bft blockchain consensus consistency cryptocurrency cryptography db distributed-systems go

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Changelog

v0.31.0

March 16th, 2019

Special thanks to external contributors on this release: @danil-lashin, @guagualvcha, @siburu, @silasdavis, @srmo, @Stumble, @svenstaro

This release is primarily about the new pubsub implementation, dubbed pubsub 2.0, and related changes, like configurable limits on the number of active RPC subscriptions at a time (max_subscription_clients). Pubsub 2.0 is an improved version of the older pubsub that is non-blocking and has a nicer API. Note the improved pubsub API also resulted in some improvements to the HTTPClient interface and the API for WebSocket subscriptions. This release also adds a configurable limit to the mempool size, max_txs_bytes, with default 1GB, and includes many smaller improvements and bug-fixes.

See the v0.31.0 Milestone for more details.

Friendly reminder, we have a bug bounty program.

BREAKING CHANGES:

CLI/RPC/Config
- [config] #2920 Remove consensus.blocktime_iota parameter
- [rpc] #3227 New PubSub design does not block on clients when publishing messages. Slow clients may miss messages and receive an error, terminating the subscription.
- [rpc] #3269 Limit number of unique clientIDs with open subscriptions. Configurable via rpc.max_subscription_clients
- [rpc] #3269 Limit number of unique queries a given client can subscribe to at once. Configurable via rpc.max_subscriptions_per_client.
- [rpc/client] #3269 Update EventsClient interface to reflect new pubsub/eventBus API ADR-33. This includes Subscribe, Unsubscribe, and UnsubscribeAll methods.
Apps
- [abci] #3403 Remove time_iota_ms from BlockParams. This is a ConsensusParam but need not be exposed to the app for now.
- [abci] #2920 Rename consensus_params.block_size to consensus_params.block in ABCI ConsensusParams
Go API
- [libs/common] TrapSignal accepts logger as a first parameter and does not block anymore
  - previously it was dumping "captured ..." msg to os.Stdout
  - TrapSignal should not be responsible for blocking thread of execution
- [libs/db] #3397 Add possibility to Close() Batch to prevent memory leak when using ClevelDB. (@Stumble)
- [types] #3354 Remove RoundState from EventDataRoundState
Blockchain Protocol
P2P Protocol

FEATURES:

[config] #3269 New configuration values for controlling RPC subscriptions:
- rpc.max_subscription_clients sets the maximum number of unique clients with open subscriptions
- rpc.max_subscriptions_per_clientsets the maximum number of unique subscriptions from a given client
- rpc.timeout_broadcast_tx_commit sets the time to wait for a tx to be committed during /broadcast_tx_commit
[types] #2920 Add time_iota_ms to block's consensus parameters (not exposed to the application)
[lite] #3269 Add /unsubscribe_all endpoint to unsubscribe from all events
[mempool] #3079 Bound mempool memory usage via the mempool.max_txs_bytes configuration value. Set to 1GB by default. The mempool's current txs_total_bytes is exposed via total_bytes field in /num_unconfirmed_txs and /unconfirmed_txs RPC endpoints.

IMPROVEMENTS:

[all] #3385, #3386 Various linting improvements
[crypto] #3371 Copy in secp256k1 package from go-ethereum instead of importing go-ethereum (@silasdavis)
[deps] #3382 Don't pin repos without releases
[deps] #3357, #3389, #3392 Update gogo/protobuf, golang/protobuf, levigo, golang.org/x/crypto
[libs/common] #3238 exit with zero (0) code upon receiving SIGTERM/SIGINT
[libs/db] #3378 CLevelDB#Stats now returns the following properties:
- leveldb.num-files-at-level{n}
- leveldb.stats
- leveldb.sstables
- leveldb.blockpool
- leveldb.cachedblock
- leveldb.openedtables
- leveldb.alivesnaps
- leveldb.aliveiters
[privval] #3351 First part of larger refactoring that clarifies and separates concerns in the privval package.

BUG FIXES:

[blockchain] #3358 Fix timer leak in BlockPool (@guagualvcha)
[cmd] #3408 Fix testnet command's panic when creating non-validator configs (using --n flag) (@srmo)
[libs/db/remotedb/grpcdb] #3402 Close Iterator/ReverseIterator after use
[libs/pubsub] #951, #1880 Use non-blocking send when dispatching messages ADR-33
[lite] #3364 Fix /validators and /abci_query proxy endpoints (@guagualvcha)
[p2p/conn] #3347 Reject all-zero shared secrets in the Diffie-Hellman step of secret-connection
[p2p] #3369 Do not panic when filter times out
[p2p] #3359 Fix reconnecting report duplicate ID error due to race condition between adding peer to peerSet and starting it (@guagualvcha)
[test] #3421 Fix logfile names created by localnet via docker-compose.yml

v0.30.2

March 10th, 2019

This release fixes a CLevelDB memory leak. It was happening because we were not closing the WriteBatch object after use. See levigo's godoc for the Close method. Special thanks goes to @Stumble who both reported an issue in cosmos-sdk and provided a fix here.

