tgz#132748da3e88eab767e08fabfbb89c5e9d28628c"
-  dependencies:
-    inherits "^2.0.1"
-    xtend "^4.0.1"
-
-unified-args@^5.0.0:
-  version "5.1.0"
-  resolved "https://registry.yarnpkg.com/unified-args/-/unified-args-5.1.0.tgz#1889200e072998a662e6e84d817d6f4b5f448dd1"
-  dependencies:
-    camelcase "^4.0.0"
-    chalk "^2.0.0"
-    chokidar "^1.5.1"
-    json5 "^0.5.1"
-    minimist "^1.2.0"
-    text-table "^0.2.0"
-    unified-engine "^5.1.0"
-
-unified-engine@^5.1.0:
-  version "5.1.0"
-  resolved "https://registry.yarnpkg.com/unified-engine/-/unified-engine-5.1.0.tgz#30db83bcc76c821f773bb5a8a491aa0e2471e3d1"
-  dependencies:
-    concat-stream "^1.5.1"
-    debug "^3.1.0"
-    fault "^1.0.0"
-    fn-name "^2.0.1"
-    glob "^7.0.3"
-    ignore "^3.2.0"
-    is-empty "^1.0.0"
-    is-hidden "^1.0.1"
-    is-object "^1.0.1"
-    js-yaml "^3.6.1"
-    load-plugin "^2.0.0"
-    parse-json "^4.0.0"
-    to-vfile "^2.0.0"
-    trough "^1.0.0"
-    unist-util-inspect "^4.1.2"
-    vfile-reporter "^4.0.0"
-    vfile-statistics "^1.1.0"
-    x-is-function "^1.0.4"
-    x-is-string "^0.1.0"
-    xtend "^4.0.1"
-
-unified-lint-rule@^1.0.1:
-  version "1.0.3"
-  resolved "https://registry.yarnpkg.com/unified-lint-rule/-/unified-lint-rule-1.0.3.tgz#e302b0c4a7ac428c0980e049a500e59528001299"
-  dependencies:
-    wrapped "^1.0.1"
-
-unified@^6.0.0, unified@^6.1.6:
-  version "6.2.0"
-  resolved "https://registry.yarnpkg.com/unified/-/unified-6.2.0.tgz#7fbd630f719126d67d40c644b7e3f617035f6dba"
-  dependencies:
-    bail "^1.0.0"
-    extend "^3.0.0"
-    is-plain-obj "^1.1.0"
-    trough "^1.0.0"
-    vfile "^2.0.0"
-    x-is-string "^0.1.0"
-
-unique-concat@^0.2.2:
-  version "0.2.2"
-  resolved "https://registry.yarnpkg.com/unique-concat/-/unique-concat-0.2.2.tgz#9210f9bdcaacc5e1e3929490d7c019df96f18712"
-
-unist-util-inspect@^4.1.2:
-  version "4.1.3"
-  resolved "https://registry.yarnpkg.com/unist-util-inspect/-/unist-util-inspect-4.1.3.tgz#39470e6d77485db285966df78431219aa1287822"
-  dependencies:
-    is-empty "^1.0.0"
-
-unist-util-is@^2.1.2:
-  version "2.1.2"
-  resolved "https://registry.yarnpkg.com/unist-util-is/-/unist-util-is-2.1.2.tgz#1193fa8f2bfbbb82150633f3a8d2eb9a1c1d55db"
-
-unist-util-modify-children@^1.0.0:
-  version "1.1.2"
-  resolved "https://registry.yarnpkg.com/unist-util-modify-children/-/unist-util-modify-children-1.1.2.tgz#c7f1b91712554ee59c47a05b551ed3e052a4e2d1"
-  dependencies:
-    array-iterate "^1.0.0"
-
-unist-util-remove-position@^1.0.0:
-  version "1.1.2"
-  resolved "https://registry.yarnpkg.com/unist-util-remove-position/-/unist-util-remove-position-1.1.2.tgz#86b5dad104d0bbfbeb1db5f5c92f3570575c12cb"
-  dependencies:
-    unist-util-visit "^1.1.0"
-
-unist-util-stringify-position@^1.0.0, unist-util-stringify-position@^1.1.1:
-  version "1.1.2"
-  resolved "https://registry.yarnpkg.com/unist-util-stringify-position/-/unist-util-stringify-position-1.1.2.tgz#3f37fcf351279dcbca7480ab5889bb8a832ee1c6"
-
-unist-util-visit-parents@^2.0.0:
-  version "2.0.1"
-  resolved "https://registry.yarnpkg.com/unist-util-visit-parents/-/unist-util-visit-parents-2.0.1.tgz#63fffc8929027bee04bfef7d2cce474f71cb6217"
-  dependencies:
-    unist-util-is "^2.1.2"
-
-unist-util-visit@^1.1.0, unist-util-visit@^1.1.1, unist-util-visit@^1.1.3:
-  version "1.4.0"
-  resolved "https://registry.yarnpkg.com/unist-util-visit/-/unist-util-visit-1.4.0.tgz#1cb763647186dc26f5e1df5db6bd1e48b3cc2fb1"
-  dependencies:
-    unist-util-visit-parents "^2.0.0"
-
-untildify@^2.1.0:
-  version "2.1.0"
-  resolved "https://registry.yarnpkg.com/untildify/-/untildify-2.1.0.tgz#17eb2807987f76952e9c0485fc311d06a826a2e0"
-  dependencies:
-    os-homedir "^1.0.0"
-
-unzip-response@^2.0.1:
-  version "2.0.1"
-  resolved "https://registry.yarnpkg.com/unzip-response/-/unzip-response-2.0.1.tgz#d2f0f737d16b0615e72a6935ed04214572d56f97"
-
-url-parse-lax@^1.0.0:
-  version "1.0.0"
-  resolved "https://registry.yarnpkg.com/url-parse-lax/-/url-parse-lax-1.0.0.tgz#7af8f303645e9bd79a272e7a14ac68bc0609da73"
-  dependencies:
-    prepend-http "^1.0.1"
-
-url-parse-lax@^3.0.0:
-  version "3.0.0"
-  resolved "https://registry.yarnpkg.com/url-parse-lax/-/url-parse-lax-3.0.0.tgz#16b5cafc07dbe3676c1b1999177823d6503acb0c"
-  dependencies:
-    prepend-http "^2.0.0"
-
-url-to-options@^1.0.1:
-  version "1.0.1"
-  resolved "https://registry.yarnpkg.com/url-to-options/-/url-to-options-1.0.1.tgz#1505a03a289a48cbd7a434efbaeec5055f5633a9"
-
-util-deprecate@~1.0.1:
-  version "1.0.2"
-  resolved "https://registry.yarnpkg.com/util-deprecate/-/util-deprecate-1.0.2.tgz#450d4dc9fa70de732762fbd2d4a28981419a0ccf"
-
-uuid@^3.1.0:
-  version "3.3.2"
-  resolved "https://registry.yarnpkg.com/uuid/-/uuid-3.3.2.tgz#1b4af4955eb3077c501c23872fc6513811587131"
-
-validate-npm-package-license@^3.0.1:
-  version "3.0.4"
-  resolved "https://registry.yarnpkg.com/validate-npm-package-license/-/validate-npm-package-license-3.0.4.tgz#fc91f6b9c7ba15c857f4cb2c5defeec39d4f410a"
-  dependencies:
-    spdx-correct "^3.0.0"
-    spdx-expression-parse "^3.0.0"
-
-verror@1.10.0:
-  version "1.10.0"
-  resolved "https://registry.yarnpkg.com/verror/-/verror-1.10.0.tgz#3a105ca17053af55d6e270c1f8288682e18da400"
-  dependencies:
-    assert-plus "^1.0.0"
-    core-util-is "1.0.2"
-    extsprintf "^1.2.0"
-
-vfile-location@^2.0.0:
-  version "2.0.3"
-  resolved "https://registry.yarnpkg.com/vfile-location/-/vfile-location-2.0.3.tgz#083ba80e50968e8d420be49dd1ea9a992131df77"
-
-vfile-message@^1.0.0:
-  version "1.0.1"
-  resolved "https://registry.yarnpkg.com/vfile-message/-/vfile-message-1.0.1.tgz#51a2ccd8a6b97a7980bb34efb9ebde9632e93677"
-  dependencies:
-    unist-util-stringify-position "^1.1.1"
-
-vfile-reporter@^4.0.0:
-  version "4.0.0"
-  resolved "https://registry.yarnpkg.com/vfile-reporter/-/vfile-reporter-4.0.0.tgz#ea6f0ae1342f4841573985e05f941736f27de9da"
-  dependencies:
-    repeat-string "^1.5.0"
-    string-width "^1.0.0"
-    supports-color "^4.1.0"
-    unist-util-stringify-position "^1.0.0"
-    vfile-statistics "^1.1.0"
-
-vfile-statistics@^1.1.0:
-  version "1.1.1"
-  resolved "https://registry.yarnpkg.com/vfile-statistics/-/vfile-statistics-1.1.1.tgz#a22fd4eb844c9eaddd781ad3b3246db88375e2e3"
-
-vfile@^2.0.0:
-  version "2.3.0"
-  resolved "https://registry.yarnpkg.com/vfile/-/vfile-2.3.0.tgz#e62d8e72b20e83c324bc6c67278ee272488bf84a"
-  dependencies:
-    is-buffer "^1.1.4"
-    replace-ext "1.0.0"
-    unist-util-stringify-position "^1.0.0"
-    vfile-message "^1.0.0"
-
-weasel-words@^0.1.1:
-  version "0.1.1"
-  resolved "https://registry.yarnpkg.com/weasel-words/-/weasel-words-0.1.1.tgz#7137946585c73fe44882013853bd000c5d687a4e"
-
-wide-align@^1.1.0:
-  version "1.1.3"
-  resolved "https://registry.yarnpkg.com/wide-align/-/wide-align-1.1.3.tgz#ae074e6bdc0c14a431e804e624549c633b000457"
-  dependencies:
-    string-width "^1.0.2 || 2"
-
-wordwrap@~1.0.0:
-  version "1.0.0"
-  resolved "https://registry.yarnpkg.com/wordwrap/-/wordwrap-1.0.0.tgz#27584810891456a4171c8d0226441ade90cbcaeb"
-
-wrapped@^1.0.1:
-  version "1.0.1"
-  resolved "https://registry.yarnpkg.com/wrapped/-/wrapped-1.0.1.tgz#c783d9d807b273e9b01e851680a938c87c907242"
-  dependencies:
-    co "3.1.0"
-    sliced "^1.0.1"
-
-wrappy@1:
-  version "1.0.2"
-  resolved "https://registry.yarnpkg.com/wrappy/-/wrappy-1.0.2.tgz#b5243d8f3ec1aa35f1364605bc0d1036e30ab69f"
-
-write-good@^0.11.1:
-  version "0.11.3"
-  resolved "https://registry.yarnpkg.com/write-good/-/write-good-0.11.3.tgz#8eeb5da9a8e155dafb1325d27eba33cb67d24d8c"
-  dependencies:
-    adverb-where "0.0.9"
-    e-prime "^0.10.2"
-    no-cliches "^0.1.0"
-    object.assign "^4.0.4"
-    passive-voice "^0.1.0"
-    too-wordy "^0.1.4"
-    weasel-words "^0.1.1"
-
-write@^0.2.1:
-  version "0.2.1"
-  resolved "https://registry.yarnpkg.com/write/-/write-0.2.1.tgz#5fc03828e264cea3fe91455476f7a3c566cb0757"
-  dependencies:
-    mkdirp "^0.5.1"
-
-x-is-function@^1.0.4:
-  version "1.0.4"
-  resolved "https://registry.yarnpkg.com/x-is-function/-/x-is-function-1.0.4.tgz#5d294dc3d268cbdd062580e0c5df77a391d1fa1e"
-
-x-is-string@^0.1.0:
-  version "0.1.0"
-  resolved "https://registry.yarnpkg.com/x-is-string/-/x-is-string-0.1.0.tgz#474b50865af3a49a9c4657f05acd145458f77d82"
-
-xml-escape@^1.0.0:
-  version "1.1.0"
-  resolved "https://registry.yarnpkg.com/xml-escape/-/xml-escape-1.1.0.tgz#3904c143fa8eb3a0030ec646d2902a2f1b706c44"
-
-xtend@^4.0.1:
-  version "4.0.1"
-  resolved "https://registry.yarnpkg.com/xtend/-/xtend-4.0.1.tgz#a5c6d532be656e23db820efb943a1f04998d63af"
-
-yallist@^3.0.0, yallist@^3.0.2:
-  version "3.0.2"
-  resolved "https://registry.yarnpkg.com/yallist/-/yallist-3.0.2.tgz#8452b4bb7e83c7c188d8041c1a837c773d6d8bb9"
diff --git a/node/node.go b/node/node.go
index 993f1cd1c..128714cb9 100644
--- a/node/node.go
+++ b/node/node.go
@@ -7,6 +7,7 @@ import (
 	"net"
 	"net/http"
 	_ "net/http/pprof"
+	"os"
 	"strings"
 	"time"
 
@@ -86,8 +87,26 @@ func DefaultNewNode(config *cfg.Config, logger log.Logger) (*Node, error) {
 	if err != nil {
 		return nil, err
 	}
+
+	// Convert old PrivValidator if it exists.
+	oldPrivVal := config.OldPrivValidatorFile()
+	newPrivValKey := config.PrivValidatorKeyFile()
+	newPrivValState := config.PrivValidatorStateFile()
+	if _, err := os.Stat(oldPrivVal); !os.IsNotExist(err) {
+		oldPV, err := privval.LoadOldFilePV(oldPrivVal)
+		if err != nil {
+			return nil, fmt.Errorf("Error reading OldPrivValidator from %v: %v\n", oldPrivVal, err)
+		}
+		logger.Info("Upgrading PrivValidator file",
+			"old", oldPrivVal,
+			"newKey", newPrivValKey,
+			"newState", newPrivValState,
+		)
+		oldPV.Upgrade(newPrivValKey, newPrivValState)
+	}
+
 	return NewNode(config,
-		privval.LoadOrGenFilePV(config.PrivValidatorFile()),
+		privval.LoadOrGenFilePV(newPrivValKey, newPrivValState),
 		nodeKey,
 		proxy.DefaultClientCreator(config.ProxyApp, config.ABCI, config.DBDir()),
 		DefaultGenesisDocProviderFunc(config),
@@ -240,16 +259,19 @@ func NewNode(config *cfg.Config,
 	fastSync := config.FastSync
 	if state.Validators.Size() == 1 {
 		addr, _ := state.Validators.GetByIndex(0)
-		if bytes.Equal(privValidator.GetAddress(), addr) {
+		privValAddr := privValidator.GetPubKey().Address()
+		if bytes.Equal(privValAddr, addr) {
 			fastSync = false
 		}
 	}
 
+	pubKey := privValidator.GetPubKey()
+	addr := pubKey.Address()
 	// Log whether this node is a validator or an observer
-	if state.Validators.HasAddress(privValidator.GetAddress()) {
-		consensusLogger.Info("This node is a validator", "addr", privValidator.GetAddress(), "pubKey", privValidator.GetPubKey())
+	if state.Validators.HasAddress(addr) {
+		consensusLogger.Info("This node is a validator", "addr", addr, "pubKey", pubKey)
 	} else {
-		consensusLogger.Info("This node is not a validator", "addr", privValidator.GetAddress(), "pubKey", privValidator.GetPubKey())
+		consensusLogger.Info("This node is not a validator", "addr", addr, "pubKey", pubKey)
 	}
 
 	csMetrics, p2pMetrics, memplMetrics, smMetrics := metricsProvider()
@@ -617,7 +639,8 @@ func (n *Node) ConfigureRPC() {
 	rpccore.SetEvidencePool(n.evidencePool)
 	rpccore.SetP2PPeers(n.sw)
 	rpccore.SetP2PTransport(n)
-	rpccore.SetPubKey(n.privValidator.GetPubKey())
+	pubKey := n.privValidator.GetPubKey()
+	rpccore.SetPubKey(pubKey)
 	rpccore.SetGenesisDoc(n.genesisDoc)
 	rpccore.SetAddrBook(n.addrBook)
 	rpccore.SetProxyAppQuery(n.proxyApp.Query())
@@ -855,16 +878,20 @@ func createAndStartPrivValidatorSocketClient(
 	listenAddr string,
 	logger log.Logger,
 ) (types.PrivValidator, error) {
-	var pvsc types.PrivValidator
+	var listener net.Listener
 
 	protocol, address := cmn.ProtocolAndAddress(listenAddr)
+	ln, err := net.Listen(protocol, address)
+	if err != nil {
+		return nil, err
+	}
 	switch protocol {
 	case "unix":
-		pvsc = privval.NewIPCVal(logger.With("module", "privval"), address)
+		listener = privval.NewUnixListener(ln)
 	case "tcp":
 		// TODO: persist this key so external signer
 		// can actually authenticate us
-		pvsc = privval.NewTCPVal(logger.With("module", "privval"), listenAddr, ed25519.GenPrivKey())
+		listener = privval.NewTCPListener(ln, ed25519.GenPrivKey())
 	default:
 		return nil, fmt.Errorf(
 			"Wrong listen address: expected either 'tcp' or 'unix' protocols, got %s",
@@ -872,10 +899,9 @@ func createAndStartPrivValidatorSocketClient(
 		)
 	}
 
-	if pvsc, ok := pvsc.(cmn.Service); ok {
-		if err := pvsc.Start(); err != nil {
-			return nil, errors.Wrap(err, "failed to start")
-		}
+	pvsc := privval.NewSocketVal(logger.With("module", "privval"), listener)
+	if err := pvsc.Start(); err != nil {
+		return nil, errors.Wrap(err, "failed to start private validator")
 	}
 
 	return pvsc, nil
diff --git a/node/node_test.go b/node/node_test.go
index e675eb9a8..96d779d40 100644
--- a/node/node_test.go
+++ b/node/node_test.go
@@ -122,25 +122,25 @@ func TestNodeSetPrivValTCP(t *testing.T) {
 	config := cfg.ResetTestRoot("node_priv_val_tcp_test")
 	config.BaseConfig.PrivValidatorListenAddr = addr
 
-	rs := privval.NewRemoteSigner(
+	dialer := privval.DialTCPFn(addr, 100*time.Millisecond, ed25519.GenPrivKey())
+	pvsc := privval.NewRemoteSigner(
 		log.TestingLogger(),
 		config.ChainID(),
-		addr,
 		types.NewMockPV(),
-		ed25519.GenPrivKey(),
+		dialer,
 	)
-	privval.RemoteSignerConnDeadline(5 * time.Millisecond)(rs)
+
 	go func() {
-		err := rs.Start()
+		err := pvsc.Start()
 		if err != nil {
 			panic(err)
 		}
 	}()
-	defer rs.Stop()
+	defer pvsc.Stop()
 
 	n, err := DefaultNewNode(config, log.TestingLogger())
 	require.NoError(t, err)
-	assert.IsType(t, &privval.TCPVal{}, n.PrivValidator())
+	assert.IsType(t, &privval.SocketVal{}, n.PrivValidator())
 }
 
 // address without a protocol must result in error
@@ -161,25 +161,25 @@ func TestNodeSetPrivValIPC(t *testing.T) {
 	config := cfg.ResetTestRoot("node_priv_val_tcp_test")
 	config.BaseConfig.PrivValidatorListenAddr = "unix://" + tmpfile
 
-	rs := privval.NewIPCRemoteSigner(
+	dialer := privval.DialUnixFn(tmpfile)
+	pvsc := privval.NewRemoteSigner(
 		log.TestingLogger(),
 		config.ChainID(),
-		tmpfile,
 		types.NewMockPV(),
+		dialer,
 	)
-	privval.IPCRemoteSignerConnDeadline(3 * time.Second)(rs)
 
 	done := make(chan struct{})
 	go func() {
 		defer close(done)
 		n, err := DefaultNewNode(config, log.TestingLogger())
 		require.NoError(t, err)
-		assert.IsType(t, &privval.IPCVal{}, n.PrivValidator())
+		assert.IsType(t, &privval.SocketVal{}, n.PrivValidator())
 	}()
 
-	err := rs.Start()
+	err := pvsc.Start()
 	require.NoError(t, err)
-	defer rs.Stop()
+	defer pvsc.Stop()
 
 	<-done
 }
diff --git a/p2p/README.md b/p2p/README.md
index 819a5056b..df4c2ae01 100644
--- a/p2p/README.md
+++ b/p2p/README.md
@@ -4,8 +4,8 @@ The p2p package provides an abstraction around peer-to-peer communication.
 
 Docs:
 
-- [Connection](https://github.com/tendermint/tendermint/blob/master/docs/spec/docs/spec/p2p/connection.md) for details on how connections and multiplexing work
-- [Peer](https://github.com/tendermint/tendermint/blob/master/docs/spec/docs/spec/p2p/peer.md) for details on peer ID, handshakes, and peer exchange
-- [Node](https://github.com/tendermint/tendermint/blob/master/docs/spec/docs/spec/p2p/node.md) for details about different types of nodes and how they should work
-- [Pex](https://github.com/tendermint/tendermint/blob/master/docs/spec/docs/spec/reactors/pex/pex.md) for details on peer discovery and exchange
-- [Config](https://github.com/tendermint/tendermint/blob/master/docs/spec/docs/spec/p2p/config.md) for details on some config option
+- [Connection](https://github.com/tendermint/tendermint/blob/master/docs/spec/p2p/connection.md) for details on how connections and multiplexing work
+- [Peer](https://github.com/tendermint/tendermint/blob/master/docs/spec/p2p/peer.md) for details on peer ID, handshakes, and peer exchange
+- [Node](https://github.com/tendermint/tendermint/blob/master/docs/spec/p2p/node.md) for details about different types of nodes and how they should work
+- [Pex](https://github.com/tendermint/tendermint/blob/master/docs/spec/reactors/pex/pex.md) for details on peer discovery and exchange
+- [Config](https://github.com/tendermint/tendermint/blob/master/docs/spec/p2p/config.md) for details on some config option
diff --git a/p2p/conn/secret_connection.go b/p2p/conn/secret_connection.go
index d1b6bce6c..aa019aa31 100644
--- a/p2p/conn/secret_connection.go
+++ b/p2p/conn/secret_connection.go
@@ -8,6 +8,7 @@ import (
 	"errors"
 	"io"
 	"net"
+	"sync"
 	"time"
 
 	"golang.org/x/crypto/chacha20poly1305"
@@ -27,20 +28,36 @@ const aeadSizeOverhead = 16 // overhead of poly 1305 authentication tag
 const aeadKeySize = chacha20poly1305.KeySize
 const aeadNonceSize = chacha20poly1305.NonceSize
 
-// SecretConnection implements net.conn.
+// SecretConnection implements net.Conn.
 // It is an implementation of the STS protocol.
-// Note we do not (yet) assume that a remote peer's pubkey
-// is known ahead of time, and thus we are technically
-// still vulnerable to MITM. (TODO!)
-// See docs/sts-final.pdf for more info
+// See https://github.com/tendermint/tendermint/blob/0.1/docs/sts-final.pdf for
+// details on the protocol.
+//
+// Consumers of the SecretConnection are responsible for authenticating
+// the remote peer's pubkey against known information, like a nodeID.
+// Otherwise they are vulnerable to MITM.
+// (TODO(ismail): see also https://github.com/tendermint/tendermint/issues/3010)
 type SecretConnection struct {
-	conn       io.ReadWriteCloser
-	recvBuffer []byte
-	recvNonce  *[aeadNonceSize]byte
-	sendNonce  *[aeadNonceSize]byte
+
+	// immutable
 	recvSecret *[aeadKeySize]byte
 	sendSecret *[aeadKeySize]byte
 	remPubKey  crypto.PubKey
+	conn       io.ReadWriteCloser
+
+	// net.Conn must be thread safe:
+	// https://golang.org/pkg/net/#Conn.
+	// Since we have internal mutable state,
+	// we need mtxs. But recv and send states
+	// are independent, so we can use two mtxs.
+	// All .Read are covered by recvMtx,
+	// all .Write are covered by sendMtx.
+	recvMtx    sync.Mutex
+	recvBuffer []byte
+	recvNonce  *[aeadNonceSize]byte
+
+	sendMtx   sync.Mutex
+	sendNonce *[aeadNonceSize]byte
 }
 
 // MakeSecretConnection performs handshake and returns a new authenticated
@@ -109,9 +126,12 @@ func (sc *SecretConnection) RemotePubKey() crypto.PubKey {
 	return sc.remPubKey
 }
 
