diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8dba7032b..b1449a436 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -12,6 +12,8 @@ BREAKING CHANGES:
  - [types] switched to using `gogo/protobuf` for code generation
  - [types] use `customtype` feature of `gogo/protobuf` to replace `[]byte` with `data.Bytes` in all generated types :)
     - this eliminates the need for additional types like ResultQuery
+ - [types] `pubKey` -> `pub_key`
+ - [types] `uint64` -> `int64`
  - [abci-cli] codes are printed as their number instead of a message, except for `code == 0`, which is still printed as `OK`
 
 FEATURES:
diff --git a/Makefile b/Makefile
index e6a7af362..ebe8f3a9a 100644
--- a/Makefile
+++ b/Makefile
@@ -6,6 +6,8 @@ GOTOOLS = \
 					github.com/gogo/protobuf/protoc-gen-gogo \
 					github.com/gogo/protobuf/gogoproto
 
+INCLUDE = -I=. -I=${GOPATH}/src -I=${GOPATH}/src/github.com/gogo/protobuf/protobuf
+
 all: install test
 
 PACKAGES=$(shell go list ./... | grep -v '/vendor/')
@@ -24,7 +26,7 @@ protoc:
 	## On "error while loading shared libraries: libprotobuf.so.14: cannot open shared object file: No such file or directory"
 	##   ldconfig (may require sudo)
 	## https://stackoverflow.com/a/25518702
-	protoc -I=. -I=${GOPATH}/src -I=${GOPATH}/src/github.com/gogo/protobuf/protobuf --gogo_out=plugins=grpc:. types/*.proto
+	protoc $(INCLUDE) --gogo_out=plugins=grpc:. types/*.proto
 
 install:
 	@ go install ./cmd/...
@@ -67,11 +69,11 @@ get_vendor_deps: ensure_tools
 	@ glide install
 
 metalinter:
-	protoc --lint_out=. types/*.proto
+	protoc $(INCLUDE) --lint_out=. types/*.proto
 	gometalinter --vendor --deadline=600s --enable-all --disable=lll ./...
 
 metalinter_test:
-	# protoc --lint_out=. types/*.proto
+	protoc $(INCLUDE) --lint_out=. types/*.proto
 	gometalinter --vendor --deadline=600s --disable-all  \
 		--enable=maligned \
 		--enable=deadcode \
diff --git a/example/dummy/dummy_test.go b/example/dummy/dummy_test.go
index 738da6e85..ec4d2e33d 100644
--- a/example/dummy/dummy_test.go
+++ b/example/dummy/dummy_test.go
@@ -82,7 +82,7 @@ func TestPersistentDummyInfo(t *testing.T) {
 	}
 	dummy := NewPersistentDummyApplication(dir)
 	InitDummy(dummy)
-	height := uint64(0)
+	height := int64(0)
 
 	resInfo := dummy.Info(types.RequestInfo{})
 	if resInfo.LastBlockHeight != height {
@@ -90,10 +90,10 @@ func TestPersistentDummyInfo(t *testing.T) {
 	}
 
 	// make and apply block
-	height = uint64(1)
+	height = int64(1)
 	hash := []byte("foo")
 	header := &types.Header{
-		Height: uint64(height),
+		Height: int64(height),
 	}
 	dummy.BeginBlock(types.RequestBeginBlock{hash, header})
 	dummy.EndBlock(types.RequestEndBlock{header.Height})
@@ -173,7 +173,7 @@ func TestValSetChanges(t *testing.T) {
 
 func makeApplyBlock(t *testing.T, dummy types.Application, heightInt int, diff []*types.Validator, txs ...[]byte) {
 	// make and apply block
-	height := uint64(heightInt)
+	height := int64(heightInt)
 	hash := []byte("foo")
 	header := &types.Header{
 		Height: height,
diff --git a/example/dummy/helpers.go b/example/dummy/helpers.go
index 55c464de0..d6b4338c6 100644
--- a/example/dummy/helpers.go
+++ b/example/dummy/helpers.go
@@ -11,7 +11,7 @@ import (
 func RandVal(i int) *types.Validator {
 	pubkey := crypto.GenPrivKeyEd25519FromSecret([]byte(cmn.Fmt("test%d", i))).PubKey().Bytes()
 	power := cmn.RandUint16() + 1
-	return &types.Validator{pubkey, uint64(power)}
+	return &types.Validator{pubkey, int64(power)}
 }
 