BREAKING CHANGES:

Go API
- [libs/db] #3842 Add Close() method to Batch interface (@Stumble)

BUG FIXES:

[libs/db] #3842 Fix CLevelDB memory leak (@Stumble)

v0.30.1

February 20th, 2019

This release fixes a consensus halt and a DataCorruptionError after restart discovered in game_of_stakes_6. It also fixes a security issue in the p2p handshake by authenticating the NetAddress.ID of the peer we're dialing.

IMPROVEMENTS:

[config] #3291 Make config.ResetTestRootWithChainID() create concurrency-safe test directories.

BUG FIXES:

[consensus] #3295 Flush WAL on stop to prevent data corruption during graceful shutdown.
[consensus] #3302 Fix possible halt by resetting TriggeredTimeoutPrecommit before starting next height.
[rpc] #3251 Fix /net_info#peers#remote_ip format. New format spec:
- dotted decimal ("192.0.2.1"), if ip is an IPv4 or IP4-mapped IPv6 address
- IPv6 ("2001:db8::1"), if ip is a valid IPv6 address
[cmd] #3314 Return an error on show_validator when the private validator file does not exist.
[p2p] #3010 Authenticate a peer against its NetAddress.ID when dialing.

v0.30.0

February 8th, 2019

This release fixes yet another issue with the proposer selection algorithm. We hope it's the last one, but we won't be surprised if it's not. We plan to one day expose the selection algorithm more directly to the application (#3285), and even to support randomness (#763). For more, see issues marked proposer-selection.

This release also includes a fix to prevent Tendermint from including the same piece of evidence in more than one block. This issue was reported by @chengwenxi in our bug bounty program.

BREAKING CHANGES:

Apps
- [state] #3222 Duplicate updates for the same validator are forbidden. Apps must ensure that a given ResponseEndBlock.ValidatorUpdates contains only one entry per pubkey.
Go API
- [types] #3222 Remove Add and Update methods from ValidatorSet in favor of new UpdateWithChangeSet. This allows updates to be applied as a set, instead of one at a time.
Block Protocol
- [state] #3286 Blocks that include already committed evidence are invalid.
P2P Protocol
- [consensus] #3222 Validator updates are applied as a set, instead of one at a time, thus impacting the proposer priority calculation. This ensures that the proposer selection algorithm does not depend on the order of updates in ResponseEndBlock.ValidatorUpdates.

IMPROVEMENTS:

[crypto] #3279 Use btcec.S256().N directly instead of hard coding a copy.

BUG FIXES:

[state] #3222 Fix validator set updates so they are applied as a set, rather than one at a time. This makes the proposer selection algorithm independent of the order of updates in ResponseEndBlock.ValidatorUpdates.
[evidence] #3286 Don't add committed evidence to evidence pool.

v0.29.2

February 7th, 2019

Special thanks to external contributors on this release: @ackratos, @rickyyangz

Note: This release contains security sensitive patches in the p2p and crypto packages:

p2p:
- Partial fix for MITM attacks on the p2p connection. MITM conditions may still exist. See #3010.
crypto:
- Eliminate our fork of btcd and use the btcd/btcec library directly for native secp256k1 signing. Note we still modify the signature encoding to prevent malleability.
- Support the libsecp256k1 library via CGo through the go-ethereum/crypto/secp256k1 package.
- Eliminate MixEntropy functions

BREAKING CHANGES:

Go API
- [crypto] #3278 Remove MixEntropy functions
- [types] #3245 Commit uses type CommitSig Vote instead of Vote directly. In preparation for removing redundant fields from the commit #1648

IMPROVEMENTS:

[consensus] #3246 Better logging and notes on recovery for corrupted WAL file
[crypto] #3163 Use ethereum's libsecp256k1 go-wrapper for signatures when cgo is available
[crypto] #3162 Wrap btcd instead of forking it to keep up with fixes (used if cgo is not available)
[makefile] #3233 Use golangci-lint instead of go-metalinter
[tools] #3218 Add go-deadlock tool to help detect deadlocks
[tools] #3106 Add tm-signer-harness test harness for remote signers
[tests] #3258 Fixed a bunch of non-deterministic test failures

BUG FIXES:

[node] #3186 EventBus and indexerService should be started before first block (for replay last block on handshake) execution (@ackratos)
[p2p] #3232 Fix infinite loop leading to addrbook deadlock for seed nodes
[p2p] #3247 Fix panic in SeedMode when calling FlushStop and OnStop concurrently
[p2p] #3040 Fix MITM on secret connection by checking low-order points
[privval] #3258 Fix race between sign requests and ping requests in socket that was causing messages to be corrupted

v0.29.1

January 24, 2019

Special thanks to external contributors on this release: @infinytum, @gauthamzz

This release contains two important fixes: one for p2p layer where we sometimes were not closing connections and one for consensus layer where consensus with no empty blocks (create_empty_blocks = false) could halt.

Friendly reminder, we have a bug bounty program.