-// Writes encrypted frames of `sealedFrameSize`
-// CONTRACT: data smaller than dataMaxSize is read atomically.
+// Writes encrypted frames of `totalFrameSize + aeadSizeOverhead`.
+// CONTRACT: data smaller than dataMaxSize is written atomically.
 func (sc *SecretConnection) Write(data []byte) (n int, err error) {
+	sc.sendMtx.Lock()
+	defer sc.sendMtx.Unlock()
+
 	for 0 < len(data) {
 		var frame = make([]byte, totalFrameSize)
 		var chunk []byte
@@ -130,6 +150,7 @@ func (sc *SecretConnection) Write(data []byte) (n int, err error) {
 		if err != nil {
 			return n, errors.New("Invalid SecretConnection Key")
 		}
+
 		// encrypt the frame
 		var sealedFrame = make([]byte, aeadSizeOverhead+totalFrameSize)
 		aead.Seal(sealedFrame[:0], sc.sendNonce[:], frame, nil)
@@ -147,23 +168,30 @@ func (sc *SecretConnection) Write(data []byte) (n int, err error) {
 
 // CONTRACT: data smaller than dataMaxSize is read atomically.
 func (sc *SecretConnection) Read(data []byte) (n int, err error) {
+	sc.recvMtx.Lock()
+	defer sc.recvMtx.Unlock()
+
+	// read off and update the recvBuffer, if non-empty
 	if 0 < len(sc.recvBuffer) {
 		n = copy(data, sc.recvBuffer)
 		sc.recvBuffer = sc.recvBuffer[n:]
 		return
 	}
 
-	aead, err := chacha20poly1305.New(sc.recvSecret[:])
-	if err != nil {
-		return n, errors.New("Invalid SecretConnection Key")
-	}
+	// read off the conn
 	sealedFrame := make([]byte, totalFrameSize+aeadSizeOverhead)
 	_, err = io.ReadFull(sc.conn, sealedFrame)
 	if err != nil {
 		return
 	}
 
-	// decrypt the frame
+	aead, err := chacha20poly1305.New(sc.recvSecret[:])
+	if err != nil {
+		return n, errors.New("Invalid SecretConnection Key")
+	}
+
+	// decrypt the frame.
+	// reads and updates the sc.recvNonce
 	var frame = make([]byte, totalFrameSize)
 	_, err = aead.Open(frame[:0], sc.recvNonce[:], sealedFrame, nil)
 	if err != nil {
@@ -172,12 +200,13 @@ func (sc *SecretConnection) Read(data []byte) (n int, err error) {
 	incrNonce(sc.recvNonce)
 	// end decryption
 
+	// copy checkLength worth into data,
+	// set recvBuffer to the rest.
 	var chunkLength = binary.LittleEndian.Uint32(frame) // read the first four bytes
 	if chunkLength > dataMaxSize {
 		return 0, errors.New("chunkLength is greater than dataMaxSize")
 	}
 	var chunk = frame[dataLenSize : dataLenSize+chunkLength]
-
 	n = copy(data, chunk)
 	sc.recvBuffer = chunk[n:]
 	return
diff --git a/p2p/conn/secret_connection_test.go b/p2p/conn/secret_connection_test.go
index 75ed8fe02..131ab9229 100644
--- a/p2p/conn/secret_connection_test.go
+++ b/p2p/conn/secret_connection_test.go
@@ -7,10 +7,12 @@ import (
 	"fmt"
 	"io"
 	"log"
+	"net"
 	"os"
 	"path/filepath"
 	"strconv"
 	"strings"
+	"sync"
 	"testing"
 
 	"github.com/stretchr/testify/assert"
@@ -98,6 +100,69 @@ func TestSecretConnectionHandshake(t *testing.T) {
 	}
 }
 
+func TestConcurrentWrite(t *testing.T) {
+	fooSecConn, barSecConn := makeSecretConnPair(t)
+	fooWriteText := cmn.RandStr(dataMaxSize)
+
+	// write from two routines.
+	// should be safe from race according to net.Conn:
+	// https://golang.org/pkg/net/#Conn
+	n := 100
+	wg := new(sync.WaitGroup)
+	wg.Add(3)
+	go writeLots(t, wg, fooSecConn, fooWriteText, n)
+	go writeLots(t, wg, fooSecConn, fooWriteText, n)
+
+	// Consume reads from bar's reader
+	readLots(t, wg, barSecConn, n*2)
+	wg.Wait()
+
+	if err := fooSecConn.Close(); err != nil {
+		t.Error(err)
+	}
+}
+
+func TestConcurrentRead(t *testing.T) {
+	fooSecConn, barSecConn := makeSecretConnPair(t)
+	fooWriteText := cmn.RandStr(dataMaxSize)
+	n := 100
+
+	// read from two routines.
+	// should be safe from race according to net.Conn:
+	// https://golang.org/pkg/net/#Conn
+	wg := new(sync.WaitGroup)
+	wg.Add(3)
+	go readLots(t, wg, fooSecConn, n/2)
+	go readLots(t, wg, fooSecConn, n/2)
+
+	// write to bar
+	writeLots(t, wg, barSecConn, fooWriteText, n)
+	wg.Wait()
+
+	if err := fooSecConn.Close(); err != nil {
+		t.Error(err)
+	}
+}
+
+func writeLots(t *testing.T, wg *sync.WaitGroup, conn net.Conn, txt string, n int) {
+	defer wg.Done()
+	for i := 0; i < n; i++ {
+		_, err := conn.Write([]byte(txt))
+		if err != nil {
+			t.Fatalf("Failed to write to fooSecConn: %v", err)
+		}
+	}
+}
+
+func readLots(t *testing.T, wg *sync.WaitGroup, conn net.Conn, n int) {
+	readBuffer := make([]byte, dataMaxSize)
+	for i := 0; i < n; i++ {
+		_, err := conn.Read(readBuffer)
+		assert.NoError(t, err)
+	}
+	wg.Done()
+}
+
 func TestSecretConnectionReadWrite(t *testing.T) {
 	fooConn, barConn := makeKVStoreConnPair()
 	fooWrites, barWrites := []string{}, []string{}
diff --git a/p2p/node_info.go b/p2p/node_info.go
index 3e02e9c18..699fd7f1e 100644
--- a/p2p/node_info.go
+++ b/p2p/node_info.go
@@ -9,7 +9,7 @@ import (
 )
 
 const (
-	maxNodeInfoSize = 10240 // 10Kb
+	maxNodeInfoSize = 10240 // 10KB
 	maxNumChannels  = 16    // plenty of room for upgrades, for now
 )
 
diff --git a/privval/client.go b/privval/client.go
new file mode 100644
index 000000000..1ad104d8d
--- /dev/null
+++ b/privval/client.go
@@ -0,0 +1,238 @@
+package privval
+
+import (
+	"errors"
+	"fmt"
+	"net"
+	"sync"
+	"time"
+
+	"github.com/tendermint/tendermint/crypto"
+	cmn "github.com/tendermint/tendermint/libs/common"
+	"github.com/tendermint/tendermint/libs/log"
+	"github.com/tendermint/tendermint/types"
+)
+
+const (
+	defaultConnHeartBeatSeconds = 2
+	defaultDialRetries          = 10
+)
+
+// Socket errors.
+var (
+	ErrUnexpectedResponse = errors.New("received unexpected response")
+)
+
+var (
+	connHeartbeat = time.Second * defaultConnHeartBeatSeconds
+)
+
+// SocketValOption sets an optional parameter on the SocketVal.
+type SocketValOption func(*SocketVal)
+
+// SocketValHeartbeat sets the period on which to check the liveness of the
+// connected Signer connections.
+func SocketValHeartbeat(period time.Duration) SocketValOption {
+	return func(sc *SocketVal) { sc.connHeartbeat = period }
+}
+
+// SocketVal implements PrivValidator.
+// It listens for an external process to dial in and uses
+// the socket to request signatures.
+type SocketVal struct {
+	cmn.BaseService
+
+	listener net.Listener
+
+	// ping
+	cancelPing    chan struct{}
+	pingTicker    *time.Ticker
+	connHeartbeat time.Duration
+
+	// signer is mutable since it can be
+	// reset if the connection fails.
+	// failures are detected by a background
+	// ping routine.
+	// Methods on the underlying net.Conn itself
+	// are already gorountine safe.
+	mtx    sync.RWMutex
+	signer *RemoteSignerClient
+}
+
+// Check that SocketVal implements PrivValidator.
+var _ types.PrivValidator = (*SocketVal)(nil)
+
+// NewSocketVal returns an instance of SocketVal.
+func NewSocketVal(
+	logger log.Logger,
+	listener net.Listener,
+) *SocketVal {
+	sc := &SocketVal{
+		listener:      listener,
+		connHeartbeat: connHeartbeat,
+	}
+
+	sc.BaseService = *cmn.NewBaseService(logger, "SocketVal", sc)
+
+	return sc
+}
+
+//--------------------------------------------------------
+// Implement PrivValidator
+
+// GetPubKey implements PrivValidator.
+func (sc *SocketVal) GetPubKey() crypto.PubKey {
+	sc.mtx.RLock()
+	defer sc.mtx.RUnlock()
+	return sc.signer.GetPubKey()
+}
+
+// SignVote implements PrivValidator.
+func (sc *SocketVal) SignVote(chainID string, vote *types.Vote) error {
+	sc.mtx.RLock()
+	defer sc.mtx.RUnlock()
+	return sc.signer.SignVote(chainID, vote)
+}
+
+// SignProposal implements PrivValidator.
+func (sc *SocketVal) SignProposal(chainID string, proposal *types.Proposal) error {
+	sc.mtx.RLock()
+	defer sc.mtx.RUnlock()
+	return sc.signer.SignProposal(chainID, proposal)
+}
+
+//--------------------------------------------------------
+// More thread safe methods proxied to the signer
+
+// Ping is used to check connection health.
+func (sc *SocketVal) Ping() error {
+	sc.mtx.RLock()
+	defer sc.mtx.RUnlock()
+	return sc.signer.Ping()
+}
+
+// Close closes the underlying net.Conn.
+func (sc *SocketVal) Close() {
+	sc.mtx.RLock()
+	defer sc.mtx.RUnlock()
+	if sc.signer != nil {
+		if err := sc.signer.Close(); err != nil {
+			sc.Logger.Error("OnStop", "err", err)
+		}
+	}
+
+	if sc.listener != nil {
+		if err := sc.listener.Close(); err != nil {
+			sc.Logger.Error("OnStop", "err", err)
+		}
+	}
+}
+
+//--------------------------------------------------------
+// Service start and stop
+
+// OnStart implements cmn.Service.
+func (sc *SocketVal) OnStart() error {
+	if closed, err := sc.reset(); err != nil {
+		sc.Logger.Error("OnStart", "err", err)
+		return err
+	} else if closed {
+		return fmt.Errorf("listener is closed")
+	}
+
+	// Start a routine to keep the connection alive
+	sc.cancelPing = make(chan struct{}, 1)
+	sc.pingTicker = time.NewTicker(sc.connHeartbeat)
+	go func() {
+		for {
+			select {
+			case <-sc.pingTicker.C:
+				err := sc.Ping()
+				if err != nil {
+					sc.Logger.Error("Ping", "err", err)
+					if err == ErrUnexpectedResponse {
+						return
+					}
+
+					closed, err := sc.reset()
+					if err != nil {
+						sc.Logger.Error("Reconnecting to remote signer failed", "err", err)
+						continue
+					}
+					if closed {
+						sc.Logger.Info("listener is closing")
+						return
+					}
+
+					sc.Logger.Info("Re-created connection to remote signer", "impl", sc)
+				}
+			case <-sc.cancelPing:
+				sc.pingTicker.Stop()
+				return
+			}
+		}
+	}()
+
+	return nil
+}
+
+// OnStop implements cmn.Service.
+func (sc *SocketVal) OnStop() {
+	if sc.cancelPing != nil {
+		close(sc.cancelPing)
+	}
+	sc.Close()
+}
+
+//--------------------------------------------------------
+// Connection and signer management
+
+// waits to accept and sets a new connection.
+// connection is closed in OnStop.
+// returns true if the listener is closed
+// (ie. it returns a nil conn).
+func (sc *SocketVal) reset() (closed bool, err error) {
+	sc.mtx.Lock()
+	defer sc.mtx.Unlock()
+
+	// first check if the conn already exists and close it.
+	if sc.signer != nil {
+		if err := sc.signer.Close(); err != nil {
+			sc.Logger.Error("error closing socket val connection during reset", "err", err)
+		}
+	}
+
+	// wait for a new conn
+	conn, err := sc.acceptConnection()
+	if err != nil {
+		return false, err
+	}
+
+	// listener is closed
+	if conn == nil {
+		return true, nil
+	}
+
+	sc.signer, err = NewRemoteSignerClient(conn)
+	if err != nil {
+		// failed to fetch the pubkey. close out the connection.
+		if err := conn.Close(); err != nil {
+			sc.Logger.Error("error closing connection", "err", err)
+		}
+		return false, err
+	}
+	return false, nil
+}
+
+// Attempt to accept a connection.
+// Times out after the listener's acceptDeadline
+func (sc *SocketVal) acceptConnection() (net.Conn, error) {
+	conn, err := sc.listener.Accept()
+	if err != nil {
+		if !sc.IsRunning() {
+			return nil, nil // Ignore error from listener closing.
+		}
+		return nil, err
+	}
+	return conn, nil
+}
diff --git a/privval/client_test.go b/privval/client_test.go
new file mode 100644
index 000000000..3c3270649
--- /dev/null
+++ b/privval/client_test.go
@@ -0,0 +1,466 @@
+package privval
+
+import (
+	"fmt"
+	"net"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+
+	"github.com/tendermint/tendermint/crypto/ed25519"
+	cmn "github.com/tendermint/tendermint/libs/common"
+	"github.com/tendermint/tendermint/libs/log"
+
+	p2pconn "github.com/tendermint/tendermint/p2p/conn"
+	"github.com/tendermint/tendermint/types"
+)
+
+var (
+	testAcceptDeadline = defaultAcceptDeadlineSeconds * time.Second
+
+	testConnDeadline    = 100 * time.Millisecond
+	testConnDeadline2o3 = 66 * time.Millisecond // 2/3 of the other one
+
+	testHeartbeatTimeout    = 10 * time.Millisecond
+	testHeartbeatTimeout3o2 = 6 * time.Millisecond // 3/2 of the other one
+)
+
+type socketTestCase struct {
+	addr   string
+	dialer Dialer
+}
+
+func socketTestCases(t *testing.T) []socketTestCase {
+	tcpAddr := fmt.Sprintf("tcp://%s", testFreeTCPAddr(t))
+	unixFilePath, err := testUnixAddr()
+	require.NoError(t, err)
+	unixAddr := fmt.Sprintf("unix://%s", unixFilePath)
+	return []socketTestCase{
+		socketTestCase{
+			addr:   tcpAddr,
+			dialer: DialTCPFn(tcpAddr, testConnDeadline, ed25519.GenPrivKey()),
+		},
+		socketTestCase{
+			addr:   unixAddr,
+			dialer: DialUnixFn(unixFilePath),
+		},
+	}
+}
+
+func TestSocketPVAddress(t *testing.T) {
+	for _, tc := range socketTestCases(t) {
+		// Execute the test within a closure to ensure the deferred statements
+		// are called between each for loop iteration, for isolated test cases.
+		func() {
+			var (
+				chainID = cmn.RandStr(12)
+				sc, rs  = testSetupSocketPair(t, chainID, types.NewMockPV(), tc.addr, tc.dialer)
+			)
+			defer sc.Stop()
+			defer rs.Stop()
+
+			serverAddr := rs.privVal.GetPubKey().Address()
+			clientAddr := sc.GetPubKey().Address()
+
+			assert.Equal(t, serverAddr, clientAddr)
+		}()
+	}
+}
+
+func TestSocketPVPubKey(t *testing.T) {
+	for _, tc := range socketTestCases(t) {
+		func() {
+			var (
+				chainID = cmn.RandStr(12)
+				sc, rs  = testSetupSocketPair(t, chainID, types.NewMockPV(), tc.addr, tc.dialer)
+			)
+			defer sc.Stop()
+			defer rs.Stop()
+
+			clientKey := sc.GetPubKey()
+
+			privvalPubKey := rs.privVal.GetPubKey()
+
+			assert.Equal(t, privvalPubKey, clientKey)
+		}()
+	}
+}
+
+func TestSocketPVProposal(t *testing.T) {
+	for _, tc := range socketTestCases(t) {
+		func() {
+			var (
+				chainID = cmn.RandStr(12)
+				sc, rs  = testSetupSocketPair(t, chainID, types.NewMockPV(), tc.addr, tc.dialer)
+
+				ts             = time.Now()
+				privProposal   = &types.Proposal{Timestamp: ts}
+				clientProposal = &types.Proposal{Timestamp: ts}
+			)
+			defer sc.Stop()
+			defer rs.Stop()
+
+			require.NoError(t, rs.privVal.SignProposal(chainID, privProposal))
+			require.NoError(t, sc.SignProposal(chainID, clientProposal))
+			assert.Equal(t, privProposal.Signature, clientProposal.Signature)
+		}()
+	}
+}
+
+func TestSocketPVVote(t *testing.T) {
+	for _, tc := range socketTestCases(t) {
+		func() {
+			var (
+				chainID = cmn.RandStr(12)
+				sc, rs  = testSetupSocketPair(t, chainID, types.NewMockPV(), tc.addr, tc.dialer)
+
+				ts    = time.Now()
+				vType = types.PrecommitType
+				want  = &types.Vote{Timestamp: ts, Type: vType}
+				have  = &types.Vote{Timestamp: ts, Type: vType}
+			)
+			defer sc.Stop()
+			defer rs.Stop()
+
+			require.NoError(t, rs.privVal.SignVote(chainID, want))
+			require.NoError(t, sc.SignVote(chainID, have))
+			assert.Equal(t, want.Signature, have.Signature)
+		}()
+	}
+}
+
+func TestSocketPVVoteResetDeadline(t *testing.T) {
+	for _, tc := range socketTestCases(t) {
+		func() {
+			var (
+				chainID = cmn.RandStr(12)
+				sc, rs  = testSetupSocketPair(t, chainID, types.NewMockPV(), tc.addr, tc.dialer)
+
+				ts    = time.Now()
+				vType = types.PrecommitType
+				want  = &types.Vote{Timestamp: ts, Type: vType}
+				have  = &types.Vote{Timestamp: ts, Type: vType}
+			)
+			defer sc.Stop()
+			defer rs.Stop()
+
+			time.Sleep(testConnDeadline2o3)
+
+			require.NoError(t, rs.privVal.SignVote(chainID, want))
+			require.NoError(t, sc.SignVote(chainID, have))
+			assert.Equal(t, want.Signature, have.Signature)
+
+			// This would exceed the deadline if it was not extended by the previous message
+			time.Sleep(testConnDeadline2o3)
+
+			require.NoError(t, rs.privVal.SignVote(chainID, want))
+			require.NoError(t, sc.SignVote(chainID, have))
+			assert.Equal(t, want.Signature, have.Signature)
+		}()
+	}
+}
+
+func TestSocketPVVoteKeepalive(t *testing.T) {
+	for _, tc := range socketTestCases(t) {
+		func() {
+			var (
+				chainID = cmn.RandStr(12)
+				sc, rs  = testSetupSocketPair(t, chainID, types.NewMockPV(), tc.addr, tc.dialer)
+
+				ts    = time.Now()
+				vType = types.PrecommitType
+				want  = &types.Vote{Timestamp: ts, Type: vType}
+				have  = &types.Vote{Timestamp: ts, Type: vType}
+			)
+			defer sc.Stop()
+			defer rs.Stop()
+
+			time.Sleep(testConnDeadline * 2)
+
+			require.NoError(t, rs.privVal.SignVote(chainID, want))
+			require.NoError(t, sc.SignVote(chainID, have))
+			assert.Equal(t, want.Signature, have.Signature)
+		}()
+	}
+}
+
+// TestSocketPVDeadlineTCPOnly is not relevant to Unix domain sockets, since the
+// OS knows instantaneously the state of both sides of the connection.
+func TestSocketPVDeadlineTCPOnly(t *testing.T) {
+	var (
+		addr            = testFreeTCPAddr(t)
+		listenc         = make(chan struct{})
+		thisConnTimeout = 100 * time.Millisecond
+		sc              = newSocketVal(log.TestingLogger(), addr, thisConnTimeout)
+	)
+
+	go func(sc *SocketVal) {
+		defer close(listenc)
+
+		assert.Equal(t, sc.Start().(cmn.Error).Data(), ErrConnTimeout)
+
+		assert.False(t, sc.IsRunning())
+	}(sc)
+
+	for {
+		conn, err := cmn.Connect(addr)
+		if err != nil {
+			continue
+		}
+
+		_, err = p2pconn.MakeSecretConnection(
+			conn,
+			ed25519.GenPrivKey(),
+		)
+		if err == nil {
+			break
+		}
+	}
+
+	<-listenc
+}
+
+func TestRemoteSignVoteErrors(t *testing.T) {
+	for _, tc := range socketTestCases(t) {
+		func() {
+			var (
+				chainID = cmn.RandStr(12)
+				sc, rs  = testSetupSocketPair(t, chainID, types.NewErroringMockPV(), tc.addr, tc.dialer)
+
+				ts    = time.Now()
+				vType = types.PrecommitType
+				vote  = &types.Vote{Timestamp: ts, Type: vType}
+			)
+			defer sc.Stop()
+			defer rs.Stop()
+
+			err := sc.SignVote("", vote)
+			require.Equal(t, err.(*RemoteSignerError).Description, types.ErroringMockPVErr.Error())
+
+			err = rs.privVal.SignVote(chainID, vote)
+			require.Error(t, err)
+			err = sc.SignVote(chainID, vote)
+			require.Error(t, err)
+		}()
+	}
+}
+
+func TestRemoteSignProposalErrors(t *testing.T) {
+	for _, tc := range socketTestCases(t) {
+		func() {
+			var (
+				chainID = cmn.RandStr(12)
+				sc, rs  = testSetupSocketPair(t, chainID, types.NewErroringMockPV(), tc.addr, tc.dialer)
+
+				ts       = time.Now()
+				proposal = &types.Proposal{Timestamp: ts}
+			)
+			defer sc.Stop()
+			defer rs.Stop()
+
+			err := sc.SignProposal("", proposal)
+			require.Equal(t, err.(*RemoteSignerError).Description, types.ErroringMockPVErr.Error())
+
+			err = rs.privVal.SignProposal(chainID, proposal)
+			require.Error(t, err)
+
+			err = sc.SignProposal(chainID, proposal)
+			require.Error(t, err)
+		}()
+	}
+}
+
+func TestErrUnexpectedResponse(t *testing.T) {
+	for _, tc := range socketTestCases(t) {
+		func() {
+			var (
+				logger  = log.TestingLogger()
+				chainID = cmn.RandStr(12)
+				readyc  = make(chan struct{})
+				errc    = make(chan error, 1)
+
+				rs = NewRemoteSigner(
+					logger,
+					chainID,
+					types.NewMockPV(),
+					tc.dialer,
+				)
+				sc = newSocketVal(logger, tc.addr, testConnDeadline)
+			)
+
+			testStartSocketPV(t, readyc, sc)
+			defer sc.Stop()
+			RemoteSignerConnDeadline(time.Millisecond)(rs)
+			RemoteSignerConnRetries(100)(rs)
+			// we do not want to Start() the remote signer here and instead use the connection to
+			// reply with intentionally wrong replies below:
+			rsConn, err := rs.connect()
+			defer rsConn.Close()
+			require.NoError(t, err)
+			require.NotNil(t, rsConn)
+			// send over public key to get the remote signer running:
+			go testReadWriteResponse(t, &PubKeyResponse{}, rsConn)
+			<-readyc
+
+			// Proposal:
+			go func(errc chan error) {
+				errc <- sc.SignProposal(chainID, &types.Proposal{})
+			}(errc)
+			// read request and write wrong response:
+			go testReadWriteResponse(t, &SignedVoteResponse{}, rsConn)
+			err = <-errc
+			require.Error(t, err)
+			require.Equal(t, err, ErrUnexpectedResponse)
+
+			// Vote:
+			go func(errc chan error) {
+				errc <- sc.SignVote(chainID, &types.Vote{})
+			}(errc)
+			// read request and write wrong response:
+			go testReadWriteResponse(t, &SignedProposalResponse{}, rsConn)
+			err = <-errc
+			require.Error(t, err)
+			require.Equal(t, err, ErrUnexpectedResponse)
+		}()
+	}
+}
+
+func TestRetryConnToRemoteSigner(t *testing.T) {
+	for _, tc := range socketTestCases(t) {
+		func() {
+			var (
+				logger  = log.TestingLogger()
+				chainID = cmn.RandStr(12)
+				readyc  = make(chan struct{})
+
+				rs = NewRemoteSigner(
+					logger,
+					chainID,
+					types.NewMockPV(),
+					tc.dialer,
+				)
+				thisConnTimeout = testConnDeadline
+				sc              = newSocketVal(logger, tc.addr, thisConnTimeout)
+			)
+			// Ping every:
+			SocketValHeartbeat(testHeartbeatTimeout)(sc)
+
+			RemoteSignerConnDeadline(testConnDeadline)(rs)
+			RemoteSignerConnRetries(10)(rs)
+
+			testStartSocketPV(t, readyc, sc)
+			defer sc.Stop()
+			require.NoError(t, rs.Start())
+			assert.True(t, rs.IsRunning())
+
+			<-readyc
+			time.Sleep(testHeartbeatTimeout * 2)
+
+			rs.Stop()
+			rs2 := NewRemoteSigner(
+				logger,
+				chainID,
+				types.NewMockPV(),
+				tc.dialer,
+			)
+			// let some pings pass
+			time.Sleep(testHeartbeatTimeout3o2)
+			require.NoError(t, rs2.Start())
+			assert.True(t, rs2.IsRunning())
+			defer rs2.Stop()
+
+			// give the client some time to re-establish the conn to the remote signer
+			// should see sth like this in the logs:
+			//
+			// E[10016-01-10|17:12:46.128] Ping                                         err="remote signer timed out"
+			// I[10016-01-10|17:16:42.447] Re-created connection to remote signer       impl=SocketVal
+			time.Sleep(testConnDeadline * 2)
+		}()
+	}
+}
+
+func newSocketVal(logger log.Logger, addr string, connDeadline time.Duration) *SocketVal {
+	proto, address := cmn.ProtocolAndAddress(addr)
+	ln, err := net.Listen(proto, address)
+	logger.Info("Listening at", "proto", proto, "address", address)
+	if err != nil {
+		panic(err)
+	}
+	var svln net.Listener
+	if proto == "unix" {
+		unixLn := NewUnixListener(ln)
+		UnixListenerAcceptDeadline(testAcceptDeadline)(unixLn)
+		UnixListenerConnDeadline(connDeadline)(unixLn)
+		svln = unixLn
+	} else {
+		tcpLn := NewTCPListener(ln, ed25519.GenPrivKey())
+		TCPListenerAcceptDeadline(testAcceptDeadline)(tcpLn)
+		TCPListenerConnDeadline(connDeadline)(tcpLn)
+		svln = tcpLn
+	}
+	return NewSocketVal(logger, svln)
+}
+
+func testSetupSocketPair(
+	t *testing.T,
+	chainID string,
+	privValidator types.PrivValidator,
+	addr string,
+	dialer Dialer,
+) (*SocketVal, *RemoteSigner) {
+	var (
+		logger  = log.TestingLogger()
+		privVal = privValidator
+		readyc  = make(chan struct{})
+		rs      = NewRemoteSigner(
+			logger,
+			chainID,
+			privVal,
+			dialer,
+		)
+
+		thisConnTimeout = testConnDeadline
+		sc              = newSocketVal(logger, addr, thisConnTimeout)
+	)
+
+	SocketValHeartbeat(testHeartbeatTimeout)(sc)
+	RemoteSignerConnDeadline(testConnDeadline)(rs)
+	RemoteSignerConnRetries(1e6)(rs)
+
+	testStartSocketPV(t, readyc, sc)
+
+	require.NoError(t, rs.Start())
+	assert.True(t, rs.IsRunning())
+
+	<-readyc
+
+	return sc, rs
+}
+
+func testReadWriteResponse(t *testing.T, resp RemoteSignerMsg, rsConn net.Conn) {
+	_, err := readMsg(rsConn)
+	require.NoError(t, err)
+
+	err = writeMsg(rsConn, resp)
+	require.NoError(t, err)
+}
+
+func testStartSocketPV(t *testing.T, readyc chan struct{}, sc *SocketVal) {
+	go func(sc *SocketVal) {
+		require.NoError(t, sc.Start())
+		assert.True(t, sc.IsRunning())
+
+		readyc <- struct{}{}
+	}(sc)
+}
+
+// testFreeTCPAddr claims a free port so we don't block on listener being ready.
+func testFreeTCPAddr(t *testing.T) string {
+	ln, err := net.Listen("tcp", "127.0.0.1:0")
+	require.NoError(t, err)
+	defer ln.Close()
+
+	return fmt.Sprintf("127.0.0.1:%d", ln.Addr().(*net.TCPAddr).Port)
+}
diff --git a/privval/doc.go b/privval/doc.go
new file mode 100644
index 000000000..ed378c190
--- /dev/null
+++ b/privval/doc.go
@@ -0,0 +1,21 @@
+/*
+
+Package privval provides different implementations of the types.PrivValidator.
+
+FilePV
+
+FilePV is the simplest implementation and developer default. It uses one file for the private key and another to store state.
+
+SocketVal
+
+SocketVal establishes a connection to an external process, like a Key Management Server (KMS), using a socket.
+SocketVal listens for the external KMS process to dial in.
+SocketVal takes a listener, which determines the type of connection
+(ie. encrypted over tcp, or unencrypted over unix).
+
+RemoteSigner
+
+RemoteSigner is a simple wrapper around a net.Conn. It's used by both IPCVal and TCPVal.
+
+*/
+package privval
diff --git a/privval/priv_validator.go b/privval/file.go
similarity index 53%
rename from privval/priv_validator.go
rename to privval/file.go
index ba777e1fd..8072cfa4a 100644
--- a/privval/priv_validator.go
+++ b/privval/file.go
@@ -5,7 +5,6 @@ import (
 	"errors"
 	"fmt"
 	"io/ioutil"
-	"sync"
 	"time"
 