 // RandVals returns a list of cnt validators for initializing
diff --git a/example/dummy/persistent_dummy.go b/example/dummy/persistent_dummy.go
index 1d72bea14..6f389c507 100644
--- a/example/dummy/persistent_dummy.go
+++ b/example/dummy/persistent_dummy.go
@@ -55,7 +55,8 @@ func (app *PersistentDummyApplication) SetLogger(l log.Logger) {
 
 func (app *PersistentDummyApplication) Info(req types.RequestInfo) types.ResponseInfo {
 	res := app.app.Info(req)
-	res.LastBlockHeight = app.app.state.LatestVersion()
+	var latestVersion uint64 = app.app.state.LatestVersion() // TODO: change to int64
+	res.LastBlockHeight = int64(latestVersion)
 	res.LastBlockAppHash = app.app.state.Hash()
 	return res
 }
@@ -145,7 +146,7 @@ func (app *PersistentDummyApplication) Validators() (validators []*types.Validat
 	return
 }
 
-func MakeValSetChangeTx(pubkey []byte, power uint64) []byte {
+func MakeValSetChangeTx(pubkey []byte, power int64) []byte {
 	return []byte(cmn.Fmt("val:%X/%d", pubkey, power))
 }
 
@@ -181,7 +182,7 @@ func (app *PersistentDummyApplication) execValidatorTx(tx []byte) types.Response
 	}
 
 	// decode the power
-	power, err := strconv.Atoi(powerS)
+	power, err := strconv.ParseInt(powerS, 10, 64)
 	if err != nil {
 		return types.ResponseDeliverTx{
 			Code: code.CodeTypeEncodingError,
@@ -189,7 +190,7 @@ func (app *PersistentDummyApplication) execValidatorTx(tx []byte) types.Response
 	}
 
 	// update
-	return app.updateValidator(&types.Validator{pubkey, uint64(power)})
+	return app.updateValidator(&types.Validator{pubkey, power})
 }
 
 // add, update, or remove a validator
diff --git a/types/types.pb.go b/types/types.pb.go
index 61a56cacf..094f3012f 100644
--- a/types/types.pb.go
+++ b/types/types.pb.go
@@ -582,7 +582,7 @@ func (m *RequestCheckTx) GetTx() []byte {
 type RequestQuery struct {
 	Data   []byte `protobuf:"bytes,1,opt,name=data,proto3" json:"data,omitempty"`
 	Path   string `protobuf:"bytes,2,opt,name=path,proto3" json:"path,omitempty"`
-	Height uint64 `protobuf:"varint,3,opt,name=height,proto3" json:"height,omitempty"`
+	Height int64  `protobuf:"varint,3,opt,name=height,proto3" json:"height,omitempty"`
 	Prove  bool   `protobuf:"varint,4,opt,name=prove,proto3" json:"prove,omitempty"`
 }
 
@@ -605,7 +605,7 @@ func (m *RequestQuery) GetPath() string {
 	return ""
 }
 
-func (m *RequestQuery) GetHeight() uint64 {
+func (m *RequestQuery) GetHeight() int64 {
 	if m != nil {
 		return m.Height
 	}
@@ -668,7 +668,7 @@ func (m *RequestBeginBlock) GetHeader() *Header {
 }
 
 type RequestEndBlock struct {
-	Height uint64 `protobuf:"varint,1,opt,name=height,proto3" json:"height,omitempty"`
+	Height int64 `protobuf:"varint,1,opt,name=height,proto3" json:"height,omitempty"`
 }
 
 func (m *RequestEndBlock) Reset()                    { *m = RequestEndBlock{} }
@@ -676,7 +676,7 @@ func (m *RequestEndBlock) String() string            { return proto.CompactTextS
 func (*RequestEndBlock) ProtoMessage()               {}
 func (*RequestEndBlock) Descriptor() ([]byte, []int) { return fileDescriptorTypes, []int{11} }
 