IMPROVEMENTS:

[pex] #3037 Only log "Reached max attempts to dial" once
[rpc] #3159 Expose triggered_timeout_commit in the /dump_consensus_state

BUG FIXES:

[consensus] #3199 Fix consensus halt with no empty blocks from not resetting triggeredTimeoutCommit
[p2p] #2967 Fix file descriptor leak

v0.29.0

January 21, 2019

Special thanks to external contributors on this release: @bradyjoestar, @kunaldhariwal, @gauthamzz, @hrharder

This release is primarily about making some breaking changes to the Block protocol version before Cosmos launch, and to fixing more issues in the proposer selection algorithm discovered on Cosmos testnets.

The Block protocol changes include using a standard Merkle tree format (RFC 6962), fixing some inconsistencies between field orders in Vote and Proposal structs, and constraining the hash of the ConsensusParams to include only a few fields.

The proposer selection algorithm saw significant progress, including a formal proof by @cwgoes for the base-case in Idris and a much more detailed specification (still in progress) by @ancazamfir.

Fixes to the proposer selection algorithm include normalizing the proposer priorities to mitigate the effects of large changes to the validator set. That said, we just discovered another bug, which will be fixed in the next breaking release.

While we are trying to stabilize the Block protocol to preserve compatibility with old chains, there may be some final changes yet to come before Cosmos launch as we continue to audit and test the software.

Friendly reminder, we have a bug bounty program.

BREAKING CHANGES:

CLI/RPC/Config
Apps
- [state] #3049 Total voting power of the validator set is upper bounded by MaxInt64 / 8. Apps must ensure they do not return changes to the validator set that cause this maximum to be exceeded.
Go API
- [node] #3082 MetricsProvider now requires you to pass a chain ID
- [types] #2713 Rename TxProof.LeafHash to TxProof.Leaf
- [crypto/merkle] #2713 SimpleProof.Verify takes a leaf instead of a leafHash and performs the hashing itself
Blockchain Protocol
- [crypto/merkle] #2713 Merkle trees now match the RFC 6962 specification
- [types] #3078 Re-order Timestamp and BlockID in CanonicalVote so it's consistent with CanonicalProposal (BlockID comes first)
- [types] #3165 Hash of ConsensusParams only includes BlockSize.MaxBytes and BlockSize.MaxGas
P2P Protocol
- [consensus] #3049 Normalize priorities to not exceed 2*TotalVotingPower to mitigate unfair proposer selection heavily preferring earlier joined validators in the case of an early bonded large validator unbonding

FEATURES:

IMPROVEMENTS:

[rpc] #3065 Return maxPerPage (100), not defaultPerPage (30) if per_page is greater than the max 100.
[instrumentation] #3082 Add chain_id label for all metrics

BUG FIXES:

[crypto] #3164 Update btcd fork for rare signRFC6979 bug
[lite] #3171 Fix verifying large validator set changes
[log] #3125 Fix year format
[mempool] #3168 Limit tx size to fit in the max reactor msg size
[scripts] #3147 Fix json2wal for large block parts (@bradyjoestar)

v0.28.1

January 18th, 2019

Special thanks to external contributors on this release: @HaoyangLiu

Friendly reminder, we have a bug bounty program.

BUG FIXES:

[consensus] Fix consensus halt from proposing blocks with too much evidence

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 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 allow_duplicate_ip is now set to false
- [privval] #1181 Split priv_validator.json into immutable (config/priv_validator_key.json) and mutable (data/priv_validator_state.json) parts (@yutianwu)
- [privval] #2926 Split up PubKeyMsg into PubKeyRequest and PubKeyResponse to be consistent with other message types
- [privval] #2923 Listen for unix socket connections instead of dialing them
Apps
Go API
- [types] #2981 Remove PrivValidator.GetAddress()
Blockchain Protocol
P2P Protocol

FEATURES:

[rpc] #3052 Include peer's remote IP in /net_info

IMPROVEMENTS:

[consensus] #3086 Log peerID on ignored votes (@srmo)
[docs] #3061 Added specification for signing consensus msgs at ./docs/spec/consensus/signing.md
[privval] #2948 Memoize pubkey so it's only requested once on startup
[privval] #2923 Retry RemoteSigner connections on error

BUG FIXES:

[build] #3085 Fix Version field in build scripts (@husio)
[crypto/multisig] #3102 Fix multisig keys address length
[crypto/encoding] #3101 Fix PubKeyMultisigThreshold unmarshalling into crypto.PubKey interface
[p2p/conn] #3111 Make SecretConnection thread safe
[rpc] #3053 Fix internal error in /tx_search when results are empty (@gianfelipe93)
[types] #2926 Do not panic if retrieving the privval's public key fails

v0.27.4

December 21st, 2018

BUG FIXES:

[mempool] #3036 Fix LRU cache by popping the least recently used item when the cache is full, not the most recently used one!

v0.27.3

December 16th, 2018

BREAKING CHANGES:

Go API
- [dep] #3027 Revert to mainline Go crypto library, eliminating the modified bcrypt.GenerateFromPassword

v0.27.2

December 16th, 2018

IMPROVEMENTS:

[node] #3025 Validate NodeInfo addresses on startup.