 	"github.com/tendermint/tendermint/crypto"
@@ -23,6 +22,7 @@ const (
 	stepPrecommit int8 = 3
 )
 
+// A vote is either stepPrevote or stepPrecommit.
 func voteToStep(vote *types.Vote) int8 {
 	switch vote.Type {
 	case types.PrevoteType:
@@ -30,131 +30,213 @@ func voteToStep(vote *types.Vote) int8 {
 	case types.PrecommitType:
 		return stepPrecommit
 	default:
-		cmn.PanicSanity("Unknown vote type")
+		panic("Unknown vote type")
 		return 0
 	}
 }
 
-// FilePV implements PrivValidator using data persisted to disk
-// to prevent double signing.
-// NOTE: the directory containing the pv.filePath must already exist.
-// It includes the LastSignature and LastSignBytes so we don't lose the signature
-// if the process crashes after signing but before the resulting consensus message is processed.
-type FilePV struct {
-	Address       types.Address  `json:"address"`
-	PubKey        crypto.PubKey  `json:"pub_key"`
-	LastHeight    int64          `json:"last_height"`
-	LastRound     int            `json:"last_round"`
-	LastStep      int8           `json:"last_step"`
-	LastSignature []byte         `json:"last_signature,omitempty"`
-	LastSignBytes cmn.HexBytes   `json:"last_signbytes,omitempty"`
-	PrivKey       crypto.PrivKey `json:"priv_key"`
-
-	// For persistence.
-	// Overloaded for testing.
+//-------------------------------------------------------------------------------
+
+// FilePVKey stores the immutable part of PrivValidator.
+type FilePVKey struct {
+	Address types.Address  `json:"address"`
+	PubKey  crypto.PubKey  `json:"pub_key"`
+	PrivKey crypto.PrivKey `json:"priv_key"`
+
 	filePath string
-	mtx      sync.Mutex
 }
 
-// GetAddress returns the address of the validator.
-// Implements PrivValidator.
-func (pv *FilePV) GetAddress() types.Address {
-	return pv.Address
+// Save persists the FilePVKey to its filePath.
+func (pvKey FilePVKey) Save() {
+	outFile := pvKey.filePath
+	if outFile == "" {
+		panic("Cannot save PrivValidator key: filePath not set")
+	}
+
+	jsonBytes, err := cdc.MarshalJSONIndent(pvKey, "", "  ")
+	if err != nil {
+		panic(err)
+	}
+	err = cmn.WriteFileAtomic(outFile, jsonBytes, 0600)
+	if err != nil {
+		panic(err)
+	}
+
 }
 
-// GetPubKey returns the public key of the validator.
-// Implements PrivValidator.
-func (pv *FilePV) GetPubKey() crypto.PubKey {
-	return pv.PubKey
+//-------------------------------------------------------------------------------
+
+// FilePVLastSignState stores the mutable part of PrivValidator.
+type FilePVLastSignState struct {
+	Height    int64        `json:"height"`
+	Round     int          `json:"round"`
+	Step      int8         `json:"step"`
+	Signature []byte       `json:"signature,omitempty"`
+	SignBytes cmn.HexBytes `json:"signbytes,omitempty"`
+
+	filePath string
+}
+
+// CheckHRS checks the given height, round, step (HRS) against that of the
+// FilePVLastSignState. It returns an error if the arguments constitute a regression,
+// or if they match but the SignBytes are empty.
+// The returned boolean indicates whether the last Signature should be reused -
+// it returns true if the HRS matches the arguments and the SignBytes are not empty (indicating
+// we have already signed for this HRS, and can reuse the existing signature).
+// It panics if the HRS matches the arguments, there's a SignBytes, but no Signature.
+func (lss *FilePVLastSignState) CheckHRS(height int64, round int, step int8) (bool, error) {
+
+	if lss.Height > height {
+		return false, errors.New("Height regression")
+	}
+
+	if lss.Height == height {
+		if lss.Round > round {
+			return false, errors.New("Round regression")
+		}
+
+		if lss.Round == round {
+			if lss.Step > step {
+				return false, errors.New("Step regression")
+			} else if lss.Step == step {
+				if lss.SignBytes != nil {
+					if lss.Signature == nil {
+						panic("pv: Signature is nil but SignBytes is not!")
+					}
+					return true, nil
+				}
+				return false, errors.New("No SignBytes found")
+			}
+		}
+	}
+	return false, nil
+}
+
+// Save persists the FilePvLastSignState to its filePath.
+func (lss *FilePVLastSignState) Save() {
+	outFile := lss.filePath
+	if outFile == "" {
+		panic("Cannot save FilePVLastSignState: filePath not set")
+	}
+	jsonBytes, err := cdc.MarshalJSONIndent(lss, "", "  ")
+	if err != nil {
+		panic(err)
+	}
+	err = cmn.WriteFileAtomic(outFile, jsonBytes, 0600)
+	if err != nil {
+		panic(err)
+	}
+}
+
+//-------------------------------------------------------------------------------
+
+// FilePV implements PrivValidator using data persisted to disk
+// to prevent double signing.
+// NOTE: the directories containing pv.Key.filePath and pv.LastSignState.filePath must already exist.
+// It includes the LastSignature and LastSignBytes so we don't lose the signature
+// if the process crashes after signing but before the resulting consensus message is processed.
+type FilePV struct {
+	Key           FilePVKey
+	LastSignState FilePVLastSignState
 }
 
 // GenFilePV generates a new validator with randomly generated private key
-// and sets the filePath, but does not call Save().
-func GenFilePV(filePath string) *FilePV {
+// and sets the filePaths, but does not call Save().
+func GenFilePV(keyFilePath, stateFilePath string) *FilePV {
 	privKey := ed25519.GenPrivKey()
+
 	return &FilePV{
-		Address:  privKey.PubKey().Address(),
-		PubKey:   privKey.PubKey(),
-		PrivKey:  privKey,
-		LastStep: stepNone,
-		filePath: filePath,
+		Key: FilePVKey{
+			Address:  privKey.PubKey().Address(),
+			PubKey:   privKey.PubKey(),
+			PrivKey:  privKey,
+			filePath: keyFilePath,
+		},
+		LastSignState: FilePVLastSignState{
+			Step:     stepNone,
+			filePath: stateFilePath,
+		},
 	}
 }
 
-// LoadFilePV loads a FilePV from the filePath.  The FilePV handles double
-// signing prevention by persisting data to the filePath.  If the filePath does
-// not exist, the FilePV must be created manually and saved.
-func LoadFilePV(filePath string) *FilePV {
-	pvJSONBytes, err := ioutil.ReadFile(filePath)
+// LoadFilePV loads a FilePV from the filePaths.  The FilePV handles double
+// signing prevention by persisting data to the stateFilePath.  If either file path
+// does not exist, the program will exit.
+func LoadFilePV(keyFilePath, stateFilePath string) *FilePV {
+	return loadFilePV(keyFilePath, stateFilePath, true)
+}
+
+// LoadFilePVEmptyState loads a FilePV from the given keyFilePath, with an empty LastSignState.
+// If the keyFilePath does not exist, the program will exit.
+func LoadFilePVEmptyState(keyFilePath, stateFilePath string) *FilePV {
+	return loadFilePV(keyFilePath, stateFilePath, false)
+}
+
+// If loadState is true, we load from the stateFilePath. Otherwise, we use an empty LastSignState.
+func loadFilePV(keyFilePath, stateFilePath string, loadState bool) *FilePV {
+	keyJSONBytes, err := ioutil.ReadFile(keyFilePath)
 	if err != nil {
 		cmn.Exit(err.Error())
 	}
-	pv := &FilePV{}
-	err = cdc.UnmarshalJSON(pvJSONBytes, &pv)
+	pvKey := FilePVKey{}
+	err = cdc.UnmarshalJSON(keyJSONBytes, &pvKey)
 	if err != nil {
-		cmn.Exit(fmt.Sprintf("Error reading PrivValidator from %v: %v\n", filePath, err))
+		cmn.Exit(fmt.Sprintf("Error reading PrivValidator key from %v: %v\n", keyFilePath, err))
 	}
 
 	// overwrite pubkey and address for convenience
-	pv.PubKey = pv.PrivKey.PubKey()
-	pv.Address = pv.PubKey.Address()
+	pvKey.PubKey = pvKey.PrivKey.PubKey()
+	pvKey.Address = pvKey.PubKey.Address()
+	pvKey.filePath = keyFilePath
+
+	pvState := FilePVLastSignState{}
+	if loadState {
+		stateJSONBytes, err := ioutil.ReadFile(stateFilePath)
+		if err != nil {
+			cmn.Exit(err.Error())
+		}
+		err = cdc.UnmarshalJSON(stateJSONBytes, &pvState)
+		if err != nil {
+			cmn.Exit(fmt.Sprintf("Error reading PrivValidator state from %v: %v\n", stateFilePath, err))
+		}
+	}
 
-	pv.filePath = filePath
-	return pv
+	pvState.filePath = stateFilePath
+
+	return &FilePV{
+		Key:           pvKey,
+		LastSignState: pvState,
+	}
 }
 
-// LoadOrGenFilePV loads a FilePV from the given filePath
-// or else generates a new one and saves it to the filePath.
-func LoadOrGenFilePV(filePath string) *FilePV {
+// LoadOrGenFilePV loads a FilePV from the given filePaths
+// or else generates a new one and saves it to the filePaths.
+func LoadOrGenFilePV(keyFilePath, stateFilePath string) *FilePV {
 	var pv *FilePV
-	if cmn.FileExists(filePath) {
-		pv = LoadFilePV(filePath)
+	if cmn.FileExists(keyFilePath) {
+		pv = LoadFilePV(keyFilePath, stateFilePath)
 	} else {
-		pv = GenFilePV(filePath)
+		pv = GenFilePV(keyFilePath, stateFilePath)
 		pv.Save()
 	}
 	return pv
 }
 
-// Save persists the FilePV to disk.
-func (pv *FilePV) Save() {
-	pv.mtx.Lock()
-	defer pv.mtx.Unlock()
-	pv.save()
-}
-
-func (pv *FilePV) save() {
-	outFile := pv.filePath
-	if outFile == "" {
-		panic("Cannot save PrivValidator: filePath not set")
-	}
-	jsonBytes, err := cdc.MarshalJSONIndent(pv, "", "  ")
-	if err != nil {
-		panic(err)
-	}
-	err = cmn.WriteFileAtomic(outFile, jsonBytes, 0600)
-	if err != nil {
-		panic(err)
-	}
+// GetAddress returns the address of the validator.
+// Implements PrivValidator.
+func (pv *FilePV) GetAddress() types.Address {
+	return pv.Key.Address
 }
 
-// Reset resets all fields in the FilePV.
-// NOTE: Unsafe!
-func (pv *FilePV) Reset() {
-	var sig []byte
-	pv.LastHeight = 0
-	pv.LastRound = 0
-	pv.LastStep = 0
-	pv.LastSignature = sig
-	pv.LastSignBytes = nil
-	pv.Save()
+// GetPubKey returns the public key of the validator.
+// Implements PrivValidator.
+func (pv *FilePV) GetPubKey() crypto.PubKey {
+	return pv.Key.PubKey
 }
 
 // SignVote signs a canonical representation of the vote, along with the
 // chainID. Implements PrivValidator.
 func (pv *FilePV) SignVote(chainID string, vote *types.Vote) error {
-	pv.mtx.Lock()
-	defer pv.mtx.Unlock()
 	if err := pv.signVote(chainID, vote); err != nil {
 		return fmt.Errorf("Error signing vote: %v", err)
 	}
@@ -164,65 +246,63 @@ func (pv *FilePV) SignVote(chainID string, vote *types.Vote) error {
 // SignProposal signs a canonical representation of the proposal, along with
 // the chainID. Implements PrivValidator.
 func (pv *FilePV) SignProposal(chainID string, proposal *types.Proposal) error {
-	pv.mtx.Lock()
-	defer pv.mtx.Unlock()
 	if err := pv.signProposal(chainID, proposal); err != nil {
 		return fmt.Errorf("Error signing proposal: %v", err)
 	}
 	return nil
 }
 
-// returns error if HRS regression or no LastSignBytes. returns true if HRS is unchanged
-func (pv *FilePV) checkHRS(height int64, round int, step int8) (bool, error) {
-	if pv.LastHeight > height {
-		return false, errors.New("Height regression")
-	}
+// Save persists the FilePV to disk.
+func (pv *FilePV) Save() {
+	pv.Key.Save()
+	pv.LastSignState.Save()
+}
 
-	if pv.LastHeight == height {
-		if pv.LastRound > round {
-			return false, errors.New("Round regression")
-		}
+// Reset resets all fields in the FilePV.
+// NOTE: Unsafe!
+func (pv *FilePV) Reset() {
+	var sig []byte
+	pv.LastSignState.Height = 0
+	pv.LastSignState.Round = 0
+	pv.LastSignState.Step = 0
+	pv.LastSignState.Signature = sig
+	pv.LastSignState.SignBytes = nil
+	pv.Save()
+}
 
-		if pv.LastRound == round {
-			if pv.LastStep > step {
-				return false, errors.New("Step regression")
-			} else if pv.LastStep == step {
-				if pv.LastSignBytes != nil {
-					if pv.LastSignature == nil {
-						panic("pv: LastSignature is nil but LastSignBytes is not!")
-					}
-					return true, nil
-				}
-				return false, errors.New("No LastSignature found")
-			}
-		}
-	}
-	return false, nil
+// String returns a string representation of the FilePV.
+func (pv *FilePV) String() string {
+	return fmt.Sprintf("PrivValidator{%v LH:%v, LR:%v, LS:%v}", pv.GetAddress(), pv.LastSignState.Height, pv.LastSignState.Round, pv.LastSignState.Step)
 }
 
+//------------------------------------------------------------------------------------
+
 // signVote checks if the vote is good to sign and sets the vote signature.
 // It may need to set the timestamp as well if the vote is otherwise the same as
 // a previously signed vote (ie. we crashed after signing but before the vote hit the WAL).
 func (pv *FilePV) signVote(chainID string, vote *types.Vote) error {
 	height, round, step := vote.Height, vote.Round, voteToStep(vote)
-	signBytes := vote.SignBytes(chainID)
 
-	sameHRS, err := pv.checkHRS(height, round, step)
+	lss := pv.LastSignState
+
+	sameHRS, err := lss.CheckHRS(height, round, step)
 	if err != nil {
 		return err
 	}
 
+	signBytes := vote.SignBytes(chainID)
+
 	// We might crash before writing to the wal,
 	// causing us to try to re-sign for the same HRS.
 	// If signbytes are the same, use the last signature.
 	// If they only differ by timestamp, use last timestamp and signature
 	// Otherwise, return error
 	if sameHRS {
-		if bytes.Equal(signBytes, pv.LastSignBytes) {
-			vote.Signature = pv.LastSignature
-		} else if timestamp, ok := checkVotesOnlyDifferByTimestamp(pv.LastSignBytes, signBytes); ok {
+		if bytes.Equal(signBytes, lss.SignBytes) {
+			vote.Signature = lss.Signature
+		} else if timestamp, ok := checkVotesOnlyDifferByTimestamp(lss.SignBytes, signBytes); ok {
 			vote.Timestamp = timestamp
-			vote.Signature = pv.LastSignature
+			vote.Signature = lss.Signature
 		} else {
 			err = fmt.Errorf("Conflicting data")
 		}
@@ -230,7 +310,7 @@ func (pv *FilePV) signVote(chainID string, vote *types.Vote) error {
 	}
 
 	// It passed the checks. Sign the vote
-	sig, err := pv.PrivKey.Sign(signBytes)
+	sig, err := pv.Key.PrivKey.Sign(signBytes)
 	if err != nil {
 		return err
 	}
@@ -244,24 +324,27 @@ func (pv *FilePV) signVote(chainID string, vote *types.Vote) error {
 // a previously signed proposal ie. we crashed after signing but before the proposal hit the WAL).
 func (pv *FilePV) signProposal(chainID string, proposal *types.Proposal) error {
 	height, round, step := proposal.Height, proposal.Round, stepPropose
-	signBytes := proposal.SignBytes(chainID)
 
-	sameHRS, err := pv.checkHRS(height, round, step)
+	lss := pv.LastSignState
+
+	sameHRS, err := lss.CheckHRS(height, round, step)
 	if err != nil {
 		return err
 	}
 
+	signBytes := proposal.SignBytes(chainID)
+
 	// We might crash before writing to the wal,
 	// causing us to try to re-sign for the same HRS.
 	// If signbytes are the same, use the last signature.
 	// If they only differ by timestamp, use last timestamp and signature
 	// Otherwise, return error
 	if sameHRS {
-		if bytes.Equal(signBytes, pv.LastSignBytes) {
-			proposal.Signature = pv.LastSignature
-		} else if timestamp, ok := checkProposalsOnlyDifferByTimestamp(pv.LastSignBytes, signBytes); ok {
+		if bytes.Equal(signBytes, lss.SignBytes) {
+			proposal.Signature = lss.Signature
+		} else if timestamp, ok := checkProposalsOnlyDifferByTimestamp(lss.SignBytes, signBytes); ok {
 			proposal.Timestamp = timestamp
-			proposal.Signature = pv.LastSignature
+			proposal.Signature = lss.Signature
 		} else {
 			err = fmt.Errorf("Conflicting data")
 		}
@@ -269,7 +352,7 @@ func (pv *FilePV) signProposal(chainID string, proposal *types.Proposal) error {
 	}
 
 	// It passed the checks. Sign the proposal
-	sig, err := pv.PrivKey.Sign(signBytes)
+	sig, err := pv.Key.PrivKey.Sign(signBytes)
 	if err != nil {
 		return err
 	}
@@ -282,20 +365,15 @@ func (pv *FilePV) signProposal(chainID string, proposal *types.Proposal) error {
 func (pv *FilePV) saveSigned(height int64, round int, step int8,
 	signBytes []byte, sig []byte) {
 
-	pv.LastHeight = height
-	pv.LastRound = round
-	pv.LastStep = step
-	pv.LastSignature = sig
-	pv.LastSignBytes = signBytes
-	pv.save()
-}
-
-// String returns a string representation of the FilePV.
-func (pv *FilePV) String() string {
-	return fmt.Sprintf("PrivValidator{%v LH:%v, LR:%v, LS:%v}", pv.GetAddress(), pv.LastHeight, pv.LastRound, pv.LastStep)
+	pv.LastSignState.Height = height
+	pv.LastSignState.Round = round
+	pv.LastSignState.Step = step
+	pv.LastSignState.Signature = sig
+	pv.LastSignState.SignBytes = signBytes
+	pv.LastSignState.Save()
 }
 
-//-------------------------------------
+//-----------------------------------------------------------------------------------------
 
 // returns the timestamp from the lastSignBytes.
 // returns true if the only difference in the votes is their timestamp.
diff --git a/privval/priv_validator_test.go b/privval/file_test.go
similarity index 62%
rename from privval/priv_validator_test.go
rename to privval/file_test.go
index 4f4eed97b..06d75a809 100644
--- a/privval/priv_validator_test.go
+++ b/privval/file_test.go
@@ -18,36 +18,100 @@ import (
 func TestGenLoadValidator(t *testing.T) {
 	assert := assert.New(t)
 