-func (m *RequestEndBlock) GetHeight() uint64 {
+func (m *RequestEndBlock) GetHeight() int64 {
 	if m != nil {
 		return m.Height
 	}
@@ -1157,7 +1157,7 @@ func (*ResponseFlush) Descriptor() ([]byte, []int) { return fileDescriptorTypes,
 type ResponseInfo struct {
 	Data             string `protobuf:"bytes,1,opt,name=data,proto3" json:"data,omitempty"`
 	Version          string `protobuf:"bytes,2,opt,name=version,proto3" json:"version,omitempty"`
-	LastBlockHeight  uint64 `protobuf:"varint,3,opt,name=last_block_height,json=lastBlockHeight,proto3" json:"last_block_height,omitempty"`
+	LastBlockHeight  int64  `protobuf:"varint,3,opt,name=last_block_height,json=lastBlockHeight,proto3" json:"last_block_height,omitempty"`
 	LastBlockAppHash []byte `protobuf:"bytes,4,opt,name=last_block_app_hash,json=lastBlockAppHash,proto3" json:"last_block_app_hash,omitempty"`
 }
 
@@ -1180,7 +1180,7 @@ func (m *ResponseInfo) GetVersion() string {
 	return ""
 }
 
-func (m *ResponseInfo) GetLastBlockHeight() uint64 {
+func (m *ResponseInfo) GetLastBlockHeight() int64 {
 	if m != nil {
 		return m.LastBlockHeight
 	}
@@ -1247,8 +1247,8 @@ type ResponseCheckTx struct {
 	Code uint32                                   `protobuf:"varint,1,opt,name=code,proto3" json:"code,omitempty"`
 	Data github_com_tendermint_go_wire_data.Bytes `protobuf:"bytes,2,opt,name=data,proto3,customtype=github.com/tendermint/go-wire/data.Bytes" json:"data"`
 	Log  string                                   `protobuf:"bytes,3,opt,name=log,proto3" json:"log,omitempty"`
-	Gas  uint64                                   `protobuf:"varint,4,opt,name=gas,proto3" json:"gas,omitempty"`
-	Fee  uint64                                   `protobuf:"varint,5,opt,name=fee,proto3" json:"fee,omitempty"`
+	Gas  int64                                    `protobuf:"varint,4,opt,name=gas,proto3" json:"gas,omitempty"`
+	Fee  int64                                    `protobuf:"varint,5,opt,name=fee,proto3" json:"fee,omitempty"`
 }
 
 func (m *ResponseCheckTx) Reset()                    { *m = ResponseCheckTx{} }
@@ -1270,14 +1270,14 @@ func (m *ResponseCheckTx) GetLog() string {
 	return ""
 }
 
-func (m *ResponseCheckTx) GetGas() uint64 {
+func (m *ResponseCheckTx) GetGas() int64 {
 	if m != nil {
 		return m.Gas
 	}
 	return 0
 }
 
-func (m *ResponseCheckTx) GetFee() uint64 {
+func (m *ResponseCheckTx) GetFee() int64 {
 	if m != nil {
 		return m.Fee
 	}
@@ -1290,7 +1290,7 @@ type ResponseQuery struct {
 	Key    github_com_tendermint_go_wire_data.Bytes `protobuf:"bytes,3,opt,name=key,proto3,customtype=github.com/tendermint/go-wire/data.Bytes" json:"key"`
 	Value  github_com_tendermint_go_wire_data.Bytes `protobuf:"bytes,4,opt,name=value,proto3,customtype=github.com/tendermint/go-wire/data.Bytes" json:"value"`
 	Proof  github_com_tendermint_go_wire_data.Bytes `protobuf:"bytes,5,opt,name=proof,proto3,customtype=github.com/tendermint/go-wire/data.Bytes" json:"proof"`
-	Height uint64                                   `protobuf:"varint,6,opt,name=height,proto3" json:"height,omitempty"`
+	Height int64                                    `protobuf:"varint,6,opt,name=height,proto3" json:"height,omitempty"`
 	Log    string                                   `protobuf:"bytes,7,opt,name=log,proto3" json:"log,omitempty"`
 }
 