BUG FIXES:

[p2p] #3025 Revert to using defers in addrbook. Fixes deadlocks in pex and consensus upon invalid ExternalAddr/ListenAddr configuration.

v0.27.1

December 15th, 2018

Special thanks to external contributors on this release: @danil-lashin, @hleb-albau, @james-ray, @leo-xinwang

FEATURES:

[rpc] #2964 Add UnconfirmedTxs(limit) and NumUnconfirmedTxs() methods to HTTP/Local clients (@danil-lashin)
[docs] #3004 Enable full-text search on docs pages

IMPROVEMENTS:

[consensus] #2971 Return error if ValidatorSet is empty after InitChain (@leo-xinwang)
[ci/cd] #3005 Updated CircleCI job to trigger website build when docs are updated
[docs] Various updates

BUG FIXES:

[cmd] #2983 testnet command always sets addr_book_strict = false
[config] #2980 Fix CORS options formatting
[kv indexer] #2912 Don't ignore key when executing CONTAINS
[mempool] #2961 Call notifyTxsAvailable if there're txs left after committing a block, but recheck=false
[mempool] #2994 Reject txs with negative GasWanted
[p2p] #2990 Fix a bug where seeds don't disconnect from a peer after 3h
[consensus] #3006 Save state after InitChain only when stateHeight is also 0 (@james-ray)

v0.27.0

December 5th, 2018

Special thanks to external contributors on this release: @danil-lashin, @srmo

Special thanks to @dlguddus for discovering a major issue in the proposer selection algorithm.

Friendly reminder, we have a bug bounty program.

This release is primarily about fixes to the proposer selection algorithm in preparation for the Cosmos Game of Stakes. It also makes use of the ConsensusParams.Validator.PubKeyTypes to restrict the key types that can be used by validators, and removes the Heartbeat consensus message.

BREAKING CHANGES:

CLI/RPC/Config
- [rpc] #2932 Rename accum to proposer_priority
Go API
- [db] #2913 ReverseIterator API change: start < end, and end is exclusive.
- [types] #2932 Rename Validator.Accum to Validator.ProposerPriority
Blockchain Protocol
- [state] #2714 Validators can now only use pubkeys allowed within ConsensusParams.Validator.PubKeyTypes
P2P Protocol
- [consensus] #2871 Remove ProposalHeartbeat message as it serves no real purpose (@srmo)
- [state] Fixes for proposer selection:
  - #2785 Accum for new validators is -1.125*totalVotingPower instead of 0
  - #2941 val.Accum is preserved during ValidatorSet.Update to avoid being reset to 0

IMPROVEMENTS:

[state] #2929 Minor refactor of updateState logic (@danil-lashin)
[node] #2959 Allow node to start even if software's BlockProtocol is different from state's BlockProtocol
[pex] #2959 Pex reactor logger uses module=pex

BUG FIXES:

[p2p] #2968 Panic on transport error rather than continuing to run but not accept new connections
[p2p] #2969 Fix mismatch in peer count between /net_info and the prometheus metrics
[rpc] #2408 /broadcast_tx_commit: Fix "interface conversion: interface {} in nil, not EventDataTx" panic (could happen if somebody sent a tx using /broadcast_tx_commit while Tendermint was being stopped)
[state] #2785 Fix accum for new validators to be -1.125*totalVotingPower instead of 0, forcing them to wait before becoming the proposer. Also:
- do not batch clip
- keep accums averaged near 0
[txindex/kv] #2925 Don't return false positives when range searching for a prefix of a tag value
[types] #2938 Fix regression in v0.26.4 where we panic on empty genDoc.Validators
[types] #2941 Preserve val.Accum during ValidatorSet.Update to avoid it being reset to 0 every time a validator is updated

v0.26.4

November 27th, 2018

Special thanks to external contributors on this release: @ackratos, @goolAdapter, @james-ray, @joe-bowman, @kostko, @nagarajmanjunath, @tomtau

Friendly reminder, we have a bug bounty program.

FEATURES:

[rpc] #2747 Enable subscription to tags emitted from BeginBlock/EndBlock (@kostko)
[types] #2747 Add ResultBeginBlock and ResultEndBlock fields to EventDataNewBlock and EventDataNewBlockHeader to support subscriptions (@kostko)
[types] #2918 Add Marshal, MarshalTo, Unmarshal methods to various structs to support Protobuf compatibility (@nagarajmanjunath)

IMPROVEMENTS:

[config] #2877 Add blocktime_iota to the config.toml (@ackratos)
- NOTE: this should be a ConsensusParam, not part of the config, and will be removed from the config at a later date (#2920.
[mempool] #2882 Add txs from Update to cache
[mempool] #2891 Remove local int64 counter from being stored in every tx
[node] #2866 Add ability to instantiate IPCVal (@joe-bowman)

BUG FIXES:

[blockchain] #2731 Retry both blocks if either is bad to avoid getting stuck during fast sync (@goolAdapter)
[consensus] #2893 Use genDoc.Validators instead of state.NextValidators on replay when appHeight==0 (@james-ray)
[log] #2868 Fix module=main setting overriding all others
- NOTE: this changes the default logging behaviour to be much less verbose. Set log_level="info" to restore the previous behaviour.
[rpc] #2808 Fix accum field in /validators by calling IncrementAccum if necessary
[rpc] #2811 Allow integer IDs in JSON-RPC requests (@tomtau)
[txindex/kv] #2759 Fix tx.height range queries
[txindex/kv] #2775 Order tx results by index if height is the same
[txindex/kv] #2908 Don't return false positives when searching for a prefix of a tag value

v0.26.3

November 17th, 2018

Special thanks to external contributors on this release: @danil-lashin, @kevlubkcm, @krhubert, @srmo

Friendly reminder, we have a bug bounty program.

BREAKING CHANGES:

Go API
- [rpc] #2791 Functions that start HTTP servers are now blocking:
  - Impacts StartHTTPServer, StartHTTPAndTLSServer, and StartGRPCServer
  - These functions now take a net.Listener instead of an address
- [rpc] #2767 Subscribing to events NewRound and CompleteProposal return new types EventDataNewRound and EventDataCompleteProposal, respectively, instead of the generic EventDataRoundState. (@kevlubkcm)

FEATURES:

[log] #2843 New log_format config option, which can be set to 'plain' for colored text or 'json' for JSON output
[types] #2767 New event types EventDataNewRound (with ProposerInfo) and EventDataCompleteProposal (with BlockID). (@kevlubkcm)

IMPROVEMENTS:

[dep] #2844 Dependencies are no longer pinned to an exact version in the Gopkg.toml:
- Serialization libs are allowed to vary by patch release
- Other libs are allowed to vary by minor release
[p2p] #2857 "Send failed" is logged at debug level instead of error.
[rpc] #2780 Add read and write timeouts to HTTP servers
[state] #2848 Make "Update to validators" msg value pretty (@danil-lashin)

BUG FIXES:

[consensus] #2819 Don't send proposalHearbeat if not a validator
[docs] #2859 Fix ConsensusParams details in spec
[libs/autofile] #2760 Comment out autofile permissions check - should fix running Tendermint on Windows
[p2p] #2869 Set connection config properly instead of always using default
[p2p/pex] #2802 Seed mode fixes:
- Only disconnect from inbound peers
- Use FlushStop instead of Sleep to ensure all messages are sent before disconnecting

v0.26.2

November 15th, 2018

Special thanks to external contributors on this release: @hleb-albau, @zhuzeyu

Friendly reminder, we have a bug bounty program.

FEATURES:

[rpc] #2582 Enable CORS on RPC API (@hleb-albau)

BUG FIXES:

[abci] #2748 Unlock mutex in localClient so even when app panics (e.g. during CheckTx), consensus continue working
[abci] #2748 Fix DATA RACE in localClient
[amino] #2822 Update to v0.14.1 to support compiling on 32-bit platforms
[rpc] #2748 Drain channel before calling Unsubscribe(All) in /broadcast_tx_commit

v0.26.1

November 11, 2018

Special thanks to external contributors on this release: @katakonst

Friendly reminder, we have a bug bounty program.

IMPROVEMENTS:

[consensus] #2704 Simplify valid POL round logic
[docs] #2749 Deduplicate some ABCI docs
[mempool] More detailed log messages
- #2724
- #2762

BUG FIXES:

[autofile] #2703 Do not panic when checking Head size
[crypto/merkle] #2756 Fix crypto/merkle ProofOperators.Verify to check bounds on keypath parts.
[mempool] fix a bug where we create a WAL despite wal_dir being empty
[p2p] #2771 Fix peer-id label name to peer_id in prometheus metrics
[p2p] #2797 Fix IDs in peer NodeInfo and require them for addresses in AddressBook
[p2p] #2797 Do not close conn immediately after sending pex addrs in seed mode. Partial fix for #2092.

v0.26.0

November 2, 2018

Special thanks to external contributors on this release: @bradyjoestar, @connorwstein, @goolAdapter, @HaoyangLiu, @james-ray, @overbool, @phymbert, @Slamper, @Uzair1995, @yutianwu.

Special thanks to @Slamper for a series of bug reports in our bug bounty program which are fixed in this release.

This release is primarily about adding Version fields to various data structures, optimizing consensus messages for signing and verification in restricted environments (like HSMs and the Ethereum Virtual Machine), and aligning the consensus code with the specification. It also includes our first take at a generalized merkle proof system, and changes the length of hashes used for hashing data structures from 20 to 32 bytes.

See the UPGRADING.md for details on upgrading to the new version.

Please note that we are still making breaking changes to the protocols. While the new Version fields should help us to keep the software backwards compatible even while upgrading the protocols, we cannot guarantee that new releases will be compatible with old chains just yet. We expect there will be another breaking release or two before the Cosmos Hub launch, but we will otherwise be paying increasing attention to backwards compatibility. Thanks for bearing with us!