-	tempFile, err := ioutil.TempFile("", "priv_validator_")
+	tempKeyFile, err := ioutil.TempFile("", "priv_validator_key_")
 	require.Nil(t, err)
-	privVal := GenFilePV(tempFile.Name())
+	tempStateFile, err := ioutil.TempFile("", "priv_validator_state_")
+	require.Nil(t, err)
+
+	privVal := GenFilePV(tempKeyFile.Name(), tempStateFile.Name())
 
 	height := int64(100)
-	privVal.LastHeight = height
+	privVal.LastSignState.Height = height
 	privVal.Save()
 	addr := privVal.GetAddress()
 
-	privVal = LoadFilePV(tempFile.Name())
+	privVal = LoadFilePV(tempKeyFile.Name(), tempStateFile.Name())
 	assert.Equal(addr, privVal.GetAddress(), "expected privval addr to be the same")
-	assert.Equal(height, privVal.LastHeight, "expected privval.LastHeight to have been saved")
+	assert.Equal(height, privVal.LastSignState.Height, "expected privval.LastHeight to have been saved")
+}
+
+func TestResetValidator(t *testing.T) {
+	tempKeyFile, err := ioutil.TempFile("", "priv_validator_key_")
+	require.Nil(t, err)
+	tempStateFile, err := ioutil.TempFile("", "priv_validator_state_")
+	require.Nil(t, err)
+
+	privVal := GenFilePV(tempKeyFile.Name(), tempStateFile.Name())
+	emptyState := FilePVLastSignState{filePath: tempStateFile.Name()}
+
+	// new priv val has empty state
+	assert.Equal(t, privVal.LastSignState, emptyState)
+
+	// test vote
+	height, round := int64(10), 1
+	voteType := byte(types.PrevoteType)
+	blockID := types.BlockID{[]byte{1, 2, 3}, types.PartSetHeader{}}
+	vote := newVote(privVal.Key.Address, 0, height, round, voteType, blockID)
+	err = privVal.SignVote("mychainid", vote)
+	assert.NoError(t, err, "expected no error signing vote")
+
+	// priv val after signing is not same as empty
+	assert.NotEqual(t, privVal.LastSignState, emptyState)
+
+	// priv val after reset is same as empty
+	privVal.Reset()
+	assert.Equal(t, privVal.LastSignState, emptyState)
 }
 
 func TestLoadOrGenValidator(t *testing.T) {
 	assert := assert.New(t)
 
-	tempFile, err := ioutil.TempFile("", "priv_validator_")
+	tempKeyFile, err := ioutil.TempFile("", "priv_validator_key_")
+	require.Nil(t, err)
+	tempStateFile, err := ioutil.TempFile("", "priv_validator_state_")
 	require.Nil(t, err)
-	tempFilePath := tempFile.Name()
-	if err := os.Remove(tempFilePath); err != nil {
+
+	tempKeyFilePath := tempKeyFile.Name()
+	if err := os.Remove(tempKeyFilePath); err != nil {
+		t.Error(err)
+	}
+	tempStateFilePath := tempStateFile.Name()
+	if err := os.Remove(tempStateFilePath); err != nil {
 		t.Error(err)
 	}
-	privVal := LoadOrGenFilePV(tempFilePath)
+
+	privVal := LoadOrGenFilePV(tempKeyFilePath, tempStateFilePath)
 	addr := privVal.GetAddress()
-	privVal = LoadOrGenFilePV(tempFilePath)
+	privVal = LoadOrGenFilePV(tempKeyFilePath, tempStateFilePath)
 	assert.Equal(addr, privVal.GetAddress(), "expected privval addr to be the same")
 }
 
-func TestUnmarshalValidator(t *testing.T) {
+func TestUnmarshalValidatorState(t *testing.T) {
+	assert, require := assert.New(t), require.New(t)
+
+	// create some fixed values
+	serialized := `{
+		"height": "1",
+		"round": "1",
+		"step": 1
+	}`
+
+	val := FilePVLastSignState{}
+	err := cdc.UnmarshalJSON([]byte(serialized), &val)
+	require.Nil(err, "%+v", err)
+
+	// make sure the values match
+	assert.EqualValues(val.Height, 1)
+	assert.EqualValues(val.Round, 1)
+	assert.EqualValues(val.Step, 1)
+
+	// export it and make sure it is the same
+	out, err := cdc.MarshalJSON(val)
+	require.Nil(err, "%+v", err)
+	assert.JSONEq(serialized, string(out))
+}
+
+func TestUnmarshalValidatorKey(t *testing.T) {
 	assert, require := assert.New(t), require.New(t)
 
 	// create some fixed values
@@ -67,22 +131,19 @@ func TestUnmarshalValidator(t *testing.T) {
     "type": "tendermint/PubKeyEd25519",
     "value": "%s"
   },
-  "last_height": "0",
-  "last_round": "0",
-  "last_step": 0,
   "priv_key": {
     "type": "tendermint/PrivKeyEd25519",
     "value": "%s"
   }
 }`, addr, pubB64, privB64)
 
-	val := FilePV{}
+	val := FilePVKey{}
 	err := cdc.UnmarshalJSON([]byte(serialized), &val)
 	require.Nil(err, "%+v", err)
 
 	// make sure the values match
-	assert.EqualValues(addr, val.GetAddress())
-	assert.EqualValues(pubKey, val.GetPubKey())
+	assert.EqualValues(addr, val.Address)
+	assert.EqualValues(pubKey, val.PubKey)
 	assert.EqualValues(privKey, val.PrivKey)
 
 	// export it and make sure it is the same
@@ -94,9 +155,12 @@ func TestUnmarshalValidator(t *testing.T) {
 func TestSignVote(t *testing.T) {
 	assert := assert.New(t)
 
-	tempFile, err := ioutil.TempFile("", "priv_validator_")
+	tempKeyFile, err := ioutil.TempFile("", "priv_validator_key_")
+	require.Nil(t, err)
+	tempStateFile, err := ioutil.TempFile("", "priv_validator_state_")
 	require.Nil(t, err)
-	privVal := GenFilePV(tempFile.Name())
+
+	privVal := GenFilePV(tempKeyFile.Name(), tempStateFile.Name())
 
 	block1 := types.BlockID{[]byte{1, 2, 3}, types.PartSetHeader{}}
 	block2 := types.BlockID{[]byte{3, 2, 1}, types.PartSetHeader{}}
@@ -104,7 +168,7 @@ func TestSignVote(t *testing.T) {
 	voteType := byte(types.PrevoteType)
 
 	// sign a vote for first time
-	vote := newVote(privVal.Address, 0, height, round, voteType, block1)
+	vote := newVote(privVal.Key.Address, 0, height, round, voteType, block1)
 	err = privVal.SignVote("mychainid", vote)
 	assert.NoError(err, "expected no error signing vote")
 
@@ -114,10 +178,10 @@ func TestSignVote(t *testing.T) {
 
 	// now try some bad votes
 	cases := []*types.Vote{
-		newVote(privVal.Address, 0, height, round-1, voteType, block1),   // round regression
-		newVote(privVal.Address, 0, height-1, round, voteType, block1),   // height regression
-		newVote(privVal.Address, 0, height-2, round+4, voteType, block1), // height regression and different round
-		newVote(privVal.Address, 0, height, round, voteType, block2),     // different block
+		newVote(privVal.Key.Address, 0, height, round-1, voteType, block1),   // round regression
+		newVote(privVal.Key.Address, 0, height-1, round, voteType, block1),   // height regression
+		newVote(privVal.Key.Address, 0, height-2, round+4, voteType, block1), // height regression and different round
+		newVote(privVal.Key.Address, 0, height, round, voteType, block2),     // different block
 	}
 
 	for _, c := range cases {
@@ -136,9 +200,12 @@ func TestSignVote(t *testing.T) {
 func TestSignProposal(t *testing.T) {
 	assert := assert.New(t)
 
-	tempFile, err := ioutil.TempFile("", "priv_validator_")
+	tempKeyFile, err := ioutil.TempFile("", "priv_validator_key_")
+	require.Nil(t, err)
+	tempStateFile, err := ioutil.TempFile("", "priv_validator_state_")
 	require.Nil(t, err)
-	privVal := GenFilePV(tempFile.Name())
+
+	privVal := GenFilePV(tempKeyFile.Name(), tempStateFile.Name())
 
 	block1 := types.BlockID{[]byte{1, 2, 3}, types.PartSetHeader{5, []byte{1, 2, 3}}}
 	block2 := types.BlockID{[]byte{3, 2, 1}, types.PartSetHeader{10, []byte{3, 2, 1}}}
@@ -175,9 +242,12 @@ func TestSignProposal(t *testing.T) {
 }
 
 func TestDifferByTimestamp(t *testing.T) {
-	tempFile, err := ioutil.TempFile("", "priv_validator_")
+	tempKeyFile, err := ioutil.TempFile("", "priv_validator_key_")
 	require.Nil(t, err)
-	privVal := GenFilePV(tempFile.Name())
+	tempStateFile, err := ioutil.TempFile("", "priv_validator_state_")
+	require.Nil(t, err)
+
+	privVal := GenFilePV(tempKeyFile.Name(), tempStateFile.Name())
 
 	block1 := types.BlockID{[]byte{1, 2, 3}, types.PartSetHeader{5, []byte{1, 2, 3}}}
 	height, round := int64(10), 1
@@ -208,7 +278,7 @@ func TestDifferByTimestamp(t *testing.T) {
 	{
 		voteType := byte(types.PrevoteType)
 		blockID := types.BlockID{[]byte{1, 2, 3}, types.PartSetHeader{}}
-		vote := newVote(privVal.Address, 0, height, round, voteType, blockID)
+		vote := newVote(privVal.Key.Address, 0, height, round, voteType, blockID)
 		err := privVal.SignVote("mychainid", vote)
 		assert.NoError(t, err, "expected no error signing vote")
 
diff --git a/privval/ipc.go b/privval/ipc.go
deleted file mode 100644
index eda23fe6f..000000000
--- a/privval/ipc.go
+++ /dev/null
@@ -1,120 +0,0 @@
-package privval
-
-import (
-	"net"
-	"time"
-
-	cmn "github.com/tendermint/tendermint/libs/common"
-	"github.com/tendermint/tendermint/libs/log"
-	"github.com/tendermint/tendermint/types"
-)
-
-// IPCValOption sets an optional parameter on the SocketPV.
-type IPCValOption func(*IPCVal)
-
-// IPCValConnTimeout sets the read and write timeout for connections
-// from external signing processes.
-func IPCValConnTimeout(timeout time.Duration) IPCValOption {
-	return func(sc *IPCVal) { sc.connTimeout = timeout }
-}
-
-// IPCValHeartbeat sets the period on which to check the liveness of the
-// connected Signer connections.
-func IPCValHeartbeat(period time.Duration) IPCValOption {
-	return func(sc *IPCVal) { sc.connHeartbeat = period }
-}
-
-// IPCVal implements PrivValidator, it uses a unix socket to request signatures
-// from an external process.
-type IPCVal struct {
-	cmn.BaseService
-	*RemoteSignerClient
-
-	addr string
-
-	connTimeout   time.Duration
-	connHeartbeat time.Duration
-
-	conn       net.Conn
-	cancelPing chan struct{}
-	pingTicker *time.Ticker
-}
-
-// Check that IPCVal implements PrivValidator.
-var _ types.PrivValidator = (*IPCVal)(nil)
-
-// NewIPCVal returns an instance of IPCVal.
-func NewIPCVal(
-	logger log.Logger,
-	socketAddr string,
-) *IPCVal {
-	sc := &IPCVal{
-		addr:          socketAddr,
-		connTimeout:   connTimeout,
-		connHeartbeat: connHeartbeat,
-	}
-
-	sc.BaseService = *cmn.NewBaseService(logger, "IPCVal", sc)
-
-	return sc
-}
-
-// OnStart implements cmn.Service.
-func (sc *IPCVal) OnStart() error {
-	err := sc.connect()
-	if err != nil {
-		sc.Logger.Error("OnStart", "err", err)
-		return err
-	}
-
-	sc.RemoteSignerClient = NewRemoteSignerClient(sc.conn)
-
-	// Start a routine to keep the connection alive
-	sc.cancelPing = make(chan struct{}, 1)
-	sc.pingTicker = time.NewTicker(sc.connHeartbeat)
-	go func() {
-		for {
-			select {
-			case <-sc.pingTicker.C:
-				err := sc.Ping()
-				if err != nil {
-					sc.Logger.Error("Ping", "err", err)
-				}
-			case <-sc.cancelPing:
-				sc.pingTicker.Stop()
-				return
-			}
-		}
-	}()
-
-	return nil
-}
-
-// OnStop implements cmn.Service.
-func (sc *IPCVal) OnStop() {
-	if sc.cancelPing != nil {
-		close(sc.cancelPing)
-	}
-
-	if sc.conn != nil {
-		if err := sc.conn.Close(); err != nil {
-			sc.Logger.Error("OnStop", "err", err)
-		}
-	}
-}
-
-func (sc *IPCVal) connect() error {
-	la, err := net.ResolveUnixAddr("unix", sc.addr)
-	if err != nil {
-		return err
-	}
-
-	conn, err := net.DialUnix("unix", nil, la)
-	if err != nil {
-		return err
-	}
-
-	sc.conn = newTimeoutConn(conn, sc.connTimeout)
-
-	return nil
-}
diff --git a/privval/ipc_server.go b/privval/ipc_server.go
deleted file mode 100644
index ba9574771..000000000
--- a/privval/ipc_server.go
+++ /dev/null
@@ -1,132 +0,0 @@
-package privval
-
-import (
-	"io"
-	"net"
-	"time"
-
-	cmn "github.com/tendermint/tendermint/libs/common"
-	"github.com/tendermint/tendermint/libs/log"
-	"github.com/tendermint/tendermint/types"
-)
-
-// IPCRemoteSignerOption sets an optional parameter on the IPCRemoteSigner.
-type IPCRemoteSignerOption func(*IPCRemoteSigner)
-
-// IPCRemoteSignerConnDeadline sets the read and write deadline for connections
-// from external signing processes.
-func IPCRemoteSignerConnDeadline(deadline time.Duration) IPCRemoteSignerOption {
-	return func(ss *IPCRemoteSigner) { ss.connDeadline = deadline }
-}
-
-// IPCRemoteSignerConnRetries sets the amount of attempted retries to connect.
-func IPCRemoteSignerConnRetries(retries int) IPCRemoteSignerOption {
-	return func(ss *IPCRemoteSigner) { ss.connRetries = retries }
-}
-
-// IPCRemoteSigner is a RPC implementation of PrivValidator that listens on a unix socket.
-type IPCRemoteSigner struct {
-	cmn.BaseService
-
-	addr         string
-	chainID      string
-	connDeadline time.Duration
-	connRetries  int
-	privVal      types.PrivValidator
-
-	listener *net.UnixListener
-}
-
-// NewIPCRemoteSigner returns an instance of IPCRemoteSigner.
-func NewIPCRemoteSigner(
-	logger log.Logger,
-	chainID, socketAddr string,
-	privVal types.PrivValidator,
-) *IPCRemoteSigner {
-	rs := &IPCRemoteSigner{
-		addr:         socketAddr,
-		chainID:      chainID,
-		connDeadline: time.Second * defaultConnDeadlineSeconds,
-		connRetries:  defaultDialRetries,
-		privVal:      privVal,
-	}
-
-	rs.BaseService = *cmn.NewBaseService(logger, "IPCRemoteSigner", rs)
-
-	return rs
-}
-
-// OnStart implements cmn.Service.
-func (rs *IPCRemoteSigner) OnStart() error {
-	err := rs.listen()
-	if err != nil {
-		err = cmn.ErrorWrap(err, "listen")
-		rs.Logger.Error("OnStart", "err", err)
-		return err
-	}
-
-	go func() {
-		for {
-			conn, err := rs.listener.AcceptUnix()
-			if err != nil {
-				rs.Logger.Error("AcceptUnix", "err", err)
-				return
-			}
-			go rs.handleConnection(conn)
-		}
-	}()
-
-	return nil
-}
-
-// OnStop implements cmn.Service.
-func (rs *IPCRemoteSigner) OnStop() {
-	if rs.listener != nil {
-		if err := rs.listener.Close(); err != nil {
-			rs.Logger.Error("OnStop", "err", cmn.ErrorWrap(err, "closing listener failed"))
-		}
-	}
-}
-
-func (rs *IPCRemoteSigner) listen() error {
-	la, err := net.ResolveUnixAddr("unix", rs.addr)
-	if err != nil {
-		return err
-	}
-
-	rs.listener, err = net.ListenUnix("unix", la)
-
-	return err
-}
-
-func (rs *IPCRemoteSigner) handleConnection(conn net.Conn) {
-	for {
-		if !rs.IsRunning() {
-			return // Ignore error from listener closing.
-		}
-
-		// Reset the connection deadline
-		conn.SetDeadline(time.Now().Add(rs.connDeadline))
-
-		req, err := readMsg(conn)
-		if err != nil {
-			if err != io.EOF {
-				rs.Logger.Error("handleConnection", "err", err)
-			}
-			return
-		}
-
-		res, err := handleRequest(req, rs.chainID, rs.privVal)
-
-		if err != nil {
-			// only log the error; we'll reply with an error in res
-			rs.Logger.Error("handleConnection", "err", err)
-		}
-
-		err = writeMsg(conn, res)
-		if err != nil {
-			rs.Logger.Error("handleConnection", "err", err)
-			return
-		}
-	}
-}
diff --git a/privval/ipc_test.go b/privval/ipc_test.go
deleted file mode 100644
index c8d6dfc77..000000000
--- a/privval/ipc_test.go
+++ /dev/null
@@ -1,147 +0,0 @@
-package privval
-
-import (
-	"io/ioutil"
-	"os"
-	"testing"
-	"time"
-
-	"github.com/stretchr/testify/assert"
-	"github.com/stretchr/testify/require"
-
-	cmn "github.com/tendermint/tendermint/libs/common"
-	"github.com/tendermint/tendermint/libs/log"
-	"github.com/tendermint/tendermint/types"
-)
-
-func TestIPCPVVote(t *testing.T) {
-	var (
-		chainID = cmn.RandStr(12)
-		sc, rs  = testSetupIPCSocketPair(t, chainID, types.NewMockPV())
-
-		ts    = time.Now()
-		vType = types.PrecommitType
-		want  = &types.Vote{Timestamp: ts, Type: vType}
-		have  = &types.Vote{Timestamp: ts, Type: vType}
-	)
-	defer sc.Stop()
-	defer rs.Stop()
-
-	require.NoError(t, rs.privVal.SignVote(chainID, want))
-	require.NoError(t, sc.SignVote(chainID, have))
-	assert.Equal(t, want.Signature, have.Signature)
-}
-
-func TestIPCPVVoteResetDeadline(t *testing.T) {
-	var (
-		chainID = cmn.RandStr(12)
-		sc, rs  = testSetupIPCSocketPair(t, chainID, types.NewMockPV())
-
-		ts    = time.Now()
-		vType = types.PrecommitType
-		want  = &types.Vote{Timestamp: ts, Type: vType}
-		have  = &types.Vote{Timestamp: ts, Type: vType}
-	)
-	defer sc.Stop()
-	defer rs.Stop()
-
-	time.Sleep(3 * time.Millisecond)
-
-	require.NoError(t, rs.privVal.SignVote(chainID, want))
-	require.NoError(t, sc.SignVote(chainID, have))
-	assert.Equal(t, want.Signature, have.Signature)
-
-	// This would exceed the deadline if it was not extended by the previous message
-	time.Sleep(3 * time.Millisecond)
-
-	require.NoError(t, rs.privVal.SignVote(chainID, want))
-	require.NoError(t, sc.SignVote(chainID, have))
-	assert.Equal(t, want.Signature, have.Signature)
-}
-
-func TestIPCPVVoteKeepalive(t *testing.T) {
-	var (
-		chainID = cmn.RandStr(12)
-		sc, rs  = testSetupIPCSocketPair(t, chainID, types.NewMockPV())
-
-		ts    = time.Now()
-		vType = types.PrecommitType
-		want  = &types.Vote{Timestamp: ts, Type: vType}
-		have  = &types.Vote{Timestamp: ts, Type: vType}
-	)
-	defer sc.Stop()
-	defer rs.Stop()
-
-	time.Sleep(10 * time.Millisecond)
-
-	require.NoError(t, rs.privVal.SignVote(chainID, want))
-	require.NoError(t, sc.SignVote(chainID, have))
-	assert.Equal(t, want.Signature, have.Signature)
-}
-
-func testSetupIPCSocketPair(
-	t *testing.T,
-	chainID string,
-	privValidator types.PrivValidator,
-) (*IPCVal, *IPCRemoteSigner) {
-	addr, err := testUnixAddr()
-	require.NoError(t, err)
-
-	var (
-		logger  = log.TestingLogger()
-		privVal = privValidator
-		readyc  = make(chan struct{})
-		rs      = NewIPCRemoteSigner(
-			logger,
-			chainID,
-			addr,
-			privVal,
-		)
-		sc = NewIPCVal(
-			logger,
-			addr,
-		)
-	)
-
-	IPCValConnTimeout(5 * time.Millisecond)(sc)
-	IPCValHeartbeat(time.Millisecond)(sc)
-
-	IPCRemoteSignerConnDeadline(time.Millisecond * 5)(rs)
-
-	testStartIPCRemoteSigner(t, readyc, rs)
-
-	<-readyc
-
-	require.NoError(t, sc.Start())
-	assert.True(t, sc.IsRunning())
-
-	return sc, rs
-}
-
-func testStartIPCRemoteSigner(t *testing.T, readyc chan struct{}, rs *IPCRemoteSigner) {
-	go func(rs *IPCRemoteSigner) {
-		require.NoError(t, rs.Start())
-		assert.True(t, rs.IsRunning())
-
-		readyc <- struct{}{}
-	}(rs)
-}
-
-func testUnixAddr() (string, error) {
-	f, err := ioutil.TempFile("/tmp", "nettest")
-	if err != nil {
-		return "", err
-	}
-
-	addr := f.Name()
-	err = f.Close()
-	if err != nil {
-		return "", err
-	}
-	err = os.Remove(addr)
-	if err != nil {
-		return "", err
-	}
-
-	return addr, nil
-}
diff --git a/privval/old_file.go b/privval/old_file.go
new file mode 100644
index 000000000..ec72c1834
--- /dev/null
+++ b/privval/old_file.go
@@ -0,0 +1,80 @@
+package privval
+
+import (
+	"io/ioutil"
+	"os"
+
+	"github.com/tendermint/tendermint/crypto"
+	cmn "github.com/tendermint/tendermint/libs/common"
+	"github.com/tendermint/tendermint/types"
+)
+
+// OldFilePV is the old version of the FilePV, pre v0.28.0.
+type OldFilePV struct {
+	Address       types.Address  `json:"address"`
+	PubKey        crypto.PubKey  `json:"pub_key"`
+	LastHeight    int64          `json:"last_height"`
+	LastRound     int            `json:"last_round"`
+	LastStep      int8           `json:"last_step"`
+	LastSignature []byte         `json:"last_signature,omitempty"`
+	LastSignBytes cmn.HexBytes   `json:"last_signbytes,omitempty"`
+	PrivKey       crypto.PrivKey `json:"priv_key"`
+
+	filePath string
+}
+
+// LoadOldFilePV loads an OldFilePV from the filePath.
+func LoadOldFilePV(filePath string) (*OldFilePV, error) {
+	pvJSONBytes, err := ioutil.ReadFile(filePath)
+	if err != nil {
+		return nil, err
+	}
+	pv := &OldFilePV{}
+	err = cdc.UnmarshalJSON(pvJSONBytes, &pv)
+	if err != nil {
+		return nil, err
+	}
+
+	// overwrite pubkey and address for convenience
+	pv.PubKey = pv.PrivKey.PubKey()
+	pv.Address = pv.PubKey.Address()
+
+	pv.filePath = filePath
+	return pv, nil
+}
+
+// Upgrade convets the OldFilePV to the new FilePV, separating the immutable and mutable components,
+// and persisting them to the keyFilePath and stateFilePath, respectively.
+// It renames the original file by adding ".bak".
+func (oldFilePV *OldFilePV) Upgrade(keyFilePath, stateFilePath string) *FilePV {
+	privKey := oldFilePV.PrivKey
+	pvKey := FilePVKey{
+		PrivKey:  privKey,
+		PubKey:   privKey.PubKey(),
+		Address:  privKey.PubKey().Address(),
+		filePath: keyFilePath,
+	}
+
+	pvState := FilePVLastSignState{
+		Height:    oldFilePV.LastHeight,
+		Round:     oldFilePV.LastRound,
+		Step:      oldFilePV.LastStep,
+		Signature: oldFilePV.LastSignature,
+		SignBytes: oldFilePV.LastSignBytes,
+		filePath:  stateFilePath,
+	}
+
+	// Save the new PV files
+	pv := &FilePV{
+		Key:           pvKey,
+		LastSignState: pvState,
+	}
+	pv.Save()
+
+	// Rename the old PV file
+	err := os.Rename(oldFilePV.filePath, oldFilePV.filePath+".bak")
+	if err != nil {
+		panic(err)
+	}
+	return pv
+}
diff --git a/privval/old_file_test.go b/privval/old_file_test.go
new file mode 100644
index 000000000..46391a3fe
--- /dev/null
+++ b/privval/old_file_test.go
@@ -0,0 +1,77 @@
+package privval_test
+
+import (
+	"io/ioutil"
+	"os"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+
+	"github.com/tendermint/tendermint/privval"
+)
+
+const oldPrivvalContent = `{
+  "address": "1D8089FAFDFAE4A637F3D616E17B92905FA2D91D",
+  "pub_key": {
+    "type": "tendermint/PubKeyEd25519",
+    "value": "r3Yg2AhDZ745CNTpavsGU+mRZ8WpRXqoJuyqjN8mJq0="
+  },
+  "last_height": "5",
+  "last_round": "0",
+  "last_step": 3,
+  "last_signature": "CTr7b9ZQlrJJf+12rPl5t/YSCUc/KqV7jQogCfFJA24e7hof69X6OMT7eFLVQHyodPjD/QTA298XHV5ejxInDQ==",
+  "last_signbytes": "750802110500000000000000220B08B398F3E00510F48DA6402A480A20FC258973076512999C3E6839A22E9FBDB1B77CF993E8A9955412A41A59D4CAD312240A20C971B286ACB8AAA6FCA0365EB0A660B189EDC08B46B5AF2995DEFA51A28D215B10013211746573742D636861696E2D533245415533",
+  "priv_key": {
+    "type": "tendermint/PrivKeyEd25519",
+    "value": "7MwvTGEWWjsYwjn2IpRb+GYsWi9nnFsw8jPLLY1UtP6vdiDYCENnvjkI1Olq+wZT6ZFnxalFeqgm7KqM3yYmrQ=="
+  }
+}`
+
+func TestLoadAndUpgrade(t *testing.T) {
+
+	oldFilePath := initTmpOldFile(t)
+	defer os.Remove(oldFilePath)
+	newStateFile, err := ioutil.TempFile("", "priv_validator_state*.json")
+	defer os.Remove(newStateFile.Name())
+	require.NoError(t, err)
+	newKeyFile, err := ioutil.TempFile("", "priv_validator_key*.json")
+	defer os.Remove(newKeyFile.Name())
+	require.NoError(t, err)
+
+	oldPV, err := privval.LoadOldFilePV(oldFilePath)
+	assert.NoError(t, err)
+	newPV := oldPV.Upgrade(newKeyFile.Name(), newStateFile.Name())
+
+	assertEqualPV(t, oldPV, newPV)
+	assert.NoError(t, err)
+	upgradedPV := privval.LoadFilePV(newKeyFile.Name(), newStateFile.Name())
+	assertEqualPV(t, oldPV, upgradedPV)
+	oldPV, err = privval.LoadOldFilePV(oldFilePath + ".bak")
+	require.NoError(t, err)
+	assertEqualPV(t, oldPV, upgradedPV)
+}
+
+func assertEqualPV(t *testing.T, oldPV *privval.OldFilePV, newPV *privval.FilePV) {
+	assert.Equal(t, oldPV.Address, newPV.Key.Address)
+	assert.Equal(t, oldPV.Address, newPV.GetAddress())
+	assert.Equal(t, oldPV.PubKey, newPV.Key.PubKey)
+	assert.Equal(t, oldPV.PubKey, newPV.GetPubKey())
+	assert.Equal(t, oldPV.PrivKey, newPV.Key.PrivKey)
+
+	assert.Equal(t, oldPV.LastHeight, newPV.LastSignState.Height)
+	assert.Equal(t, oldPV.LastRound, newPV.LastSignState.Round)
+	assert.Equal(t, oldPV.LastSignature, newPV.LastSignState.Signature)
+	assert.Equal(t, oldPV.LastSignBytes, newPV.LastSignState.SignBytes)
+	assert.Equal(t, oldPV.LastStep, newPV.LastSignState.Step)
+}
+
+func initTmpOldFile(t *testing.T) string {
+	tmpfile, err := ioutil.TempFile("", "priv_validator_*.json")
+	require.NoError(t, err)
+	t.Logf("created test file %s", tmpfile.Name())
+	_, err = tmpfile.WriteString(oldPrivvalContent)
+	require.NoError(t, err)
+
+	return tmpfile.Name()
+}
diff --git a/privval/remote_signer.go b/privval/remote_signer.go
index 5d6339c3e..d928b198e 100644
--- a/privval/remote_signer.go
+++ b/privval/remote_signer.go
@@ -4,7 +4,8 @@ import (
 	"fmt"
 	"io"
 	"net"
-	"sync"
+
+	"github.com/pkg/errors"
 