@@ -1313,7 +1313,7 @@ func (m *ResponseQuery) GetIndex() int64 {
 	return 0
 }
 
-func (m *ResponseQuery) GetHeight() uint64 {
+func (m *ResponseQuery) GetHeight() int64 {
 	if m != nil {
 		return m.Height
 	}
@@ -1386,9 +1386,9 @@ func (m *ResponseEndBlock) GetDiffs() []*Validator {
 
 type Header struct {
 	ChainId        string   `protobuf:"bytes,1,opt,name=chain_id,json=chainId,proto3" json:"chain_id,omitempty"`
-	Height         uint64   `protobuf:"varint,2,opt,name=height,proto3" json:"height,omitempty"`
-	Time           uint64   `protobuf:"varint,3,opt,name=time,proto3" json:"time,omitempty"`
-	NumTxs         uint64   `protobuf:"varint,4,opt,name=num_txs,json=numTxs,proto3" json:"num_txs,omitempty"`
+	Height         int64    `protobuf:"varint,2,opt,name=height,proto3" json:"height,omitempty"`
+	Time           int64    `protobuf:"varint,3,opt,name=time,proto3" json:"time,omitempty"`
+	NumTxs         int64    `protobuf:"varint,4,opt,name=num_txs,json=numTxs,proto3" json:"num_txs,omitempty"`
 	LastBlockId    *BlockID `protobuf:"bytes,5,opt,name=last_block_id,json=lastBlockId" json:"last_block_id,omitempty"`
 	LastCommitHash []byte   `protobuf:"bytes,6,opt,name=last_commit_hash,json=lastCommitHash,proto3" json:"last_commit_hash,omitempty"`
 	DataHash       []byte   `protobuf:"bytes,7,opt,name=data_hash,json=dataHash,proto3" json:"data_hash,omitempty"`
@@ -1408,21 +1408,21 @@ func (m *Header) GetChainId() string {
 	return ""
 }
 
-func (m *Header) GetHeight() uint64 {
+func (m *Header) GetHeight() int64 {
 	if m != nil {
 		return m.Height
 	}
 	return 0
 }
 
-func (m *Header) GetTime() uint64 {
+func (m *Header) GetTime() int64 {
 	if m != nil {
 		return m.Time
 	}
 	return 0
 }
 
-func (m *Header) GetNumTxs() uint64 {
+func (m *Header) GetNumTxs() int64 {
 	if m != nil {
 		return m.NumTxs
 	}
@@ -1489,7 +1489,7 @@ func (m *BlockID) GetParts() *PartSetHeader {
 }
 
 type PartSetHeader struct {
-	Total uint64 `protobuf:"varint,1,opt,name=total,proto3" json:"total,omitempty"`
+	Total int64  `protobuf:"varint,1,opt,name=total,proto3" json:"total,omitempty"`
 	Hash  []byte `protobuf:"bytes,2,opt,name=hash,proto3" json:"hash,omitempty"`
 }
 
@@ -1498,7 +1498,7 @@ func (m *PartSetHeader) String() string            { return proto.CompactTextStr
 func (*PartSetHeader) ProtoMessage()               {}
 func (*PartSetHeader) Descriptor() ([]byte, []int) { return fileDescriptorTypes, []int{27} }
 
-func (m *PartSetHeader) GetTotal() uint64 {
+func (m *PartSetHeader) GetTotal() int64 {
 	if m != nil {
 		return m.Total
 	}
@@ -1513,8 +1513,8 @@ func (m *PartSetHeader) GetHash() []byte {
 }
 
 type Validator struct {
-	PubKey []byte `protobuf:"bytes,1,opt,name=pubKey,proto3" json:"pubKey,omitempty"`
-	Power  uint64 `protobuf:"varint,2,opt,name=power,proto3" json:"power,omitempty"`
+	PubKey []byte `protobuf:"bytes,1,opt,name=pub_key,json=pubKey,proto3" json:"pub_key,omitempty"`
+	Power  int64  `protobuf:"varint,2,opt,name=power,proto3" json:"power,omitempty"`
 }
 
 func (m *Validator) Reset()                    { *m = Validator{} }
@@ -1529,7 +1529,7 @@ func (m *Validator) GetPubKey() []byte {
 	return nil
 }
 
-func (m *Validator) GetPower() uint64 {
+func (m *Validator) GetPower() int64 {
 	if m != nil {
 		return m.Power
 	}
@@ -2015,98 +2015,98 @@ var _ABCIApplication_serviceDesc = grpc.ServiceDesc{
 func init() { proto.RegisterFile("types/types.proto", fileDescriptorTypes) }
 