 	"github.com/tendermint/go-amino"
 	"github.com/tendermint/tendermint/crypto"
@@ -12,68 +13,73 @@ import (
 	"github.com/tendermint/tendermint/types"
 )
 
-// RemoteSignerClient implements PrivValidator, it uses a socket to request signatures
+// Socket errors.
+var (
+	ErrConnTimeout = errors.New("remote signer timed out")
+)
+
+// RemoteSignerClient implements PrivValidator.
+// It uses a net.Conn to request signatures
 // from an external process.
 type RemoteSignerClient struct {
 	conn net.Conn
-	lock sync.Mutex
+
+	// memoized
+	consensusPubKey crypto.PubKey
 }
 
 // Check that RemoteSignerClient implements PrivValidator.
 var _ types.PrivValidator = (*RemoteSignerClient)(nil)
 
 // NewRemoteSignerClient returns an instance of RemoteSignerClient.
-func NewRemoteSignerClient(
-	conn net.Conn,
-) *RemoteSignerClient {
-	sc := &RemoteSignerClient{
-		conn: conn,
-	}
-	return sc
-}
+func NewRemoteSignerClient(conn net.Conn) (*RemoteSignerClient, error) {
 
-// GetAddress implements PrivValidator.
-func (sc *RemoteSignerClient) GetAddress() types.Address {
-	pubKey, err := sc.getPubKey()
+	// retrieve and memoize the consensus public key once.
+	pubKey, err := getPubKey(conn)
 	if err != nil {
-		panic(err)
+		return nil, cmn.ErrorWrap(err, "error while retrieving public key for remote signer")
 	}
+	return &RemoteSignerClient{
+		conn:            conn,
+		consensusPubKey: pubKey,
+	}, nil
+}
 
-	return pubKey.Address()
+// Close calls Close on the underlying net.Conn.
+func (sc *RemoteSignerClient) Close() error {
+	return sc.conn.Close()
 }
 
 // GetPubKey implements PrivValidator.
 func (sc *RemoteSignerClient) GetPubKey() crypto.PubKey {
-	pubKey, err := sc.getPubKey()
-	if err != nil {
-		panic(err)
-	}
-
-	return pubKey
+	return sc.consensusPubKey
 }
 
-func (sc *RemoteSignerClient) getPubKey() (crypto.PubKey, error) {
-	sc.lock.Lock()
-	defer sc.lock.Unlock()
-
-	err := writeMsg(sc.conn, &PubKeyMsg{})
+// not thread-safe (only called on startup).
+func getPubKey(conn net.Conn) (crypto.PubKey, error) {
+	err := writeMsg(conn, &PubKeyRequest{})
 	if err != nil {
 		return nil, err
 	}
 
-	res, err := readMsg(sc.conn)
+	res, err := readMsg(conn)
 	if err != nil {
 		return nil, err
 	}
+	pubKeyResp, ok := res.(*PubKeyResponse)
+	if !ok {
+		return nil, errors.Wrap(ErrUnexpectedResponse, "response is not PubKeyResponse")
+	}
+
+	if pubKeyResp.Error != nil {
+		return nil, errors.Wrap(pubKeyResp.Error, "failed to get private validator's public key")
+	}
 
-	return res.(*PubKeyMsg).PubKey, nil
+	return pubKeyResp.PubKey, nil
 }
 
 // SignVote implements PrivValidator.
 func (sc *RemoteSignerClient) SignVote(chainID string, vote *types.Vote) error {
-	sc.lock.Lock()
-	defer sc.lock.Unlock()
-
 	err := writeMsg(sc.conn, &SignVoteRequest{Vote: vote})
 	if err != nil {
 		return err
@@ -101,9 +107,6 @@ func (sc *RemoteSignerClient) SignProposal(
 	chainID string,
 	proposal *types.Proposal,
 ) error {
-	sc.lock.Lock()
-	defer sc.lock.Unlock()
-
 	err := writeMsg(sc.conn, &SignProposalRequest{Proposal: proposal})
 	if err != nil {
 		return err
@@ -127,9 +130,6 @@ func (sc *RemoteSignerClient) SignProposal(
 
 // Ping is used to check connection health.
 func (sc *RemoteSignerClient) Ping() error {
-	sc.lock.Lock()
-	defer sc.lock.Unlock()
-
 	err := writeMsg(sc.conn, &PingRequest{})
 	if err != nil {
 		return err
@@ -152,7 +152,8 @@ type RemoteSignerMsg interface{}
 
 func RegisterRemoteSignerMsg(cdc *amino.Codec) {
 	cdc.RegisterInterface((*RemoteSignerMsg)(nil), nil)
-	cdc.RegisterConcrete(&PubKeyMsg{}, "tendermint/remotesigner/PubKeyMsg", nil)
+	cdc.RegisterConcrete(&PubKeyRequest{}, "tendermint/remotesigner/PubKeyRequest", nil)
+	cdc.RegisterConcrete(&PubKeyResponse{}, "tendermint/remotesigner/PubKeyResponse", nil)
 	cdc.RegisterConcrete(&SignVoteRequest{}, "tendermint/remotesigner/SignVoteRequest", nil)
 	cdc.RegisterConcrete(&SignedVoteResponse{}, "tendermint/remotesigner/SignedVoteResponse", nil)
 	cdc.RegisterConcrete(&SignProposalRequest{}, "tendermint/remotesigner/SignProposalRequest", nil)
@@ -161,9 +162,13 @@ func RegisterRemoteSignerMsg(cdc *amino.Codec) {
 	cdc.RegisterConcrete(&PingResponse{}, "tendermint/remotesigner/PingResponse", nil)
 }
 
-// PubKeyMsg is a PrivValidatorSocket message containing the public key.
-type PubKeyMsg struct {
+// PubKeyRequest requests the consensus public key from the remote signer.
+type PubKeyRequest struct{}
+
+// PubKeyResponse is a PrivValidatorSocket message containing the public key.
+type PubKeyResponse struct {
 	PubKey crypto.PubKey
+	Error  *RemoteSignerError
 }
 
 // SignVoteRequest is a PrivValidatorSocket message containing a vote.
@@ -227,10 +232,10 @@ func handleRequest(req RemoteSignerMsg, chainID string, privVal types.PrivValida
 	var err error
 
 	switch r := req.(type) {
-	case *PubKeyMsg:
+	case *PubKeyRequest:
 		var p crypto.PubKey
 		p = privVal.GetPubKey()
-		res = &PubKeyMsg{p}
+		res = &PubKeyResponse{p, nil}
 	case *SignVoteRequest:
 		err = privVal.SignVote(chainID, r.Vote)
 		if err != nil {
diff --git a/privval/remote_signer_test.go b/privval/remote_signer_test.go
new file mode 100644
index 000000000..8927e2242
--- /dev/null
+++ b/privval/remote_signer_test.go
@@ -0,0 +1,68 @@
+package privval
+
+import (
+	"net"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+	"github.com/tendermint/tendermint/crypto/ed25519"
+	cmn "github.com/tendermint/tendermint/libs/common"
+	"github.com/tendermint/tendermint/libs/log"
+	"github.com/tendermint/tendermint/types"
+)
+
+// TestRemoteSignerRetryTCPOnly will test connection retry attempts over TCP. We
+// don't need this for Unix sockets because the OS instantly knows the state of
+// both ends of the socket connection. This basically causes the
+// RemoteSigner.dialer() call inside RemoteSigner.connect() to return
+// successfully immediately, putting an instant stop to any retry attempts.
+func TestRemoteSignerRetryTCPOnly(t *testing.T) {
+	var (
+		attemptc = make(chan int)
+		retries  = 2
+	)
+
+	ln, err := net.Listen("tcp", "127.0.0.1:0")
+	require.NoError(t, err)
+
+	go func(ln net.Listener, attemptc chan<- int) {
+		attempts := 0
+
+		for {
+			conn, err := ln.Accept()
+			require.NoError(t, err)
+
+			err = conn.Close()
+			require.NoError(t, err)
+
+			attempts++
+
+			if attempts == retries {
+				attemptc <- attempts
+				break
+			}
+		}
+	}(ln, attemptc)
+
+	rs := NewRemoteSigner(
+		log.TestingLogger(),
+		cmn.RandStr(12),
+		types.NewMockPV(),
+		DialTCPFn(ln.Addr().String(), testConnDeadline, ed25519.GenPrivKey()),
+	)
+	defer rs.Stop()
+
+	RemoteSignerConnDeadline(time.Millisecond)(rs)
+	RemoteSignerConnRetries(retries)(rs)
+
+	assert.Equal(t, rs.Start(), ErrDialRetryMax)
+
+	select {
+	case attempts := <-attemptc:
+		assert.Equal(t, retries, attempts)
+	case <-time.After(100 * time.Millisecond):
+		t.Error("expected remote to observe connection attempts")
+	}
+}
diff --git a/privval/tcp_server.go b/privval/server.go
similarity index 63%
rename from privval/tcp_server.go
rename to privval/server.go
index 694023d76..8b22c69e9 100644
--- a/privval/tcp_server.go
+++ b/privval/server.go
@@ -5,6 +5,7 @@ import (
 	"net"
 	"time"
 
+	"github.com/pkg/errors"
 	"github.com/tendermint/tendermint/crypto/ed25519"
 	cmn "github.com/tendermint/tendermint/libs/common"
 	"github.com/tendermint/tendermint/libs/log"
@@ -12,6 +13,11 @@ import (
 	"github.com/tendermint/tendermint/types"
 )
 
+// Socket errors.
+var (
+	ErrDialRetryMax = errors.New("dialed maximum retries")
+)
+
 // RemoteSignerOption sets an optional parameter on the RemoteSigner.
 type RemoteSignerOption func(*RemoteSigner)
 
@@ -26,38 +32,64 @@ func RemoteSignerConnRetries(retries int) RemoteSignerOption {
 	return func(ss *RemoteSigner) { ss.connRetries = retries }
 }
 
-// RemoteSigner implements PrivValidator by dialing to a socket.
+// RemoteSigner dials using its dialer and responds to any
+// signature requests using its privVal.
 type RemoteSigner struct {
 	cmn.BaseService
 
-	addr         string
 	chainID      string
 	connDeadline time.Duration
 	connRetries  int
-	privKey      ed25519.PrivKeyEd25519
 	privVal      types.PrivValidator
 
-	conn net.Conn
+	dialer Dialer
+	conn   net.Conn
+}
+
+// Dialer dials a remote address and returns a net.Conn or an error.
+type Dialer func() (net.Conn, error)
+
+// DialTCPFn dials the given tcp addr, using the given connTimeout and privKey for the
+// authenticated encryption handshake.
+func DialTCPFn(addr string, connTimeout time.Duration, privKey ed25519.PrivKeyEd25519) Dialer {
+	return func() (net.Conn, error) {
+		conn, err := cmn.Connect(addr)
+		if err == nil {
+			err = conn.SetDeadline(time.Now().Add(connTimeout))
+		}
+		if err == nil {
+			conn, err = p2pconn.MakeSecretConnection(conn, privKey)
+		}
+		return conn, err
+	}
+}
+
+// DialUnixFn dials the given unix socket.
+func DialUnixFn(addr string) Dialer {
+	return func() (net.Conn, error) {
+		unixAddr := &net.UnixAddr{addr, "unix"}
+		return net.DialUnix("unix", nil, unixAddr)
+	}
 }
 
-// NewRemoteSigner returns an instance of RemoteSigner.
+// NewRemoteSigner return a RemoteSigner that will dial using the given
+// dialer and respond to any signature requests over the connection
+// using the given privVal.
 func NewRemoteSigner(
 	logger log.Logger,
-	chainID, socketAddr string,
+	chainID string,
 	privVal types.PrivValidator,
-	privKey ed25519.PrivKeyEd25519,
+	dialer Dialer,
 ) *RemoteSigner {
 	rs := &RemoteSigner{
-		addr:         socketAddr,
 		chainID:      chainID,
 		connDeadline: time.Second * defaultConnDeadlineSeconds,
 		connRetries:  defaultDialRetries,
-		privKey:      privKey,
 		privVal:      privVal,
+		dialer:       dialer,
 	}
 
 	rs.BaseService = *cmn.NewBaseService(logger, "RemoteSigner", rs)
-
 	return rs
 }
 
@@ -68,6 +100,7 @@ func (rs *RemoteSigner) OnStart() error {
 		rs.Logger.Error("OnStart", "err", err)
 		return err
 	}
+	rs.conn = conn
 
 	go rs.handleConnection(conn)
 
@@ -91,36 +124,11 @@ func (rs *RemoteSigner) connect() (net.Conn, error) {
 		if retries != rs.connRetries {
 			time.Sleep(rs.connDeadline)
 		}
-
-		conn, err := cmn.Connect(rs.addr)
+		conn, err := rs.dialer()
 		if err != nil {
-			rs.Logger.Error(
-				"connect",
-				"addr", rs.addr,
-				"err", err,
-			)
-
-			continue
-		}
-
-		if err := conn.SetDeadline(time.Now().Add(connTimeout)); err != nil {
-			rs.Logger.Error(
-				"connect",
-				"err", err,
-			)
+			rs.Logger.Error("dialing", "err", err)
 			continue
 		}
-
-		conn, err = p2pconn.MakeSecretConnection(conn, rs.privKey)
-		if err != nil {
-			rs.Logger.Error(
-				"connect",
-				"err", err,
-			)
-
-			continue
-		}
-
 		return conn, nil
 	}
 
@@ -139,7 +147,7 @@ func (rs *RemoteSigner) handleConnection(conn net.Conn) {
 		req, err := readMsg(conn)
 		if err != nil {
 			if err != io.EOF {
-				rs.Logger.Error("handleConnection", "err", err)
+				rs.Logger.Error("handleConnection readMsg", "err", err)
 			}
 			return
 		}
@@ -148,12 +156,12 @@ func (rs *RemoteSigner) handleConnection(conn net.Conn) {
 
 		if err != nil {
 			// only log the error; we'll reply with an error in res
-			rs.Logger.Error("handleConnection", "err", err)
+			rs.Logger.Error("handleConnection handleRequest", "err", err)
 		}
 
 		err = writeMsg(conn, res)
 		if err != nil {
-			rs.Logger.Error("handleConnection", "err", err)
+			rs.Logger.Error("handleConnection writeMsg", "err", err)
 			return
 		}
 	}
diff --git a/privval/socket.go b/privval/socket.go
new file mode 100644
index 000000000..bd9cd9209
--- /dev/null
+++ b/privval/socket.go
@@ -0,0 +1,184 @@
+package privval
+
+import (
+	"net"
+	"time"
+
+	"github.com/tendermint/tendermint/crypto/ed25519"
+	p2pconn "github.com/tendermint/tendermint/p2p/conn"
+)
+
+const (
+	defaultAcceptDeadlineSeconds = 3
+	defaultConnDeadlineSeconds   = 3
+)
+
+// timeoutError can be used to check if an error returned from the netp package
+// was due to a timeout.
+type timeoutError interface {
+	Timeout() bool
+}
+
+//------------------------------------------------------------------
+// TCP Listener
+
+// TCPListenerOption sets an optional parameter on the tcpListener.
+type TCPListenerOption func(*tcpListener)
+
+// TCPListenerAcceptDeadline sets the deadline for the listener.
+// A zero time value disables the deadline.
+func TCPListenerAcceptDeadline(deadline time.Duration) TCPListenerOption {
+	return func(tl *tcpListener) { tl.acceptDeadline = deadline }
+}
+
+// TCPListenerConnDeadline sets the read and write deadline for connections
+// from external signing processes.
+func TCPListenerConnDeadline(deadline time.Duration) TCPListenerOption {
+	return func(tl *tcpListener) { tl.connDeadline = deadline }
+}
+
+// tcpListener implements net.Listener.
+var _ net.Listener = (*tcpListener)(nil)
+
+// tcpListener wraps a *net.TCPListener to standardise protocol timeouts
+// and potentially other tuning parameters. It also returns encrypted connections.
+type tcpListener struct {
+	*net.TCPListener
+
+	secretConnKey ed25519.PrivKeyEd25519
+
+	acceptDeadline time.Duration
+	connDeadline   time.Duration
+}
+
+// NewTCPListener returns a listener that accepts authenticated encrypted connections
+// using the given secretConnKey and the default timeout values.
+func NewTCPListener(ln net.Listener, secretConnKey ed25519.PrivKeyEd25519) *tcpListener {
+	return &tcpListener{
+		TCPListener:    ln.(*net.TCPListener),
+		secretConnKey:  secretConnKey,
+		acceptDeadline: time.Second * defaultAcceptDeadlineSeconds,
+		connDeadline:   time.Second * defaultConnDeadlineSeconds,
+	}
+}
+
+// Accept implements net.Listener.
+func (ln *tcpListener) Accept() (net.Conn, error) {
+	err := ln.SetDeadline(time.Now().Add(ln.acceptDeadline))
+	if err != nil {
+		return nil, err
+	}
+
+	tc, err := ln.AcceptTCP()
+	if err != nil {
+		return nil, err
+	}
+
+	// Wrap the conn in our timeout and encryption wrappers
+	timeoutConn := newTimeoutConn(tc, ln.connDeadline)
+	secretConn, err := p2pconn.MakeSecretConnection(timeoutConn, ln.secretConnKey)
+	if err != nil {
+		return nil, err
+	}
+
+	return secretConn, nil
+}
+
+//------------------------------------------------------------------
+// Unix Listener
+
+// unixListener implements net.Listener.
+var _ net.Listener = (*unixListener)(nil)
+
+type UnixListenerOption func(*unixListener)
+
+// UnixListenerAcceptDeadline sets the deadline for the listener.
+// A zero time value disables the deadline.
+func UnixListenerAcceptDeadline(deadline time.Duration) UnixListenerOption {
+	return func(ul *unixListener) { ul.acceptDeadline = deadline }
+}
+
+// UnixListenerConnDeadline sets the read and write deadline for connections
+// from external signing processes.
+func UnixListenerConnDeadline(deadline time.Duration) UnixListenerOption {
+	return func(ul *unixListener) { ul.connDeadline = deadline }
+}
+
+// unixListener wraps a *net.UnixListener to standardise protocol timeouts
+// and potentially other tuning parameters. It returns unencrypted connections.
+type unixListener struct {
+	*net.UnixListener
+
+	acceptDeadline time.Duration
+	connDeadline   time.Duration
+}
+
+// NewUnixListener returns a listener that accepts unencrypted connections
+// using the default timeout values.
+func NewUnixListener(ln net.Listener) *unixListener {
+	return &unixListener{
+		UnixListener:   ln.(*net.UnixListener),
+		acceptDeadline: time.Second * defaultAcceptDeadlineSeconds,
+		connDeadline:   time.Second * defaultConnDeadlineSeconds,
+	}
+}
+
+// Accept implements net.Listener.
+func (ln *unixListener) Accept() (net.Conn, error) {
+	err := ln.SetDeadline(time.Now().Add(ln.acceptDeadline))
+	if err != nil {
+		return nil, err
+	}
+
+	tc, err := ln.AcceptUnix()
+	if err != nil {
+		return nil, err
+	}
+
+	// Wrap the conn in our timeout wrapper
+	conn := newTimeoutConn(tc, ln.connDeadline)
+
+	// TODO: wrap in something that authenticates
+	// with a MAC - https://github.com/tendermint/tendermint/issues/3099
+
+	return conn, nil
+}
+
+//------------------------------------------------------------------
+// Connection
+
+// timeoutConn implements net.Conn.
+var _ net.Conn = (*timeoutConn)(nil)
+
+// timeoutConn wraps a net.Conn to standardise protocol timeouts / deadline resets.
+type timeoutConn struct {
+	net.Conn
+
+	connDeadline time.Duration
+}
+
+// newTimeoutConn returns an instance of timeoutConn.
+func newTimeoutConn(
+	conn net.Conn,
+	connDeadline time.Duration) *timeoutConn {
+	return &timeoutConn{
+		conn,
+		connDeadline,
+	}
+}
+
+// Read implements net.Conn.
+func (c timeoutConn) Read(b []byte) (n int, err error) {
+	// Reset deadline
+	c.Conn.SetReadDeadline(time.Now().Add(c.connDeadline))
+
+	return c.Conn.Read(b)
+}
+
+// Write implements net.Conn.
+func (c timeoutConn) Write(b []byte) (n int, err error) {
+	// Reset deadline
+	c.Conn.SetWriteDeadline(time.Now().Add(c.connDeadline))
+
+	return c.Conn.Write(b)
+}
diff --git a/privval/socket_test.go b/privval/socket_test.go
new file mode 100644
index 000000000..b411b7f3a
--- /dev/null
+++ b/privval/socket_test.go
@@ -0,0 +1,133 @@
+package privval
+
+import (
+	"io/ioutil"
+	"net"
+	"os"
+	"testing"
+	"time"
+
+	"github.com/tendermint/tendermint/crypto/ed25519"
+)
+
+//-------------------------------------------
+// helper funcs
+
+func newPrivKey() ed25519.PrivKeyEd25519 {
+	return ed25519.GenPrivKey()
+}
+
+//-------------------------------------------
+// tests
+
+type listenerTestCase struct {
+	description string // For test reporting purposes.
+	listener    net.Listener
+	dialer      Dialer
+}
+
+// testUnixAddr will attempt to obtain a platform-independent temporary file
+// name for a Unix socket
+func testUnixAddr() (string, error) {
+	f, err := ioutil.TempFile("", "tendermint-privval-test-*")
+	if err != nil {
+		return "", err
+	}
+	addr := f.Name()
+	f.Close()
+	os.Remove(addr)
+	return addr, nil
+}
+
+func tcpListenerTestCase(t *testing.T, acceptDeadline, connectDeadline time.Duration) listenerTestCase {
+	ln, err := net.Listen("tcp", "127.0.0.1:0")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	tcpLn := NewTCPListener(ln, newPrivKey())
+	TCPListenerAcceptDeadline(acceptDeadline)(tcpLn)
+	TCPListenerConnDeadline(connectDeadline)(tcpLn)
+	return listenerTestCase{
+		description: "TCP",
+		listener:    tcpLn,
+		dialer:      DialTCPFn(ln.Addr().String(), testConnDeadline, newPrivKey()),
+	}
+}
+
+func unixListenerTestCase(t *testing.T, acceptDeadline, connectDeadline time.Duration) listenerTestCase {
+	addr, err := testUnixAddr()
+	if err != nil {
+		t.Fatal(err)
+	}
+	ln, err := net.Listen("unix", addr)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	unixLn := NewUnixListener(ln)
+	UnixListenerAcceptDeadline(acceptDeadline)(unixLn)
+	UnixListenerConnDeadline(connectDeadline)(unixLn)
+	return listenerTestCase{
+		description: "Unix",
+		listener:    unixLn,
+		dialer:      DialUnixFn(addr),
+	}
+}
+
+func listenerTestCases(t *testing.T, acceptDeadline, connectDeadline time.Duration) []listenerTestCase {
+	return []listenerTestCase{
+		tcpListenerTestCase(t, acceptDeadline, connectDeadline),
+		unixListenerTestCase(t, acceptDeadline, connectDeadline),
+	}
+}
+
+func TestListenerAcceptDeadlines(t *testing.T) {
+	for _, tc := range listenerTestCases(t, time.Millisecond, time.Second) {
+		_, err := tc.listener.Accept()
+		opErr, ok := err.(*net.OpError)
+		if !ok {
+			t.Fatalf("for %s listener, have %v, want *net.OpError", tc.description, err)
+		}
+
+		if have, want := opErr.Op, "accept"; have != want {
+			t.Errorf("for %s listener,  have %v, want %v", tc.description, have, want)
+		}
+	}
+}
+
+func TestListenerConnectDeadlines(t *testing.T) {
+	for _, tc := range listenerTestCases(t, time.Second, time.Millisecond) {
+		readyc := make(chan struct{})
+		donec := make(chan struct{})
+		go func(ln net.Listener) {
+			defer close(donec)
+
+			c, err := ln.Accept()
+			if err != nil {
+				t.Fatal(err)
+			}
+			<-readyc
+
+			time.Sleep(2 * time.Millisecond)
+
+			msg := make([]byte, 200)
+			_, err = c.Read(msg)
+			opErr, ok := err.(*net.OpError)
+			if !ok {
+				t.Fatalf("for %s listener, have %v, want *net.OpError", tc.description, err)
+			}
+
+			if have, want := opErr.Op, "read"; have != want {
+				t.Errorf("for %s listener, have %v, want %v", tc.description, have, want)
+			}
+		}(tc.listener)
+
+		_, err := tc.dialer()
+		if err != nil {
+			t.Fatal(err)
+		}
+		close(readyc)
+		<-donec
+	}
+}
diff --git a/privval/tcp.go b/privval/tcp.go
deleted file mode 100644
index 11bd833c0..000000000
--- a/privval/tcp.go
+++ /dev/null
@@ -1,214 +0,0 @@
-package privval
-
-import (
-	"errors"
-	"net"
-	"time"
-
-	"github.com/tendermint/tendermint/crypto/ed25519"
-	cmn "github.com/tendermint/tendermint/libs/common"
-	"github.com/tendermint/tendermint/libs/log"
-	p2pconn "github.com/tendermint/tendermint/p2p/conn"
-	"github.com/tendermint/tendermint/types"
-)
-
-const (
-	defaultAcceptDeadlineSeconds = 3
-	defaultConnDeadlineSeconds   = 3
-	defaultConnHeartBeatSeconds  = 2
-	defaultDialRetries           = 10
-)
-
-// Socket errors.
-var (
-	ErrDialRetryMax       = errors.New("dialed maximum retries")
-	ErrConnTimeout        = errors.New("remote signer timed out")
-	ErrUnexpectedResponse = errors.New("received unexpected response")
-)
-
-var (
-	acceptDeadline = time.Second * defaultAcceptDeadlineSeconds
-	connTimeout    = time.Second * defaultConnDeadlineSeconds
-	connHeartbeat  = time.Second * defaultConnHeartBeatSeconds
-)
-
-// TCPValOption sets an optional parameter on the SocketPV.
-type TCPValOption func(*TCPVal)
-
-// TCPValAcceptDeadline sets the deadline for the TCPVal listener.
-// A zero time value disables the deadline.
-func TCPValAcceptDeadline(deadline time.Duration) TCPValOption {
-	return func(sc *TCPVal) { sc.acceptDeadline = deadline }
-}
-
-// TCPValConnTimeout sets the read and write timeout for connections
-// from external signing processes.
-func TCPValConnTimeout(timeout time.Duration) TCPValOption {
-	return func(sc *TCPVal) { sc.connTimeout = timeout }
-}
-
-// TCPValHeartbeat sets the period on which to check the liveness of the
-// connected Signer connections.
-func TCPValHeartbeat(period time.Duration) TCPValOption {
-	return func(sc *TCPVal) { sc.connHeartbeat = period }
-}
-
-// TCPVal implements PrivValidator, it uses a socket to request signatures
-// from an external process.
-type TCPVal struct {
-	cmn.BaseService
-	*RemoteSignerClient
-
-	addr           string
-	acceptDeadline time.Duration
-	connTimeout    time.Duration
-	connHeartbeat  time.Duration
-	privKey        ed25519.PrivKeyEd25519
-
-	conn       net.Conn
-	listener   net.Listener
-	cancelPing chan struct{}
-	pingTicker *time.Ticker
-}
-
-// Check that TCPVal implements PrivValidator.
-var _ types.PrivValidator = (*TCPVal)(nil)
-
-// NewTCPVal returns an instance of TCPVal.
-func NewTCPVal(
-	logger log.Logger,
-	socketAddr string,
-	privKey ed25519.PrivKeyEd25519,
-) *TCPVal {
-	sc := &TCPVal{
-		addr:           socketAddr,
-		acceptDeadline: acceptDeadline,
-		connTimeout:    connTimeout,
-		connHeartbeat:  connHeartbeat,
-		privKey:        privKey,
-	}
-
-	sc.BaseService = *cmn.NewBaseService(logger, "TCPVal", sc)
-
-	return sc
-}
-
-// OnStart implements cmn.Service.
-func (sc *TCPVal) OnStart() error {
-	if err := sc.listen(); err != nil {
-		sc.Logger.Error("OnStart", "err", err)
-		return err
-	}
-
-	conn, err := sc.waitConnection()
-	if err != nil {
-		sc.Logger.Error("OnStart", "err", err)
-		return err
-	}
-
-	sc.conn = conn
-
-	sc.RemoteSignerClient = NewRemoteSignerClient(sc.conn)
-
-	// Start a routine to keep the connection alive
-	sc.cancelPing = make(chan struct{}, 1)
-	sc.pingTicker = time.NewTicker(sc.connHeartbeat)
-	go func() {
-		for {
-			select {
-			case <-sc.pingTicker.C:
-				err := sc.Ping()
-				if err != nil {
-					sc.Logger.Error(
-						"Ping",
-						"err", err,
-					)
-				}
-			case <-sc.cancelPing:
-				sc.pingTicker.Stop()
-				return
-			}
-		}
-	}()
-
-	return nil
-}
-
-// OnStop implements cmn.Service.
-func (sc *TCPVal) OnStop() {
-	if sc.cancelPing != nil {
-		close(sc.cancelPing)
-	}
-
-	if sc.conn != nil {
-		if err := sc.conn.Close(); err != nil {
-			sc.Logger.Error("OnStop", "err", err)
-		}
-	}
-
-	if sc.listener != nil {
-		if err := sc.listener.Close(); err != nil {
-			sc.Logger.Error("OnStop", "err", err)
-		}
-	}
-}
-
-func (sc *TCPVal) acceptConnection() (net.Conn, error) {
-	conn, err := sc.listener.Accept()
-	if err != nil {
-		if !sc.IsRunning() {
-			return nil, nil // Ignore error from listener closing.
-		}
-		return nil, err
-
-	}
-
-	conn, err = p2pconn.MakeSecretConnection(conn, sc.privKey)
-	if err != nil {
-		return nil, err
-	}
-
-	return conn, nil
-}
-
-func (sc *TCPVal) listen() error {
-	ln, err := net.Listen(cmn.ProtocolAndAddress(sc.addr))
-	if err != nil {
-		return err
-	}
-
-	sc.listener = newTCPTimeoutListener(
-		ln,
-		sc.acceptDeadline,
-		sc.connTimeout,
-		sc.connHeartbeat,
-	)
-
-	return nil
-}
-
-// waitConnection uses the configured wait timeout to error if no external
-// process connects in the time period.
-func (sc *TCPVal) waitConnection() (net.Conn, error) {
-	var (
-		connc = make(chan net.Conn, 1)
-		errc  = make(chan error, 1)
-	)
-
-	go func(connc chan<- net.Conn, errc chan<- error) {
-		conn, err := sc.acceptConnection()
-		if err != nil {
-			errc <- err
-			return
-		}
-
-		connc <- conn
-	}(connc, errc)
-
-	select {
-	case conn := <-connc:
-		return conn, nil
-	case err := <-errc:
-		return nil, err
-	}
-}
diff --git a/privval/tcp_socket.go b/privval/tcp_socket.go
deleted file mode 100644
index 2b17bf26e..000000000
--- a/privval/tcp_socket.go
+++ /dev/null
@@ -1,90 +0,0 @@
-package privval
-
-import (
-	"net"
-	"time"
-)
-
-// timeoutError can be used to check if an error returned from the netp package
-// was due to a timeout.
-type timeoutError interface {
-	Timeout() bool
-}
-
-// tcpTimeoutListener implements net.Listener.
-var _ net.Listener = (*tcpTimeoutListener)(nil)
-
-// tcpTimeoutListener wraps a *net.TCPListener to standardise protocol timeouts
-// and potentially other tuning parameters.
-type tcpTimeoutListener struct {
-	*net.TCPListener
-
-	acceptDeadline time.Duration
-	connDeadline   time.Duration
-	period         time.Duration
-}
-
-// timeoutConn wraps a net.Conn to standardise protocol timeouts / deadline resets.
-type timeoutConn struct {
-	net.Conn
-
-	connDeadline time.Duration
-}
-
-// newTCPTimeoutListener returns an instance of tcpTimeoutListener.
-func newTCPTimeoutListener(
-	ln net.Listener,
-	acceptDeadline, connDeadline time.Duration,
-	period time.Duration,
-) tcpTimeoutListener {
-	return tcpTimeoutListener{
-		TCPListener:    ln.(*net.TCPListener),
-		acceptDeadline: acceptDeadline,
-		connDeadline:   connDeadline,
-		period:         period,
-	}
-}
-
-// newTimeoutConn returns an instance of newTCPTimeoutConn.
-func newTimeoutConn(
-	conn net.Conn,
-	connDeadline time.Duration) *timeoutConn {
-	return &timeoutConn{
-		conn,
-		connDeadline,
-	}
-}
-
-// Accept implements net.Listener.
-func (ln tcpTimeoutListener) Accept() (net.Conn, error) {
-	err := ln.SetDeadline(time.Now().Add(ln.acceptDeadline))
-	if err != nil {
-		return nil, err
-	}
-
-	tc, err := ln.AcceptTCP()
-	if err != nil {
-		return nil, err
-	}
-
-	// Wrap the conn in our timeout wrapper
-	conn := newTimeoutConn(tc, ln.connDeadline)
-
-	return conn, nil
-}
-
-// Read implements net.Listener.
-func (c timeoutConn) Read(b []byte) (n int, err error) {
-	// Reset deadline
-	c.Conn.SetReadDeadline(time.Now().Add(c.connDeadline))
-
-	return c.Conn.Read(b)
-}
-
-// Write implements net.Listener.
-func (c timeoutConn) Write(b []byte) (n int, err error) {
-	// Reset deadline
-	c.Conn.SetWriteDeadline(time.Now().Add(c.connDeadline))
-
-	return c.Conn.Write(b)
-}
diff --git a/privval/tcp_socket_test.go b/privval/tcp_socket_test.go
deleted file mode 100644
index 285e73ed5..000000000
--- a/privval/tcp_socket_test.go
+++ /dev/null
@@ -1,65 +0,0 @@
-package privval
-
-import (
-	"net"
-	"testing"
-	"time"
-)
-
-func TestTCPTimeoutListenerAcceptDeadline(t *testing.T) {
-	ln, err := net.Listen("tcp", "127.0.0.1:0")
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	ln = newTCPTimeoutListener(ln, time.Millisecond, time.Second, time.Second)
-
-	_, err = ln.Accept()
-	opErr, ok := err.(*net.OpError)
-	if !ok {
-		t.Fatalf("have %v, want *net.OpError", err)
-	}
-
-	if have, want := opErr.Op, "accept"; have != want {
-		t.Errorf("have %v, want %v", have, want)
-	}
-}
-
-func TestTCPTimeoutListenerConnDeadline(t *testing.T) {
-	ln, err := net.Listen("tcp", "127.0.0.1:0")
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	ln = newTCPTimeoutListener(ln, time.Second, time.Millisecond, time.Second)
-
-	donec := make(chan struct{})
-	go func(ln net.Listener) {
-		defer close(donec)
-
-		c, err := ln.Accept()
-		if err != nil {
-			t.Fatal(err)
-		}
-
-		time.Sleep(2 * time.Millisecond)
-
-		msg := make([]byte, 200)
-		_, err = c.Read(msg)
-		opErr, ok := err.(*net.OpError)
-		if !ok {
-			t.Fatalf("have %v, want *net.OpError", err)
-		}
-
-		if have, want := opErr.Op, "read"; have != want {
-			t.Errorf("have %v, want %v", have, want)
-		}
-	}(ln)
-
-	_, err = net.Dial("tcp", ln.Addr().String())
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	<-donec
-}
diff --git a/privval/tcp_test.go b/privval/tcp_test.go
deleted file mode 100644
index d2489ad16..000000000
--- a/privval/tcp_test.go
+++ /dev/null
@@ -1,407 +0,0 @@
-package privval
-
-import (
-	"fmt"
-	"net"
-	"testing"
-	"time"
-
-	"github.com/stretchr/testify/assert"
-	"github.com/stretchr/testify/require"
-
-	"github.com/tendermint/tendermint/crypto/ed25519"
-	cmn "github.com/tendermint/tendermint/libs/common"
-	"github.com/tendermint/tendermint/libs/log"
-
-	p2pconn "github.com/tendermint/tendermint/p2p/conn"
-	"github.com/tendermint/tendermint/types"
-)
-
-func TestSocketPVAddress(t *testing.T) {
-	var (
-		chainID = cmn.RandStr(12)
-		sc, rs  = testSetupSocketPair(t, chainID, types.NewMockPV())
-	)
-	defer sc.Stop()
-	defer rs.Stop()
-
-	serverAddr := rs.privVal.GetAddress()
-
-	clientAddr := sc.GetAddress()
-
-	assert.Equal(t, serverAddr, clientAddr)
-
-	// TODO(xla): Remove when PrivValidator2 replaced PrivValidator.
-	assert.Equal(t, serverAddr, sc.GetAddress())
-
-}
-
-func TestSocketPVPubKey(t *testing.T) {
-	var (
-		chainID = cmn.RandStr(12)
-		sc, rs  = testSetupSocketPair(t, chainID, types.NewMockPV())
-	)
-	defer sc.Stop()
-	defer rs.Stop()
-
-	clientKey, err := sc.getPubKey()
-	require.NoError(t, err)
-
-	privKey := rs.privVal.GetPubKey()
-
-	assert.Equal(t, privKey, clientKey)
-
-	// TODO(xla): Remove when PrivValidator2 replaced PrivValidator.
-	assert.Equal(t, privKey, sc.GetPubKey())
-}
-
-func TestSocketPVProposal(t *testing.T) {
-	var (
-		chainID = cmn.RandStr(12)
-		sc, rs  = testSetupSocketPair(t, chainID, types.NewMockPV())
-
-		ts             = time.Now()
-		privProposal   = &types.Proposal{Timestamp: ts}
-		clientProposal = &types.Proposal{Timestamp: ts}
-	)
-	defer sc.Stop()
-	defer rs.Stop()
-
-	require.NoError(t, rs.privVal.SignProposal(chainID, privProposal))
-	require.NoError(t, sc.SignProposal(chainID, clientProposal))
-	assert.Equal(t, privProposal.Signature, clientProposal.Signature)
-}
-
-func TestSocketPVVote(t *testing.T) {
-	var (
-		chainID = cmn.RandStr(12)
-		sc, rs  = testSetupSocketPair(t, chainID, types.NewMockPV())
-
-		ts    = time.Now()
-		vType = types.PrecommitType
-		want  = &types.Vote{Timestamp: ts, Type: vType}
-		have  = &types.Vote{Timestamp: ts, Type: vType}
-	)
-	defer sc.Stop()
-	defer rs.Stop()
-
-	require.NoError(t, rs.privVal.SignVote(chainID, want))
-	require.NoError(t, sc.SignVote(chainID, have))
-	assert.Equal(t, want.Signature, have.Signature)
-}
-
-func TestSocketPVVoteResetDeadline(t *testing.T) {
-	var (
-		chainID = cmn.RandStr(12)
-		sc, rs  = testSetupSocketPair(t, chainID, types.NewMockPV())
-
-		ts    = time.Now()
-		vType = types.PrecommitType
-		want  = &types.Vote{Timestamp: ts, Type: vType}
-		have  = &types.Vote{Timestamp: ts, Type: vType}
-	)
-	defer sc.Stop()
-	defer rs.Stop()
-
-	time.Sleep(3 * time.Millisecond)
-
-	require.NoError(t, rs.privVal.SignVote(chainID, want))
-	require.NoError(t, sc.SignVote(chainID, have))
-	assert.Equal(t, want.Signature, have.Signature)
-
-	// This would exceed the deadline if it was not extended by the previous message
-	time.Sleep(3 * time.Millisecond)
-
-	require.NoError(t, rs.privVal.SignVote(chainID, want))
-	require.NoError(t, sc.SignVote(chainID, have))
-	assert.Equal(t, want.Signature, have.Signature)
-}
-
-func TestSocketPVVoteKeepalive(t *testing.T) {
-	var (
-		chainID = cmn.RandStr(12)
-		sc, rs  = testSetupSocketPair(t, chainID, types.NewMockPV())
-
-		ts    = time.Now()
-		vType = types.PrecommitType
-		want  = &types.Vote{Timestamp: ts, Type: vType}
-		have  = &types.Vote{Timestamp: ts, Type: vType}
-	)
-	defer sc.Stop()
-	defer rs.Stop()
-
-	time.Sleep(10 * time.Millisecond)
-
-	require.NoError(t, rs.privVal.SignVote(chainID, want))
-	require.NoError(t, sc.SignVote(chainID, have))
-	assert.Equal(t, want.Signature, have.Signature)
-}
-
-func TestSocketPVDeadline(t *testing.T) {
-	var (
-		addr    = testFreeAddr(t)
-		listenc = make(chan struct{})
-		sc      = NewTCPVal(
-			log.TestingLogger(),
-			addr,
-			ed25519.GenPrivKey(),
-		)
-	)
-
-	TCPValConnTimeout(100 * time.Millisecond)(sc)
-
-	go func(sc *TCPVal) {
-		defer close(listenc)
-
-		require.NoError(t, sc.Start())
-
-		assert.True(t, sc.IsRunning())
-	}(sc)
-
-	for {
-		conn, err := cmn.Connect(addr)
-		if err != nil {
-			continue
-		}
-
-		_, err = p2pconn.MakeSecretConnection(
-			conn,
-			ed25519.GenPrivKey(),
-		)
-		if err == nil {
-			break
-		}
-	}
-
-	<-listenc
-
-	_, err := sc.getPubKey()
-	assert.Equal(t, err.(cmn.Error).Data(), ErrConnTimeout)
-}
-
-func TestRemoteSignerRetry(t *testing.T) {
-	var (
-		attemptc = make(chan int)
-		retries  = 2
-	)
-
-	ln, err := net.Listen("tcp", "127.0.0.1:0")
-	require.NoError(t, err)
-
-	go func(ln net.Listener, attemptc chan<- int) {
-		attempts := 0
-
-		for {
-			conn, err := ln.Accept()
-			require.NoError(t, err)
-
-			err = conn.Close()
-			require.NoError(t, err)
-
-			attempts++
-
-			if attempts == retries {
-				attemptc <- attempts
-				break
-			}
-		}
-	}(ln, attemptc)
-
-	rs := NewRemoteSigner(
-		log.TestingLogger(),
-		cmn.RandStr(12),
-		ln.Addr().String(),
-		types.NewMockPV(),
-		ed25519.GenPrivKey(),
-	)
-	defer rs.Stop()
-
-	RemoteSignerConnDeadline(time.Millisecond)(rs)
-	RemoteSignerConnRetries(retries)(rs)
-
-	assert.Equal(t, rs.Start(), ErrDialRetryMax)
-
-	select {
-	case attempts := <-attemptc:
-		assert.Equal(t, retries, attempts)
-	case <-time.After(100 * time.Millisecond):
-		t.Error("expected remote to observe connection attempts")
-	}
-}
-
-func TestRemoteSignVoteErrors(t *testing.T) {
-	var (
-		chainID = cmn.RandStr(12)
-		sc, rs  = testSetupSocketPair(t, chainID, types.NewErroringMockPV())
-
-		ts    = time.Now()
-		vType = types.PrecommitType
-		vote  = &types.Vote{Timestamp: ts, Type: vType}
-	)
-	defer sc.Stop()
-	defer rs.Stop()
-
-	err := writeMsg(sc.conn, &SignVoteRequest{Vote: vote})
-	require.NoError(t, err)
-
-	res, err := readMsg(sc.conn)
-	require.NoError(t, err)
-
-	resp := *res.(*SignedVoteResponse)
-	require.NotNil(t, resp.Error)
-	require.Equal(t, resp.Error.Description, types.ErroringMockPVErr.Error())
-
-	err = rs.privVal.SignVote(chainID, vote)
-	require.Error(t, err)
-	err = sc.SignVote(chainID, vote)
-	require.Error(t, err)
-}
-
-func TestRemoteSignProposalErrors(t *testing.T) {
-	var (
-		chainID = cmn.RandStr(12)
-		sc, rs  = testSetupSocketPair(t, chainID, types.NewErroringMockPV())
-
-		ts       = time.Now()
-		proposal = &types.Proposal{Timestamp: ts}
-	)
-	defer sc.Stop()
-	defer rs.Stop()
-
-	err := writeMsg(sc.conn, &SignProposalRequest{Proposal: proposal})
-	require.NoError(t, err)
-
-	res, err := readMsg(sc.conn)
-	require.NoError(t, err)
-
-	resp := *res.(*SignedProposalResponse)
-	require.NotNil(t, resp.Error)
-	require.Equal(t, resp.Error.Description, types.ErroringMockPVErr.Error())
-
-	err = rs.privVal.SignProposal(chainID, proposal)
-	require.Error(t, err)
-
-	err = sc.SignProposal(chainID, proposal)
-	require.Error(t, err)
-}
-
-func TestErrUnexpectedResponse(t *testing.T) {
-	var (
-		addr    = testFreeAddr(t)
-		logger  = log.TestingLogger()
-		chainID = cmn.RandStr(12)
-		readyc  = make(chan struct{})
-		errc    = make(chan error, 1)
-
-		rs = NewRemoteSigner(
-			logger,
-			chainID,
-			addr,
-			types.NewMockPV(),
-			ed25519.GenPrivKey(),
-		)
-		sc = NewTCPVal(
-			logger,
-			addr,
-			ed25519.GenPrivKey(),
-		)
-	)
-
-	testStartSocketPV(t, readyc, sc)
-	defer sc.Stop()
-	RemoteSignerConnDeadline(time.Millisecond)(rs)
-	RemoteSignerConnRetries(1e6)(rs)
-
-	// we do not want to Start() the remote signer here and instead use the connection to
-	// reply with intentionally wrong replies below:
-	rsConn, err := rs.connect()
-	defer rsConn.Close()
-	require.NoError(t, err)
-	require.NotNil(t, rsConn)
-	<-readyc
-
-	// Proposal:
-	go func(errc chan error) {
-		errc <- sc.SignProposal(chainID, &types.Proposal{})
-	}(errc)
-	// read request and write wrong response:
-	go testReadWriteResponse(t, &SignedVoteResponse{}, rsConn)
-	err = <-errc
-	require.Error(t, err)
-	require.Equal(t, err, ErrUnexpectedResponse)
-
-	// Vote:
-	go func(errc chan error) {
-		errc <- sc.SignVote(chainID, &types.Vote{})
-	}(errc)
-	// read request and write wrong response:
-	go testReadWriteResponse(t, &SignedProposalResponse{}, rsConn)
-	err = <-errc
-	require.Error(t, err)
-	require.Equal(t, err, ErrUnexpectedResponse)
-}
-
-func testSetupSocketPair(
-	t *testing.T,
-	chainID string,
-	privValidator types.PrivValidator,
-) (*TCPVal, *RemoteSigner) {
-	var (
-		addr    = testFreeAddr(t)
-		logger  = log.TestingLogger()
-		privVal = privValidator
-		readyc  = make(chan struct{})
-		rs      = NewRemoteSigner(
-			logger,
-			chainID,
-			addr,
-			privVal,
-			ed25519.GenPrivKey(),
-		)
-		sc = NewTCPVal(
-			logger,
-			addr,
-			ed25519.GenPrivKey(),
-		)
-	)
-
-	TCPValConnTimeout(5 * time.Millisecond)(sc)
-	TCPValHeartbeat(2 * time.Millisecond)(sc)
-	RemoteSignerConnDeadline(5 * time.Millisecond)(rs)
-	RemoteSignerConnRetries(1e6)(rs)
-
-	testStartSocketPV(t, readyc, sc)
-
-	require.NoError(t, rs.Start())
-	assert.True(t, rs.IsRunning())
-
-	<-readyc
-
-	return sc, rs
-}
-
-func testReadWriteResponse(t *testing.T, resp RemoteSignerMsg, rsConn net.Conn) {
-	_, err := readMsg(rsConn)
-	require.NoError(t, err)
-
-	err = writeMsg(rsConn, resp)
-	require.NoError(t, err)
-}
-
-func testStartSocketPV(t *testing.T, readyc chan struct{}, sc *TCPVal) {
-	go func(sc *TCPVal) {
-		require.NoError(t, sc.Start())
-		assert.True(t, sc.IsRunning())
-
-		readyc <- struct{}{}
-	}(sc)
-}
-
-// testFreeAddr claims a free port so we don't block on listener being ready.
-func testFreeAddr(t *testing.T) string {
-	ln, err := net.Listen("tcp", "127.0.0.1:0")
-	require.NoError(t, err)
-	defer ln.Close()
-
-	return fmt.Sprintf("127.0.0.1:%d", ln.Addr().(*net.TCPAddr).Port)
-}
diff --git a/proxy/client.go b/proxy/client.go
index 87f4e716d..c5ee5fe1d 100644
--- a/proxy/client.go
+++ b/proxy/client.go
@@ -6,6 +6,7 @@ import (
 	"github.com/pkg/errors"
 