 var fileDescriptorTypes = []byte{
-	// 1485 bytes of a gzipped FileDescriptorProto
-	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0xbc, 0x58, 0xcd, 0x8e, 0x13, 0x47,
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+	0x92, 0x93, 0x6c, 0xf5, 0x35, 0xbf, 0xad, 0x7e, 0x39, 0xce, 0xff, 0x88, 0xc8, 0xf4, 0x5d, 0x60,
+	0x17, 0x19, 0x4a, 0xf6, 0x26, 0x69, 0xee, 0x61, 0xff, 0x87, 0x9a, 0x65, 0x4f, 0xa7, 0xc5, 0xd5,
+	0x59, 0xaa, 0xf5, 0x3f, 0xca, 0x50, 0x97, 0xb5, 0x95, 0x5d, 0x43, 0x9e, 0x37, 0x6d, 0x67, 0x64,
+	0x5b, 0x21, 0xbf, 0x90, 0x3c, 0xb4, 0x12, 0x97, 0x56, 0x4e, 0x5d, 0x1a, 0x83, 0xaa, 0xb0, 0x97,
+	0x5c, 0x51, 0x03, 0xad, 0xd9, 0x55, 0x68, 0x38, 0xab, 0xe5, 0x48, 0xac, 0xc3, 0xc4, 0xac, 0x3b,
+	0xab, 0xe5, 0xe9, 0x3a, 0x60, 0x87, 0xb0, 0x95, 0x20, 0x0a, 0xdb, 0x52, 0x05, 0x6c, 0x5b, 0xb9,
+	0x46, 0x7e, 0x0f, 0x4f, 0x8c, 0x76, 0x44, 0x19, 0x43, 0x8b, 0xed, 0x01, 0x31, 0xc8, 0x48, 0x16,
+	0x09, 0xc9, 0x2c, 0x75, 0x62, 0x96, 0x6d, 0xdc, 0x57, 0x55, 0x04, 0x1b, 0x87, 0xeb, 0xd0, 0xc2,
+	0x9b, 0x94, 0x26, 0x0d, 0x32, 0x69, 0xe2, 0x06, 0x29, 0xef, 0xc0, 0x4e, 0xdc, 0x8c, 0x48, 0x93,
+	0xa6, 0x3c, 0x25, 0xde, 0x26, 0xc3, 0x6b, 0xd0, 0x8c, 0x18, 0xac, 0x45, 0x16, 0x0d, 0x53, 0x11,
+	0xd7, 0x10, 0x1a, 0xca, 0xc5, 0xdc, 0xc6, 0xe5, 0x2e, 0xd4, 0x3c, 0xd3, 0x17, 0x81, 0x6a, 0x10,
+	0xc2, 0xfa, 0xf5, 0xda, 0xf4, 0xb1, 0x63, 0x54, 0xed, 0x8b, 0x34, 0xd1, 0x8f, 0x60, 0x2b, 0xb5,
+	0x8f, 0xcf, 0x4f, 0xb8, 0xc2, 0x5c, 0xa8, 0xd6, 0x45, 0x0a, 0xd1, 0xcf, 0x94, 0xe3, 0x9f, 0xd1,
+	0x9f, 0x40, 0x2b, 0xfa, 0x86, 0x78, 0xd5, 0xde, 0x6a, 0x3c, 0x0a, 0x9b, 0xd0, 0x4d, 0xa3, 0xee,
+	0xad, 0xc6, 0x2f, 0x65, 0x1f, 0xea, 0xb9, 0x1f, 0x54, 0x13, 0x55, 0x31, 0xa4, 0xa0, 0xff, 0x59,
+	0x82, 0xba, 0xe4, 0xaf, 0x9c, 0xd6, 0xf5, 0x5b, 0xea, 0xe9, 0x56, 0x7c, 0x84, 0x7e, 0x13, 0x6e,
+	0x3b, 0x1a, 0x97, 0x24, 0xe8, 0xe0, 0xf4, 0xdc, 0xe3, 0x46, 0x8b, 0xac, 0x70, 0xc9, 0x6e, 0xc1,
+	0xa6, 0x84, 0x04, 0xc2, 0xb7, 0x9d, 0x30, 0x7b, 0xdb, 0xb4, 0xf7, 0x86, 0xb6, 0xf0, 0xab, 0x48,
+	0x13, 0xdb, 0x11, 0x2a, 0x1d, 0x9a, 0xb4, 0x31, 0x74, 0x84, 0x7e, 0x1d, 0xaa, 0x74, 0x0e, 0x40,
+	0xfd, 0xcd, 0xa9, 0x31, 0x7c, 0xf5, 0x63, 0x67, 0x83, 0x35, 0xa0, 0x32, 0x7c, 0x75, 0xda, 0x29,
+	0x1d, 0x7e, 0xac, 0xc1, 0xce, 0x71, 0xff, 0xd9, 0xf0, 0xd8, 0xf3, 0x16, 0xf6, 0xc4, 0xa4, 0x32,
+	0xd1, 0x83, 0x2a, 0x15, 0xc2, 0x9c, 0xe9, 0xb0, 0x9b, 0xd7, 0x91, 0xb1, 0x43, 0xa8, 0x51, 0x3d,
+	0x64, 0x79, 0x43, 0x62, 0x37, 0xb7, 0x31, 0xc3, 0x1f, 0x91, 0x15, 0xf3, 0xe2, 0xac, 0xd8, 0xcd,
+	0xeb, 0xce, 0xd8, 0x0f, 0xd0, 0x8a, 0x2b, 0x59, 0xd1, 0xc4, 0xd8, 0x2d, 0xec, 0xd3, 0x10, 0x1f,
+	0x57, 0xb8, 0xa2, 0xb9, 0xb1, 0x5b, 0xd8, 0xac, 0xb1, 0xc7, 0xd0, 0x08, 0x8b, 0x4f, 0xfe, 0xf4,
+	0xd8, 0x2d, 0xe8, 0xd7, 0xf0, 0x7a, 0x64, 0x49, 0xc8, 0x1b, 0x0a, 0xbb, 0xb9, 0x2d, 0x18, 0x7b,
+	0x04, 0x75, 0xc5, 0x86, 0xb9, 0x83, 0x67, 0x37, 0xbf, 0xd1, 0xc3, 0x20, 0xe3, 0xf9, 0xa1, 0x68,
+	0xa2, 0xec, 0x16, 0xb6, 0x70, 0xec, 0x18, 0x20, 0x31, 0x39, 0x14, 0xce, 0x95, 0xdd, 0xe2, 0x46,
+	0x8e, 0x3d, 0x85, 0x66, 0x3c, 0x2c, 0xe4, 0x4f, 0x97, 0xdd, 0xa2, 0x5e, 0x6e, 0x5c, 0xa7, 0xff,
+	0x58, 0x3c, 0xfc, 0x2f, 0x00, 0x00, 0xff, 0xff, 0x34, 0x61, 0x21, 0x91, 0xfc, 0x10, 0x00, 0x00,
 }
diff --git a/types/types.proto b/types/types.proto
index 2754a3624..d40e8885f 100644
--- a/types/types.proto
+++ b/types/types.proto
@@ -52,7 +52,7 @@ message RequestCheckTx{
 message RequestQuery{
   bytes data = 1;
   string path = 2;
-  uint64 height = 3;
+  int64 height = 3;
   bool prove = 4;
 }
 