 	abcicli "github.com/tendermint/tendermint/abci/client"
+	"github.com/tendermint/tendermint/abci/example/counter"
 	"github.com/tendermint/tendermint/abci/example/kvstore"
 	"github.com/tendermint/tendermint/abci/types"
 )
@@ -64,15 +65,15 @@ func (r *remoteClientCreator) NewABCIClient() (abcicli.Client, error) {
 
 func DefaultClientCreator(addr, transport, dbDir string) ClientCreator {
 	switch addr {
+	case "counter":
+		return NewLocalClientCreator(counter.NewCounterApplication(false))
+	case "counter_serial":
+		return NewLocalClientCreator(counter.NewCounterApplication(true))
 	case "kvstore":
-		fallthrough
-	case "dummy":
 		return NewLocalClientCreator(kvstore.NewKVStoreApplication())
 	case "persistent_kvstore":
-		fallthrough
-	case "persistent_dummy":
 		return NewLocalClientCreator(kvstore.NewPersistentKVStoreApplication(dbDir))
-	case "nilapp":
+	case "noop":
 		return NewLocalClientCreator(types.NewBaseApplication())
 	default:
 		mustConnect := false // loop retrying
diff --git a/rpc/client/rpc_test.go b/rpc/client/rpc_test.go
index fa5080f90..dac7ec12d 100644
--- a/rpc/client/rpc_test.go
+++ b/rpc/client/rpc_test.go
@@ -428,5 +428,10 @@ func TestTxSearch(t *testing.T) {
 		if len(result.Txs) == 0 {
 			t.Fatal("expected a lot of transactions")
 		}
+
+		// query a non existing tx with page 1 and txsPerPage 1
+		result, err = c.TxSearch("app.creator='Cosmoshi Neetowoko'", true, 1, 1)
+		require.Nil(t, err, "%+v", err)
+		require.Len(t, result.Txs, 0)
 	}
 }
diff --git a/rpc/core/net.go b/rpc/core/net.go
index b80902dae..4d95c2ef0 100644
--- a/rpc/core/net.go
+++ b/rpc/core/net.go
@@ -53,6 +53,7 @@ func NetInfo() (*ctypes.ResultNetInfo, error) {
 			NodeInfo:         nodeInfo,
 			IsOutbound:       peer.IsOutbound(),
 			ConnectionStatus: peer.Status(),
+			RemoteIP:         peer.RemoteIP(),
 		})
 	}
 	// TODO: Should we include PersistentPeers and Seeds in here?
diff --git a/rpc/core/pipe.go b/rpc/core/pipe.go
index 7f4596541..3d745e6ad 100644
--- a/rpc/core/pipe.go
+++ b/rpc/core/pipe.go
@@ -154,3 +154,12 @@ func validatePerPage(perPage int) int {
 	}
 	return perPage
 }
+
+func validateSkipCount(page, perPage int) int {
+	skipCount := (page - 1) * perPage
+	if skipCount < 0 {
+		return 0
+	}
+
+	return skipCount
+}
diff --git a/rpc/core/tx.go b/rpc/core/tx.go
index 3bb0f28e8..f1bfd56a1 100644
--- a/rpc/core/tx.go
+++ b/rpc/core/tx.go
@@ -201,10 +201,11 @@ func TxSearch(query string, prove bool, page, perPage int) (*ctypes.ResultTxSear
 	totalCount := len(results)
 	perPage = validatePerPage(perPage)
 	page = validatePage(page, perPage, totalCount)
-	skipCount := (page - 1) * perPage
+	skipCount := validateSkipCount(page, perPage)
 
 	apiResults := make([]*ctypes.ResultTx, cmn.MinInt(perPage, totalCount-skipCount))
 	var proof types.TxProof
+	// if there's no tx in the results array, we don't need to loop through the apiResults array
 	for i := 0; i < len(apiResults); i++ {
 		r := results[skipCount+i]
 		height := r.Height
diff --git a/rpc/core/types/responses.go b/rpc/core/types/responses.go
index af5c4947f..62be1cafd 100644
--- a/rpc/core/types/responses.go
+++ b/rpc/core/types/responses.go
@@ -2,6 +2,7 @@ package core_types
 
 import (
 	"encoding/json"
+	"net"
 	"time"
 
 	abci "github.com/tendermint/tendermint/abci/types"
@@ -110,6 +111,7 @@ type Peer struct {
 	NodeInfo         p2p.DefaultNodeInfo  `json:"node_info"`
 	IsOutbound       bool                 `json:"is_outbound"`
 	ConnectionStatus p2p.ConnectionStatus `json:"connection_status"`
+	RemoteIP         net.IP               `json:"remote_ip"`
 }
 
 // Validators for a height
diff --git a/rpc/test/helpers.go b/rpc/test/helpers.go
index e68ec1490..b89c0a177 100644
--- a/rpc/test/helpers.go
+++ b/rpc/test/helpers.go
@@ -119,8 +119,9 @@ func NewTendermint(app abci.Application) *nm.Node {
 	config := GetConfig()
 	logger := log.NewTMLogger(log.NewSyncWriter(os.Stdout))
 	logger = log.NewFilter(logger, log.AllowError())
-	pvFile := config.PrivValidatorFile()
-	pv := privval.LoadOrGenFilePV(pvFile)
+	pvKeyFile := config.PrivValidatorKeyFile()
+	pvKeyStateFile := config.PrivValidatorStateFile()
+	pv := privval.LoadOrGenFilePV(pvKeyFile, pvKeyStateFile)
 	papp := proxy.NewLocalClientCreator(app)
 	nodeKey, err := p2p.LoadOrGenNodeKey(config.NodeKeyFile())
 	if err != nil {
diff --git a/scripts/dist.sh b/scripts/dist.sh
index 40aa71e98..f999c5376 100755
--- a/scripts/dist.sh
+++ b/scripts/dist.sh
@@ -6,7 +6,7 @@ set -e
 
 # Get the version from the environment, or try to figure it out.
 if [ -z $VERSION ]; then
-	VERSION=$(awk -F\" '/Version =/ { print $2; exit }' < version/version.go)
+	VERSION=$(awk -F\" 'TMCoreSemVer =/ { print $2; exit }' < version/version.go)
 fi
 if [ -z "$VERSION" ]; then
     echo "Please specify a version."
diff --git a/scripts/install/install_tendermint_arm.sh b/scripts/install/install_tendermint_arm.sh
index 2e8d50aef..06a20f14d 100644
--- a/scripts/install/install_tendermint_arm.sh
+++ b/scripts/install/install_tendermint_arm.sh
@@ -1,19 +1,11 @@
 #!/usr/bin/env bash
 
-# XXX: this script is intended to be run from
-# a fresh Digital Ocean droplet with Ubuntu
-
-# upon its completion, you must either reset
-# your terminal or run `source ~/.profile`
-
-# as written, this script will install
-# tendermint core from master branch
 REPO=github.com/tendermint/tendermint
 
 # change this to a specific release or branch
 BRANCH=master
 
-GO_VERSION=1.11.2
+GO_VERSION=1.11.4
 
 sudo apt-get update -y
 
diff --git a/scripts/install/install_tendermint_bsd.sh b/scripts/install/install_tendermint_bsd.sh
index 0f7ef9b5e..c3834058e 100644
--- a/scripts/install/install_tendermint_bsd.sh
+++ b/scripts/install/install_tendermint_bsd.sh
@@ -16,7 +16,7 @@
 set BRANCH=master
 set REPO=github.com/tendermint/tendermint
 
-set GO_VERSION=1.11.2
+set GO_VERSION=1.11.4
 
 sudo pkg update
 
diff --git a/scripts/install/install_tendermint_ubuntu.sh b/scripts/install/install_tendermint_ubuntu.sh
index 91ca1598d..59ab7a0a5 100644
--- a/scripts/install/install_tendermint_ubuntu.sh
+++ b/scripts/install/install_tendermint_ubuntu.sh
@@ -13,7 +13,7 @@ REPO=github.com/tendermint/tendermint
 # change this to a specific release or branch
 BRANCH=master
 
-GO_VERSION=1.11.2
+GO_VERSION=1.11.4
 
 sudo apt-get update -y
 sudo apt-get install -y make
diff --git a/scripts/privValUpgrade.go b/scripts/privValUpgrade.go
new file mode 100644
index 000000000..72ce505ee
--- /dev/null
+++ b/scripts/privValUpgrade.go
@@ -0,0 +1,41 @@
+package main
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/tendermint/tendermint/libs/log"
+	"github.com/tendermint/tendermint/privval"
+)
+
+var (
+	logger = log.NewTMLogger(log.NewSyncWriter(os.Stdout))
+)
+
+func main() {
+	args := os.Args[1:]
+	if len(args) != 3 {
+		fmt.Println("Expected three args: <old path> <new key path> <new state path>")
+		fmt.Println("Eg. ~/.tendermint/config/priv_validator.json ~/.tendermint/config/priv_validator_key.json ~/.tendermint/data/priv_validator_state.json")
+		os.Exit(1)
+	}
+	err := loadAndUpgrade(args[0], args[1], args[2])
+	if err != nil {
+		fmt.Println(err)
+		os.Exit(1)
+	}
+}
+
+func loadAndUpgrade(oldPVPath, newPVKeyPath, newPVStatePath string) error {
+	oldPV, err := privval.LoadOldFilePV(oldPVPath)
+	if err != nil {
+		return fmt.Errorf("Error reading OldPrivValidator from %v: %v\n", oldPVPath, err)
+	}
+	logger.Info("Upgrading PrivValidator file",
+		"old", oldPVPath,
+		"newKey", newPVKeyPath,
+		"newState", newPVStatePath,
+	)
+	oldPV.Upgrade(newPVKeyPath, newPVStatePath)
+	return nil
+}
diff --git a/scripts/privValUpgrade_test.go b/scripts/privValUpgrade_test.go
new file mode 100644
index 000000000..bac4d315f
--- /dev/null
+++ b/scripts/privValUpgrade_test.go
@@ -0,0 +1,121 @@
+package main
+
+import (
+	"fmt"
+	"io/ioutil"
+	"os"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+	"github.com/tendermint/tendermint/privval"
+)
+
+const oldPrivvalContent = `{
+  "address": "1D8089FAFDFAE4A637F3D616E17B92905FA2D91D",
+  "pub_key": {
+    "type": "tendermint/PubKeyEd25519",
+    "value": "r3Yg2AhDZ745CNTpavsGU+mRZ8WpRXqoJuyqjN8mJq0="
+  },
+  "last_height": "5",
+  "last_round": "0",
+  "last_step": 3,
+  "last_signature": "CTr7b9ZQlrJJf+12rPl5t/YSCUc/KqV7jQogCfFJA24e7hof69X6OMT7eFLVQHyodPjD/QTA298XHV5ejxInDQ==",
+  "last_signbytes": "750802110500000000000000220B08B398F3E00510F48DA6402A480A20FC258973076512999C3E6839A22E9FBDB1B77CF993E8A9955412A41A59D4CAD312240A20C971B286ACB8AAA6FCA0365EB0A660B189EDC08B46B5AF2995DEFA51A28D215B10013211746573742D636861696E2D533245415533",
+  "priv_key": {
+    "type": "tendermint/PrivKeyEd25519",
+    "value": "7MwvTGEWWjsYwjn2IpRb+GYsWi9nnFsw8jPLLY1UtP6vdiDYCENnvjkI1Olq+wZT6ZFnxalFeqgm7KqM3yYmrQ=="
+  }
+}`
+
+func TestLoadAndUpgrade(t *testing.T) {
+
+	oldFilePath := initTmpOldFile(t)
+	defer os.Remove(oldFilePath)
+	newStateFile, err := ioutil.TempFile("", "priv_validator_state*.json")
+	defer os.Remove(newStateFile.Name())
+	require.NoError(t, err)
+	newKeyFile, err := ioutil.TempFile("", "priv_validator_key*.json")
+	defer os.Remove(newKeyFile.Name())
+	require.NoError(t, err)
+	emptyOldFile, err := ioutil.TempFile("", "priv_validator_empty*.json")
+	require.NoError(t, err)
+	defer os.Remove(emptyOldFile.Name())
+
+	type args struct {
+		oldPVPath      string
+		newPVKeyPath   string
+		newPVStatePath string
+	}
+	tests := []struct {
+		name      string
+		args      args
+		wantErr   bool
+		wantPanic bool
+	}{
+		{"successful upgrade",
+			args{oldPVPath: oldFilePath, newPVKeyPath: newKeyFile.Name(), newPVStatePath: newStateFile.Name()},
+			false, false,
+		},
+		{"unsuccessful upgrade: empty old privval file",
+			args{oldPVPath: emptyOldFile.Name(), newPVKeyPath: newKeyFile.Name(), newPVStatePath: newStateFile.Name()},
+			true, false,
+		},
+		{"unsuccessful upgrade: invalid new paths (1/3)",
+			args{oldPVPath: oldFilePath, newPVKeyPath: "", newPVStatePath: newStateFile.Name()},
+			false, true,
+		},
+		{"unsuccessful upgrade: invalid new paths (2/3)",
+			args{oldPVPath: oldFilePath, newPVKeyPath: newKeyFile.Name(), newPVStatePath: ""},
+			false, true,
+		},
+		{"unsuccessful upgrade: invalid new paths (3/3)",
+			args{oldPVPath: oldFilePath, newPVKeyPath: "", newPVStatePath: ""},
+			false, true,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			// need to re-write the file everytime because upgrading renames it
+			err := ioutil.WriteFile(oldFilePath, []byte(oldPrivvalContent), 0600)
+			require.NoError(t, err)
+			if tt.wantPanic {
+				require.Panics(t, func() { loadAndUpgrade(tt.args.oldPVPath, tt.args.newPVKeyPath, tt.args.newPVStatePath) })
+			} else {
+				err = loadAndUpgrade(tt.args.oldPVPath, tt.args.newPVKeyPath, tt.args.newPVStatePath)
+				if tt.wantErr {
+					assert.Error(t, err)
+					fmt.Println("ERR", err)
+				} else {
+					assert.NoError(t, err)
+					upgradedPV := privval.LoadFilePV(tt.args.newPVKeyPath, tt.args.newPVStatePath)
+					oldPV, err := privval.LoadOldFilePV(tt.args.oldPVPath + ".bak")
+					require.NoError(t, err)
+
+					assert.Equal(t, oldPV.Address, upgradedPV.Key.Address)
+					assert.Equal(t, oldPV.Address, upgradedPV.GetAddress())
+					assert.Equal(t, oldPV.PubKey, upgradedPV.Key.PubKey)
+					assert.Equal(t, oldPV.PubKey, upgradedPV.GetPubKey())
+					assert.Equal(t, oldPV.PrivKey, upgradedPV.Key.PrivKey)
+
+					assert.Equal(t, oldPV.LastHeight, upgradedPV.LastSignState.Height)
+					assert.Equal(t, oldPV.LastRound, upgradedPV.LastSignState.Round)
+					assert.Equal(t, oldPV.LastSignature, upgradedPV.LastSignState.Signature)
+					assert.Equal(t, oldPV.LastSignBytes, upgradedPV.LastSignState.SignBytes)
+					assert.Equal(t, oldPV.LastStep, upgradedPV.LastSignState.Step)
+
+				}
+			}
+		})
+	}
+}
+
+func initTmpOldFile(t *testing.T) string {
+	tmpfile, err := ioutil.TempFile("", "priv_validator_*.json")
+	require.NoError(t, err)
+	t.Logf("created test file %s", tmpfile.Name())
+	_, err = tmpfile.WriteString(oldPrivvalContent)
+	require.NoError(t, err)
+
+	return tmpfile.Name()
+}
diff --git a/scripts/publish.sh b/scripts/publish.sh
index ba9440878..7da299aaf 100755
--- a/scripts/publish.sh
+++ b/scripts/publish.sh
@@ -6,7 +6,7 @@ DIST_DIR=./build/dist
 
 # Get the version from the environment, or try to figure it out.
 if [ -z $VERSION ]; then
-	VERSION=$(awk -F\" '/Version =/ { print $2; exit }' < version/version.go)
+	VERSION=$(awk -F\" 'TMCoreSemVer =/ { print $2; exit }' < version/version.go)
 fi
 if [ -z "$VERSION" ]; then
     echo "Please specify a version."
diff --git a/scripts/release.sh b/scripts/release.sh
index 9a4e508e1..8c40d36b6 100755
--- a/scripts/release.sh
+++ b/scripts/release.sh
@@ -3,7 +3,7 @@ set -e
 
 # Get the version from the environment, or try to figure it out.
 if [ -z $VERSION ]; then
-	VERSION=$(awk -F\" '/Version =/ { print $2; exit }' < version/version.go)
+	VERSION=$(awk -F\" 'TMCoreSemVer =/ { print $2; exit }' < version/version.go)
 fi
 if [ -z "$VERSION" ]; then
     echo "Please specify a version."
diff --git a/scripts/wire2amino.go b/scripts/wire2amino.go
deleted file mode 100644
index 26069b505..000000000
--- a/scripts/wire2amino.go
+++ /dev/null
@@ -1,182 +0,0 @@
-package main
-
-import (
-	"encoding/json"
-	"fmt"
-	"io/ioutil"
-	"os"
-	"path/filepath"
-	"time"
-
-	"github.com/tendermint/go-amino"
-	"github.com/tendermint/tendermint/crypto/ed25519"
-	cryptoAmino "github.com/tendermint/tendermint/crypto/encoding/amino"
-
-	cmn "github.com/tendermint/tendermint/libs/common"
-
-	"github.com/tendermint/tendermint/p2p"
-	"github.com/tendermint/tendermint/privval"
-	"github.com/tendermint/tendermint/types"
-)
-
-type GenesisValidator struct {
-	PubKey Data   `json:"pub_key"`
-	Power  int64  `json:"power"`
-	Name   string `json:"name"`
-}
-
-type Genesis struct {
-	GenesisTime     time.Time              `json:"genesis_time"`
-	ChainID         string                 `json:"chain_id"`
-	ConsensusParams *types.ConsensusParams `json:"consensus_params,omitempty"`
-	Validators      []GenesisValidator     `json:"validators"`
-	AppHash         cmn.HexBytes           `json:"app_hash"`
-	AppState        json.RawMessage        `json:"app_state,omitempty"`
-	AppOptions      json.RawMessage        `json:"app_options,omitempty"` // DEPRECATED
-}
-
-type NodeKey struct {
-	PrivKey Data `json:"priv_key"`
-}
-
-type PrivVal struct {
-	Address    cmn.HexBytes `json:"address"`
-	LastHeight int64        `json:"last_height"`
-	LastRound  int          `json:"last_round"`
-	LastStep   int8         `json:"last_step"`
-	PubKey     Data         `json:"pub_key"`
-	PrivKey    Data         `json:"priv_key"`
-}
-
-type Data struct {
-	Type string       `json:"type"`
-	Data cmn.HexBytes `json:"data"`
-}
-
-func convertNodeKey(cdc *amino.Codec, jsonBytes []byte) ([]byte, error) {
-	var nodeKey NodeKey
-	err := json.Unmarshal(jsonBytes, &nodeKey)
-	if err != nil {
-		return nil, err
-	}
-
-	var privKey ed25519.PrivKeyEd25519
-	copy(privKey[:], nodeKey.PrivKey.Data)
-
-	nodeKeyNew := p2p.NodeKey{privKey}
-
-	bz, err := cdc.MarshalJSON(nodeKeyNew)
-	if err != nil {
-		return nil, err
-	}
-	return bz, nil
-}
-
-func convertPrivVal(cdc *amino.Codec, jsonBytes []byte) ([]byte, error) {
-	var privVal PrivVal
-	err := json.Unmarshal(jsonBytes, &privVal)
-	if err != nil {
-		return nil, err
-	}
-
-	var privKey ed25519.PrivKeyEd25519
-	copy(privKey[:], privVal.PrivKey.Data)
-
-	var pubKey ed25519.PubKeyEd25519
-	copy(pubKey[:], privVal.PubKey.Data)
-
-	privValNew := privval.FilePV{
-		Address:    pubKey.Address(),
-		PubKey:     pubKey,
-		LastHeight: privVal.LastHeight,
-		LastRound:  privVal.LastRound,
-		LastStep:   privVal.LastStep,
-		PrivKey:    privKey,
-	}
-
-	bz, err := cdc.MarshalJSON(privValNew)
-	if err != nil {
-		return nil, err
-	}
-	return bz, nil
-}
-
-func convertGenesis(cdc *amino.Codec, jsonBytes []byte) ([]byte, error) {
-	var genesis Genesis
-	err := json.Unmarshal(jsonBytes, &genesis)
-	if err != nil {
-		return nil, err
-	}
-
-	genesisNew := types.GenesisDoc{
-		GenesisTime:     genesis.GenesisTime,
-		ChainID:         genesis.ChainID,
-		ConsensusParams: genesis.ConsensusParams,
-		// Validators
-		AppHash:  genesis.AppHash,
-		AppState: genesis.AppState,
-	}
-
-	if genesis.AppOptions != nil {
-		genesisNew.AppState = genesis.AppOptions
-	}
-
-	for _, v := range genesis.Validators {
-		var pubKey ed25519.PubKeyEd25519
-		copy(pubKey[:], v.PubKey.Data)
-		genesisNew.Validators = append(
-			genesisNew.Validators,
-			types.GenesisValidator{
-				PubKey: pubKey,
-				Power:  v.Power,
-				Name:   v.Name,
-			},
-		)
-
-	}
-
-	bz, err := cdc.MarshalJSON(genesisNew)
-	if err != nil {
-		return nil, err
-	}
-	return bz, nil
-}
-
-func main() {
-	cdc := amino.NewCodec()
-	cryptoAmino.RegisterAmino(cdc)
-
-	args := os.Args[1:]
-	if len(args) != 1 {
-		fmt.Println("Please specify a file to convert")
-		os.Exit(1)
-	}
-
-	filePath := args[0]
-	fileName := filepath.Base(filePath)
-
-	fileBytes, err := ioutil.ReadFile(filePath)
-	if err != nil {
-		panic(err)
-	}
-
-	var bz []byte
-
-	switch fileName {
-	case "node_key.json":
-		bz, err = convertNodeKey(cdc, fileBytes)
-	case "priv_validator.json":
-		bz, err = convertPrivVal(cdc, fileBytes)
-	case "genesis.json":
-		bz, err = convertGenesis(cdc, fileBytes)
-	default:
-		fmt.Println("Expected file name to be in (node_key.json, priv_validator.json, genesis.json)")
-		os.Exit(1)
-	}
-
-	if err != nil {
-		panic(err)
-	}
-	fmt.Println(string(bz))
-
-}
diff --git a/types/evidence_test.go b/types/evidence_test.go
index a96b63a9e..1f1338cad 100644
--- a/types/evidence_test.go
+++ b/types/evidence_test.go
@@ -17,8 +17,9 @@ type voteData struct {
 }
 
 func makeVote(val PrivValidator, chainID string, valIndex int, height int64, round, step int, blockID BlockID) *Vote {
+	addr := val.GetPubKey().Address()
 	v := &Vote{
-		ValidatorAddress: val.GetAddress(),
+		ValidatorAddress: addr,
 		ValidatorIndex:   valIndex,
 		Height:           height,
 		Round:            round,
@@ -61,7 +62,7 @@ func TestEvidence(t *testing.T) {
 		{vote1, makeVote(val, chainID, 0, 10, 3, 1, blockID2), false},    // wrong round
 		{vote1, makeVote(val, chainID, 0, 10, 2, 2, blockID2), false},    // wrong step
 		{vote1, makeVote(val2, chainID, 0, 10, 2, 1, blockID), false},    // wrong validator
-		{vote1, badVote, false},                                          // signed by wrong key
+		{vote1, badVote, false}, // signed by wrong key
 	}
 
 	pubKey := val.GetPubKey()
diff --git a/types/params.go b/types/params.go
index ec8a8f576..91079e76b 100644
--- a/types/params.go
+++ b/types/params.go
@@ -34,7 +34,7 @@ type EvidenceParams struct {
 }
 
 // ValidatorParams restrict the public key types validators can use.
-// NOTE: uses ABCI pubkey naming, not Amino routes.
+// NOTE: uses ABCI pubkey naming, not Amino names.
 type ValidatorParams struct {
 	PubKeyTypes []string `json:"pub_key_types"`
 }
@@ -107,7 +107,7 @@ func (params *ConsensusParams) Validate() error {
 	// Check if keyType is a known ABCIPubKeyType
 	for i := 0; i < len(params.Validator.PubKeyTypes); i++ {
 		keyType := params.Validator.PubKeyTypes[i]
-		if _, ok := ABCIPubKeyTypesToAminoRoutes[keyType]; !ok {
+		if _, ok := ABCIPubKeyTypesToAminoNames[keyType]; !ok {
 			return cmn.NewError("params.Validator.PubKeyTypes[%d], %s, is an unknown pubkey type",
 				i, keyType)
 		}
diff --git a/types/priv_validator.go b/types/priv_validator.go
index ebd644467..f0a19f401 100644
--- a/types/priv_validator.go
+++ b/types/priv_validator.go
@@ -12,7 +12,6 @@ import (
 // PrivValidator defines the functionality of a local Tendermint validator
 // that signs votes and proposals, and never double signs.
 type PrivValidator interface {
-	GetAddress() Address // redundant since .PubKey().Address()
 	GetPubKey() crypto.PubKey
 
 	SignVote(chainID string, vote *Vote) error
@@ -29,7 +28,7 @@ func (pvs PrivValidatorsByAddress) Len() int {
 }
 
 func (pvs PrivValidatorsByAddress) Less(i, j int) bool {
-	return bytes.Compare(pvs[i].GetAddress(), pvs[j].GetAddress()) == -1
+	return bytes.Compare(pvs[i].GetPubKey().Address(), pvs[j].GetPubKey().Address()) == -1
 }
 
 func (pvs PrivValidatorsByAddress) Swap(i, j int) {
@@ -51,11 +50,6 @@ func NewMockPV() *MockPV {
 	return &MockPV{ed25519.GenPrivKey()}
 }
 
-// Implements PrivValidator.
-func (pv *MockPV) GetAddress() Address {
-	return pv.privKey.PubKey().Address()
-}
-
 // Implements PrivValidator.
 func (pv *MockPV) GetPubKey() crypto.PubKey {
 	return pv.privKey.PubKey()
@@ -85,7 +79,8 @@ func (pv *MockPV) SignProposal(chainID string, proposal *Proposal) error {
 
 // String returns a string representation of the MockPV.
 func (pv *MockPV) String() string {
-	return fmt.Sprintf("MockPV{%v}", pv.GetAddress())
+	addr := pv.GetPubKey().Address()
+	return fmt.Sprintf("MockPV{%v}", addr)
 }
 
 // XXX: Implement.
diff --git a/types/protobuf.go b/types/protobuf.go
index 0f0d25de3..eed73b568 100644
--- a/types/protobuf.go
+++ b/types/protobuf.go
@@ -25,9 +25,9 @@ const (
 )
 
 // TODO: Make non-global by allowing for registration of more pubkey types
-var ABCIPubKeyTypesToAminoRoutes = map[string]string{
-	ABCIPubKeyTypeEd25519:   ed25519.PubKeyAminoRoute,
-	ABCIPubKeyTypeSecp256k1: secp256k1.PubKeyAminoRoute,
+var ABCIPubKeyTypesToAminoNames = map[string]string{
+	ABCIPubKeyTypeEd25519:   ed25519.PubKeyAminoName,
+	ABCIPubKeyTypeSecp256k1: secp256k1.PubKeyAminoName,
 }
 
 //-------------------------------------------------------
diff --git a/types/protobuf_test.go b/types/protobuf_test.go
index f5a2ce5d4..18acf57a6 100644
--- a/types/protobuf_test.go
+++ b/types/protobuf_test.go
@@ -142,14 +142,15 @@ func TestABCIEvidence(t *testing.T) {
 	blockID := makeBlockID([]byte("blockhash"), 1000, []byte("partshash"))
 	blockID2 := makeBlockID([]byte("blockhash2"), 1000, []byte("partshash"))
 	const chainID = "mychain"
+	pubKey := val.GetPubKey()
 	ev := &DuplicateVoteEvidence{
-		PubKey: val.GetPubKey(),
+		PubKey: pubKey,
 		VoteA:  makeVote(val, chainID, 0, 10, 2, 1, blockID),
 		VoteB:  makeVote(val, chainID, 0, 10, 2, 1, blockID2),
 	}
 	abciEv := TM2PB.Evidence(
 		ev,
-		NewValidatorSet([]*Validator{NewValidator(val.GetPubKey(), 10)}),
+		NewValidatorSet([]*Validator{NewValidator(pubKey, 10)}),
 		time.Now(),
 	)
 
diff --git a/types/test_util.go b/types/test_util.go
index 80f0c7872..18e472148 100644
--- a/types/test_util.go
+++ b/types/test_util.go
@@ -10,9 +10,9 @@ func MakeCommit(blockID BlockID, height int64, round int,
 
 	// all sign
 	for i := 0; i < len(validators); i++ {
-
+		addr := validators[i].GetPubKey().Address()
 		vote := &Vote{
-			ValidatorAddress: validators[i].GetAddress(),
+			ValidatorAddress: addr,
 			ValidatorIndex:   i,
 			Height:           height,
 			Round:            round,
diff --git a/types/tx_test.go b/types/tx_test.go
index 3afaaccc1..5cdadce52 100644
--- a/types/tx_test.go
+++ b/types/tx_test.go
@@ -103,9 +103,9 @@ func TestComputeTxsOverhead(t *testing.T) {
 	}{
 		{Txs{[]byte{6, 6, 6, 6, 6, 6}}, 2},
 		// one 21 Mb transaction:
-		{Txs{make([]byte, 22020096, 22020096)}, 5},
+		{Txs{make([]byte, 22020096)}, 5},
 		// two 21Mb/2 sized transactions:
-		{Txs{make([]byte, 11010048, 11010048), make([]byte, 11010048, 11010048)}, 10},
+		{Txs{make([]byte, 11010048), make([]byte, 11010048)}, 10},
 		{Txs{[]byte{1, 2, 3}, []byte{1, 2, 3}, []byte{4, 5, 6}}, 6},
 		{Txs{[]byte{100, 5, 64}, []byte{42, 116, 118}, []byte{6, 6, 6}, []byte{6, 6, 6}}, 8},
 	}
diff --git a/types/validator.go b/types/validator.go
index b7c6c6792..1de326b00 100644
--- a/types/validator.go
+++ b/types/validator.go
@@ -101,6 +101,7 @@ func RandValidator(randPower bool, minPower int64) (*Validator, PrivValidator) {
 	if randPower {
 		votePower += int64(cmn.RandUint32())
 	}
-	val := NewValidator(privVal.GetPubKey(), votePower)
+	pubKey := privVal.GetPubKey()
+	val := NewValidator(pubKey, votePower)
 	return val, privVal
 }
diff --git a/types/vote_set_test.go b/types/vote_set_test.go
index 641872920..59205efc6 100644
--- a/types/vote_set_test.go
+++ b/types/vote_set_test.go
@@ -66,7 +66,8 @@ func TestAddVote(t *testing.T) {
 
 	// t.Logf(">> %v", voteSet)
 
-	if voteSet.GetByAddress(val0.GetAddress()) != nil {
+	val0Addr := val0.GetPubKey().Address()
+	if voteSet.GetByAddress(val0Addr) != nil {
 		t.Errorf("Expected GetByAddress(val0.Address) to be nil")
 	}
 	if voteSet.BitArray().GetIndex(0) {
@@ -78,7 +79,7 @@ func TestAddVote(t *testing.T) {
 	}
 
 	vote := &Vote{
-		ValidatorAddress: val0.GetAddress(),
+		ValidatorAddress: val0Addr,
 		ValidatorIndex:   0, // since privValidators are in order
 		Height:           height,
 		Round:            round,
@@ -91,7 +92,7 @@ func TestAddVote(t *testing.T) {
 		t.Error(err)
 	}
 
-	if voteSet.GetByAddress(val0.GetAddress()) == nil {
+	if voteSet.GetByAddress(val0Addr) == nil {
 		t.Errorf("Expected GetByAddress(val0.Address) to be present")
 	}
 	if !voteSet.BitArray().GetIndex(0) {
@@ -118,7 +119,8 @@ func Test2_3Majority(t *testing.T) {
 	}
 	// 6 out of 10 voted for nil.
 	for i := 0; i < 6; i++ {
-		vote := withValidator(voteProto, privValidators[i].GetAddress(), i)
+		addr := privValidators[i].GetPubKey().Address()
+		vote := withValidator(voteProto, addr, i)
 		_, err := signAddVote(privValidators[i], vote, voteSet)
 		if err != nil {
 			t.Error(err)
@@ -131,7 +133,8 @@ func Test2_3Majority(t *testing.T) {
 
 	// 7th validator voted for some blockhash
 	{
-		vote := withValidator(voteProto, privValidators[6].GetAddress(), 6)
+		addr := privValidators[6].GetPubKey().Address()
+		vote := withValidator(voteProto, addr, 6)
 		_, err := signAddVote(privValidators[6], withBlockHash(vote, cmn.RandBytes(32)), voteSet)
 		if err != nil {
 			t.Error(err)
@@ -144,7 +147,8 @@ func Test2_3Majority(t *testing.T) {
 
 	// 8th validator voted for nil.
 	{
-		vote := withValidator(voteProto, privValidators[7].GetAddress(), 7)
+		addr := privValidators[7].GetPubKey().Address()
+		vote := withValidator(voteProto, addr, 7)
 		_, err := signAddVote(privValidators[7], vote, voteSet)
 		if err != nil {
 			t.Error(err)
@@ -176,7 +180,8 @@ func Test2_3MajorityRedux(t *testing.T) {
 
 	// 66 out of 100 voted for nil.
 	for i := 0; i < 66; i++ {
-		vote := withValidator(voteProto, privValidators[i].GetAddress(), i)
+		addr := privValidators[i].GetPubKey().Address()
+		vote := withValidator(voteProto, addr, i)
 		_, err := signAddVote(privValidators[i], vote, voteSet)
 		if err != nil {
 			t.Error(err)
@@ -189,7 +194,8 @@ func Test2_3MajorityRedux(t *testing.T) {
 
 	// 67th validator voted for nil
 	{
-		vote := withValidator(voteProto, privValidators[66].GetAddress(), 66)
+		adrr := privValidators[66].GetPubKey().Address()
+		vote := withValidator(voteProto, adrr, 66)
 		_, err := signAddVote(privValidators[66], withBlockHash(vote, nil), voteSet)
 		if err != nil {
 			t.Error(err)
@@ -202,7 +208,8 @@ func Test2_3MajorityRedux(t *testing.T) {
 
 	// 68th validator voted for a different BlockParts PartSetHeader
 	{
-		vote := withValidator(voteProto, privValidators[67].GetAddress(), 67)
+		addr := privValidators[67].GetPubKey().Address()
+		vote := withValidator(voteProto, addr, 67)
 		blockPartsHeader := PartSetHeader{blockPartsTotal, crypto.CRandBytes(32)}
 		_, err := signAddVote(privValidators[67], withBlockPartsHeader(vote, blockPartsHeader), voteSet)
 		if err != nil {
@@ -216,7 +223,8 @@ func Test2_3MajorityRedux(t *testing.T) {
 
 	// 69th validator voted for different BlockParts Total
 	{
-		vote := withValidator(voteProto, privValidators[68].GetAddress(), 68)
+		addr := privValidators[68].GetPubKey().Address()
+		vote := withValidator(voteProto, addr, 68)
 		blockPartsHeader := PartSetHeader{blockPartsTotal + 1, blockPartsHeader.Hash}
 		_, err := signAddVote(privValidators[68], withBlockPartsHeader(vote, blockPartsHeader), voteSet)
 		if err != nil {
@@ -230,7 +238,8 @@ func Test2_3MajorityRedux(t *testing.T) {
 
 	// 70th validator voted for different BlockHash
 	{
-		vote := withValidator(voteProto, privValidators[69].GetAddress(), 69)
+		addr := privValidators[69].GetPubKey().Address()
+		vote := withValidator(voteProto, addr, 69)
 		_, err := signAddVote(privValidators[69], withBlockHash(vote, cmn.RandBytes(32)), voteSet)
 		if err != nil {
 			t.Error(err)
@@ -243,7 +252,8 @@ func Test2_3MajorityRedux(t *testing.T) {
 
 	// 71st validator voted for the right BlockHash & BlockPartsHeader
 	{
-		vote := withValidator(voteProto, privValidators[70].GetAddress(), 70)
+		addr := privValidators[70].GetPubKey().Address()
+		vote := withValidator(voteProto, addr, 70)
 		_, err := signAddVote(privValidators[70], vote, voteSet)
 		if err != nil {
 			t.Error(err)
@@ -271,7 +281,8 @@ func TestBadVotes(t *testing.T) {
 
 	// val0 votes for nil.
 	{
-		vote := withValidator(voteProto, privValidators[0].GetAddress(), 0)
+		addr := privValidators[0].GetPubKey().Address()
+		vote := withValidator(voteProto, addr, 0)
 		added, err := signAddVote(privValidators[0], vote, voteSet)
 		if !added || err != nil {
 			t.Errorf("Expected VoteSet.Add to succeed")
@@ -280,7 +291,8 @@ func TestBadVotes(t *testing.T) {
 
 	// val0 votes again for some block.
 	{
-		vote := withValidator(voteProto, privValidators[0].GetAddress(), 0)
+		addr := privValidators[0].GetPubKey().Address()
+		vote := withValidator(voteProto, addr, 0)
 		added, err := signAddVote(privValidators[0], withBlockHash(vote, cmn.RandBytes(32)), voteSet)
 		if added || err == nil {
 			t.Errorf("Expected VoteSet.Add to fail, conflicting vote.")
@@ -289,7 +301,8 @@ func TestBadVotes(t *testing.T) {
 
 	// val1 votes on another height
 	{
-		vote := withValidator(voteProto, privValidators[1].GetAddress(), 1)
+		addr := privValidators[1].GetPubKey().Address()
+		vote := withValidator(voteProto, addr, 1)
 		added, err := signAddVote(privValidators[1], withHeight(vote, height+1), voteSet)
 		if added || err == nil {
 			t.Errorf("Expected VoteSet.Add to fail, wrong height")
@@ -298,7 +311,8 @@ func TestBadVotes(t *testing.T) {
 
 	// val2 votes on another round
 	{
-		vote := withValidator(voteProto, privValidators[2].GetAddress(), 2)
+		addr := privValidators[2].GetPubKey().Address()
+		vote := withValidator(voteProto, addr, 2)
 		added, err := signAddVote(privValidators[2], withRound(vote, round+1), voteSet)
 		if added || err == nil {
 			t.Errorf("Expected VoteSet.Add to fail, wrong round")
@@ -307,7 +321,8 @@ func TestBadVotes(t *testing.T) {
 
 	// val3 votes of another type.
 	{
-		vote := withValidator(voteProto, privValidators[3].GetAddress(), 3)
+		addr := privValidators[3].GetPubKey().Address()
+		vote := withValidator(voteProto, addr, 3)
 		added, err := signAddVote(privValidators[3], withType(vote, byte(PrecommitType)), voteSet)
 		if added || err == nil {
 			t.Errorf("Expected VoteSet.Add to fail, wrong type")
@@ -331,9 +346,10 @@ func TestConflicts(t *testing.T) {
 		BlockID:          BlockID{nil, PartSetHeader{}},
 	}
 
+	val0Addr := privValidators[0].GetPubKey().Address()
 	// val0 votes for nil.
 	{
-		vote := withValidator(voteProto, privValidators[0].GetAddress(), 0)
+		vote := withValidator(voteProto, val0Addr, 0)
 		added, err := signAddVote(privValidators[0], vote, voteSet)
 		if !added || err != nil {
 			t.Errorf("Expected VoteSet.Add to succeed")
@@ -342,7 +358,7 @@ func TestConflicts(t *testing.T) {
 
 	// val0 votes again for blockHash1.
 	{
-		vote := withValidator(voteProto, privValidators[0].GetAddress(), 0)
+		vote := withValidator(voteProto, val0Addr, 0)
 		added, err := signAddVote(privValidators[0], withBlockHash(vote, blockHash1), voteSet)
 		if added {
 			t.Errorf("Expected VoteSet.Add to fail, conflicting vote.")
@@ -357,7 +373,7 @@ func TestConflicts(t *testing.T) {
 
 	// val0 votes again for blockHash1.
 	{
-		vote := withValidator(voteProto, privValidators[0].GetAddress(), 0)
+		vote := withValidator(voteProto, val0Addr, 0)
 		added, err := signAddVote(privValidators[0], withBlockHash(vote, blockHash1), voteSet)
 		if !added {
 			t.Errorf("Expected VoteSet.Add to succeed, called SetPeerMaj23().")
@@ -372,7 +388,7 @@ func TestConflicts(t *testing.T) {
 
 	// val0 votes again for blockHash1.
 	{
-		vote := withValidator(voteProto, privValidators[0].GetAddress(), 0)
+		vote := withValidator(voteProto, val0Addr, 0)
 		added, err := signAddVote(privValidators[0], withBlockHash(vote, blockHash2), voteSet)
 		if added {
 			t.Errorf("Expected VoteSet.Add to fail, duplicate SetPeerMaj23() from peerA")
@@ -384,7 +400,8 @@ func TestConflicts(t *testing.T) {
 
 	// val1 votes for blockHash1.
 	{
-		vote := withValidator(voteProto, privValidators[1].GetAddress(), 1)
+		addr := privValidators[1].GetPubKey().Address()
+		vote := withValidator(voteProto, addr, 1)
 		added, err := signAddVote(privValidators[1], withBlockHash(vote, blockHash1), voteSet)
 		if !added || err != nil {
 			t.Errorf("Expected VoteSet.Add to succeed")
@@ -401,7 +418,8 @@ func TestConflicts(t *testing.T) {
 
 	// val2 votes for blockHash2.
 	{
-		vote := withValidator(voteProto, privValidators[2].GetAddress(), 2)
+		addr := privValidators[2].GetPubKey().Address()
+		vote := withValidator(voteProto, addr, 2)
 		added, err := signAddVote(privValidators[2], withBlockHash(vote, blockHash2), voteSet)
 		if !added || err != nil {
 			t.Errorf("Expected VoteSet.Add to succeed")
@@ -421,7 +439,8 @@ func TestConflicts(t *testing.T) {
 
 	// val2 votes for blockHash1.
 	{
-		vote := withValidator(voteProto, privValidators[2].GetAddress(), 2)
+		addr := privValidators[2].GetPubKey().Address()
+		vote := withValidator(voteProto, addr, 2)
 		added, err := signAddVote(privValidators[2], withBlockHash(vote, blockHash1), voteSet)
 		if !added {
 			t.Errorf("Expected VoteSet.Add to succeed")
@@ -462,7 +481,8 @@ func TestMakeCommit(t *testing.T) {
 
 	// 6 out of 10 voted for some block.
 	for i := 0; i < 6; i++ {
-		vote := withValidator(voteProto, privValidators[i].GetAddress(), i)
+		addr := privValidators[i].GetPubKey().Address()
+		vote := withValidator(voteProto, addr, i)
 		_, err := signAddVote(privValidators[i], vote, voteSet)
 		if err != nil {
 			t.Error(err)
@@ -474,7 +494,8 @@ func TestMakeCommit(t *testing.T) {
 
 	// 7th voted for some other block.
 	{
-		vote := withValidator(voteProto, privValidators[6].GetAddress(), 6)
+		addr := privValidators[6].GetPubKey().Address()
+		vote := withValidator(voteProto, addr, 6)
 		vote = withBlockHash(vote, cmn.RandBytes(32))
 		vote = withBlockPartsHeader(vote, PartSetHeader{123, cmn.RandBytes(32)})
 
@@ -486,7 +507,8 @@ func TestMakeCommit(t *testing.T) {
 
 	// The 8th voted like everyone else.
 	{
-		vote := withValidator(voteProto, privValidators[7].GetAddress(), 7)
+		addr := privValidators[7].GetPubKey().Address()
+		vote := withValidator(voteProto, addr, 7)
 		_, err := signAddVote(privValidators[7], vote, voteSet)
 		if err != nil {
 			t.Error(err)
diff --git a/version/version.go b/version/version.go
index 3cbdab02f..658e0e89d 100644
--- a/version/version.go
+++ b/version/version.go
@@ -18,7 +18,7 @@ const (
 	// TMCoreSemVer is the current version of Tendermint Core.
 	// It's the Semantic Version of the software.
 	// Must be a string because scripts like dist.sh read this file.
-	TMCoreSemVer = "0.27.4"
+	TMCoreSemVer = "0.28.0"
 
 	// ABCISemVer is the semantic version of the ABCI library
 	ABCISemVer  = "0.15.0"