@@ -69,7 +69,7 @@ message RequestBeginBlock{
 }
 
 message RequestEndBlock{
-  uint64 height = 1;
+  int64 height = 1;
 }
 
 //----------------------------------------
@@ -107,7 +107,7 @@ message ResponseFlush{
 message ResponseInfo {
   string data = 1;
   string version = 2;
-  uint64 last_block_height = 3;
+  int64 last_block_height = 3;
   bytes last_block_app_hash = 4;
 }
 
@@ -126,8 +126,8 @@ message ResponseCheckTx{
   uint32            code        = 1;
   bytes             data        = 2 [(gogoproto.customtype) = "github.com/tendermint/go-wire/data.Bytes", (gogoproto.nullable) = false];
   string            log         = 3;
-  uint64            gas         = 4;
-  uint64            fee         = 5;
+  int64             gas         = 4;
+  int64             fee         = 5;
 }
 
 message ResponseQuery{
@@ -136,7 +136,7 @@ message ResponseQuery{
   bytes             key         = 3 [(gogoproto.customtype) = "github.com/tendermint/go-wire/data.Bytes", (gogoproto.nullable) = false];
   bytes             value       = 4 [(gogoproto.customtype) = "github.com/tendermint/go-wire/data.Bytes", (gogoproto.nullable) = false];
   bytes             proof       = 5 [(gogoproto.customtype) = "github.com/tendermint/go-wire/data.Bytes", (gogoproto.nullable) = false];
-  uint64            height      = 6;
+  int64             height      = 6;
   string            log         = 7;
 }
 
@@ -162,9 +162,9 @@ message ResponseEndBlock{
 
 message Header {
   string chain_id = 1;
-  uint64 height = 2;
-  uint64 time = 3;
-  uint64 num_txs = 4;
+  int64 height = 2;
+  int64 time = 3;
+  int64 num_txs = 4;
   BlockID last_block_id = 5;
   bytes last_commit_hash = 6;
   bytes data_hash = 7;
@@ -178,13 +178,13 @@ message BlockID {
 }
 
 message PartSetHeader {
-  uint64 total = 1;
+  int64 total = 1;
   bytes hash = 2;
 }
 
 message Validator {
-  bytes pubKey = 1;
-  uint64 power = 2;
+  bytes pub_key = 1;
+  int64 power = 2;
 }
 
 //----------------------------------------
diff --git a/types/validators.go b/types/validators.go
index 95258aa23..6bbe3f847 100644
--- a/types/validators.go
+++ b/types/validators.go
@@ -8,8 +8,7 @@ import (
 	cmn "github.com/tendermint/tmlibs/common"
 )
 
-// validators implements sort
-
+// Validators is a list of validators that implements the Sort interface
 type Validators []*Validator
 
 func (v Validators) Len() int {
@@ -31,7 +30,7 @@ func (v Validators) Swap(i, j int) {
 
 type validatorPretty struct {
 	PubKey data.Bytes `json:"pub_key"`
-	Power  uint64     `json:"power"`
+	Power  int64      `json:"power"`
 }
 
 func ValidatorsString(vs Validators) string {