BREAKING CHANGES:

CLI/RPC/Config
- [config] #2232 Timeouts are now strings like "3s" and "100ms", not ints
- [config] #2505 Remove Mempool.RecheckEmpty (it was effectively useless anyways)
- [config] #2490 mempool.wal is disabled by default
- [privval] #2459 Split SocketPVMsgs implementations into Request and Response, where the Response may contain a error message (returned by the remote signer)
- [state] #2644 Add Version field to State, breaking the format of State as encoded on disk.
- [rpc] #2298 /abci_query takes prove argument instead of trusted and switches the default behaviour to prove=false
- [rpc] #2654 Remove all node_info.other.*_version fields in /status and /net_info
- [rpc] #2636 Remove _params suffix from fields in consensus_params.
Apps
- [abci] #2298 ResponseQuery.Proof is now a structured merkle.Proof, not just arbitrary bytes
- [abci] #2644 Add Version to Header and shift all fields by one
- [abci] #2662 Bump the field numbers for some ResponseInfo fields to make room for AppVersion
- [abci] #2636 Updates to ConsensusParams
  - Remove Params suffix from field names
  - Add Params suffix to message types
  - Add new field and type, Validator ValidatorParams, to control what types of validator keys are allowed.
Go API
- [config] #2232 Timeouts are time.Duration, not ints
- [crypto/merkle & lite] #2298 Various changes to accomodate General Merkle trees
- [crypto/merkle] #2595 Remove all Hasher objects in favor of byte slices
- [crypto/merkle] #2635 merkle.SimpleHashFromTwoHashes is no longer exported
- [node] #2479 Remove node.RunForever
- [rpc/client] #2298 ABCIQueryOptions.Trusted -> ABCIQueryOptions.Prove
- [types] #2298 Remove Index and Total fields from TxProof.
- [types] #2598 VoteTypeXxx are now of type SignedMsgType byte and named XxxType, eg. PrevoteType, PrecommitType.
- [types] #2636 Rename fields in ConsensusParams to remove Params suffixes
- [types] #2735 Simplify Proposal message to align with spec
Blockchain Protocol
- [crypto/tmhash] #2732 TMHASH is now full 32-byte SHA256
  - All hashes in the block header and Merkle trees are now 32-bytes
  - PubKey Addresses are still only 20-bytes
- [state] #2587 Require block.Time of the fist block to be genesis time
- [state] #2644 Require block.Version to match state.Version
- [types] Update SignBytes for Vote/Proposal/Heartbeat:
  - #2459 Use amino encoding instead of JSON in SignBytes.
  - #2598 Reorder fields and use fixed sized encoding.
  - #2598 Change Type field from string to byte and use new SignedMsgType to enumerate.
- [types] #2730 Use same order for fields in Vote as in the SignBytes
- [types] #2732 Remove the address field from the validator hash
- [types] #2644 Add Version struct to Header
- [types] #2609 ConsensusParams.Hash() is the hash of the amino encoded struct instead of the Merkle tree of the fields
- [types] #2670 Header.Hash() builds Merkle tree out of fields in the same order they appear in the header, instead of sorting by field name
- [types] #2682 Use proto3 varint encoding for ints that are usually unsigned (instead of zigzag encoding).
- [types] #2636 Add Validator field to ConsensusParams (Used to control which pubkey types validators can use, by abci type).
P2P Protocol
- [consensus] #2652 Replace CommitStepMessage with NewValidBlockMessage
- [consensus] #2735 Simplify Proposal message to align with spec
- [consensus] #2730 Add Type field to Proposal and use same order of fields as in the SignBytes for both Proposal and Vote
- [p2p] #2654 Add ProtocolVersion struct with protocol versions to top of DefaultNodeInfo and require ProtocolVersion.Block to match during peer handshake

FEATURES:

[abci] #2557 Add Codespace field to Response{CheckTx, DeliverTx, Query}
[abci] #2662 Add BlockVersion and P2PVersion to RequestInfo
[crypto/merkle] #2298 General Merkle Proof scheme for chaining various types of Merkle trees together
[docs/architecture] #1181 S plit immutable and mutable parts of priv_validator.json

IMPROVEMENTS:

Additional Metrics
- [consensus] #2169
- [p2p] #2169
[config] #2232 Added ValidateBasic method, which performs basic checks
[crypto/ed25519] #2558 Switch to use latest golang.org/x/crypto through our fork at github.com/tendermint/crypto
[libs/log] #2707 Add year to log format (@yutianwu)
[tools] #2238 Binary dependencies are now locked to a specific git commit

BUG FIXES:

#2711 Validate all incoming reactor messages. Fixes various bugs due to negative ints.
[autofile] #2428 Group.RotateFile need call Flush() before rename (@goolAdapter)
[common] #2533 Fixed a bug in the BitArray.Or method
[common] #2506 Fixed a bug in the BitArray.Sub method (@james-ray)
[common] #2534 Fix BitArray.PickRandom to choose uniformly from true bits
[consensus] #1690 Wait for timeoutPrecommit before starting next round
[consensus] #1745 Wait for Proposal or timeoutProposal before entering prevote
[consensus] #2642 Only propose ValidBlock, not LockedBlock
[consensus] #2642 Initialized ValidRound and LockedRound to -1
[consensus] #1637 Limit the amount of evidence that can be included in a block
[consensus] #2652 Ensure valid block property with faulty proposer
[evidence] #2515 Fix db iter leak (@goolAdapter)
[libs/event] #2518 Fix event concurrency flaw (@goolAdapter)
[node] #2434 Make node respond to signal interrupts while sleeping for genesis time
[state] #2616 Pass nil to NewValidatorSet() when genesis file's Validators field is nil
[p2p] #2555 Fix p2p switch FlushThrottle value (@goolAdapter)
[p2p] #2668 Reconnect to originally dialed address (not self-reported address) for persistent peers

v0.25.0

September 22, 2018

Special thanks to external contributors on this release: @scriptionist, @bradyjoestar, @WALL-E

This release is mostly about the ConsensusParams - removing fields and enforcing MaxGas. It also addresses some issues found via security audit, removes various unused functions from libs/common, and implements ADR-012.

Friendly reminder, we have a bug bounty program.

BREAKING CHANGES:

CLI/RPC/Config
- [rpc] #2391 /status result.node_info.other became a map
- [types] #2364 Remove TxSize and BlockGossip from ConsensusParams
  - Maximum tx size is now set implicitly via the BlockSize.MaxBytes
  - The size of block parts in the consensus is now fixed to 64kB
Apps
- [mempool] #2360 Mempool tracks the ResponseCheckTx.GasWanted and ConsensusParams.BlockSize.MaxGas and enforces:
  - GasWanted <= MaxGas for every tx
  - (sum of GasWanted in block) <= MaxGas for block proposal
Go API
- [libs/common] #2431 Remove Word256 due to lack of use
- [libs/common] #2452 Remove the following functions due to lack of use:
  - byteslice.go: cmn.IsZeros, cmn.RightPadBytes, cmn.LeftPadBytes, cmn.PrefixEndBytes
  - strings.go: cmn.IsHex, cmn.StripHex
  - int.go: Uint64Slice, all put/get int64 methods

FEATURES:

[rpc] #2415 New /consensus_params?height=X endpoint to query the consensus params at any height (@scriptonist)
[types] #1714 Add Address to GenesisValidator
[metrics] #2337 consensus.block_interval_metrics is now gauge, not histogram (you will be able to see spikes, if any)
[libs] #2286 Panic if autofile or db/fsdb permissions change from 0600.

IMPROVEMENTS:

[libs/db] #2371 Output error instead of panic when the given db_backend is not initialised (@bradyjoestar)
[mempool] #2399 Make mempool cache a proper LRU (@bradyjoestar)
[p2p] #2126 Introduce PeerTransport interface to improve isolation of concerns
[libs/common] #2326 Service returns ErrNotStarted

BUG FIXES:

[node] #2294 Delay starting node until Genesis time
[consensus] #2048 Correct peer statistics for marking peer as good
[rpc] #2460 StartHTTPAndTLSServer() now passes StartTLS() errors back to the caller rather than hanging forever.
[p2p] #2047 Accept new connections asynchronously
[tm-bench] #2410 Enforce minimum transaction size (@WALL-E)

0.24.0

September 6th, 2018

Special thanks to external contributors with PRs included in this release: ackratos, james-ray, bradyjoestar, peerlink, Ahmah2009, bluele, b00f.

This release includes breaking upgrades in the block header, including the long awaited changes for delaying validator set updates by one block to better support light clients. It also fixes enforcement on the maximum size of blocks, and includes a BFT timestamp in each block that can be safely used by applications. There are also some minor breaking changes to the rpc, config, and ABCI.

See the UPGRADING.md for details on upgrading to the new version.

From here on, breaking changes will be broken down to better reflect how users are affected by a change.

A few more breaking changes are in the works - each will come with a clear Architecture Decision Record (ADR) explaining the change. You can review ADRs here or in the open Pull Requests. You can also check in on the issues marked as breaking.

BREAKING CHANGES:

CLI/RPC/Config
- [config] #2169 Replace MaxNumPeers with MaxNumInboundPeers and MaxNumOutboundPeers
- [config] #2300 Reduce default mempool size from 100k to 5k, until ABCI rechecking is implemented.
- [rpc] #1815 /commit returns a signed_header field instead of everything being top-level
Apps
- [abci] Added address of the original proposer of the block to Header
- [abci] Change ABCI Header to match Tendermint exactly
- [abci] #2159 Update use of Validator (see ADR-018):
  - Remove PubKey from Validator (so it's just Address and Power)
  - Introduce ValidatorUpdate (with just PubKey and Power)
  - InitChain and EndBlock use ValidatorUpdate
  - Update field names and types in BeginBlock
- [state] #1815 Validator set changes are now delayed by one block
  - updates returned in ResponseEndBlock for block H will be included in RequestBeginBlock for block H+2
Go API
- [lite] #1815 Complete refactor of the package
- [node] #2212 NewNode now accepts a *p2p.NodeKey (@bradyjoestar)
- [libs/common] #2199 Remove Fmt, in favor of fmt.Sprintf
- [libs/common] SplitAndTrim was deleted
- [libs/common] #2274 Remove unused Math functions like MaxInt, MaxInt64, MinInt, MinInt64 (@Ahmah2009)
- [libs/clist] Panics if list extends beyond MaxLength
- [crypto] #2205 Rename AminoRoute variables to no longer be prefixed by signature type.
Blockchain Protocol
- [state] #1815 Validator set changes are now delayed by one block (!)
  - Add NextValidatorSet to State, changes on-disk representation of state
- [state] #2184 Enforce ConsensusParams.BlockSize.MaxBytes (See ADR-020).
  - Remove ConsensusParams.BlockSize.MaxTxs
  - Introduce maximum sizes for all components of a block, including ChainID
- [types] Updates to the block Header:
  - #1815 NextValidatorsHash - hash of the validator set for the next block, so the current validators actually sign over the hash for the new validators
  - #2106 ProposerAddress - address of the block's original proposer
- [consensus] #2203 Implement BFT time
  - Timestamp in block must be monotonic and equal the median of timestamps in block's LastCommit
- [crypto] #2239 Secp256k1 signature changes (See ADR-014):
  - format changed from DER to r || s, both little endian encoded as 32 bytes.
  - malleability removed by requiring s to be in canonical form.
P2P Protocol
- [p2p] #2263 Update secret connection to use a little endian encoded nonce
- [blockchain] #2213 Fix Amino routes for blockchain reactor messages (@peerlink)

FEATURES:

[types] #2015 Allow genesis file to have 0 validators (@b00f)
- Initial validator set can be determined by the app in ResponseInitChain
[rpc] #2161 New event ValidatorSetUpdates for when the validator set changes
[crypto/multisig] #2164 Introduce multisig pubkey and signature format
[libs/db] #2293 Allow passing options through when creating instances of leveldb dbs

IMPROVEMENTS:

[docs] Lint documentation with write-good and stop-words.
[docs] #2249 Refactor, deduplicate, and improve the ABCI docs and spec (with thanks to @ttmc).
[scripts] #2196 Added json2wal tool, which is supposed to help our users restore (@bradyjoestar) corrupted WAL files and compose test WAL files (@bradyjoestar)
[mempool] #2234 Now stores txs by hash inside of the cache, to mitigate memory leakage
[mempool] #2166 Set explicit capacity for map when updating txs (@bluele)

BUG FIXES:

[config] #2284 Replace db_path with db_dir from automatically generated configuration files.
[mempool] #2188 Fix OOM issue from cache map and list getting out of sync
[state] #2051 KV store index supports searching by tx.height (@ackratos)
[rpc] #2327 /dial_peers does not try to dial existing peers
[node] #2323 Filter empty strings from config lists (@james-ray)
[abci/client] #2236 Fix closing GRPC connection (@bradyjoestar)

0.23.1

August 22nd, 2018

BUG FIXES:

[libs/autofile] #2261 Fix log rotation so it actually happens.
- Fixes issues with consensus WAL growing unbounded ala #2259

0.23.0

August 5th, 2018

This release includes breaking upgrades in our P2P encryption, some ABCI messages, and how we encode time and signatures.

A few more changes are still coming to the Header, ABCI, and validator set handling to better support light clients, BFT time, and upgrades. Most notably, validator set changes will be delayed by one block (see #1815).

We also removed make ensure_deps in favour of make get_vendor_deps.

BREAKING CHANGES:

[abci] Changed time format from int64 to google.protobuf.Timestamp
[abci] Changed Validators to LastCommitInfo in RequestBeginBlock
[abci] Removed Fee from ResponseDeliverTx and ResponseCheckTx
[crypto] Switch crypto.Signature from interface to []byte for space efficiency #2128
- NOTE: this means signatures no longer have the prefix bytes in Amino binary nor the type field in Amino JSON. They're just bytes.
[p2p] Remove salsa and ripemd primitives, in favor of using chacha as a stream cipher, and hkdf #2054
[tools] Removed make ensure_deps in favor of make get_vendor_deps
[types] CanonicalTime uses nanoseconds instead of clipping to ms
- breaks serialization/signing of all messages with a timestamp

FEATURES:

[tools] Added make check_dep
- ensures gopkg.lock is synced with gopkg.toml
- ensures no branches are used in the gopkg.toml

IMPROVEMENTS:

[blockchain] Improve fast-sync logic #1805
- tweak params
- only process one block at a time to avoid starving
[common] bit array functions which take in another parameter are now thread safe
[crypto] Switch hkdfchachapoly1305 to xchachapoly1305
[p2p] begin connecting to peers as soon a seed node provides them to you (#2093)

BUG FIXES:

[common] Safely handle cases where atomic write files already exist #2109
[privval] fix a deadline for accepting new connections in socket private validator.
[p2p] Allow startup if a configured seed node's IP can't be resolved (#1716)
[node] Fully exit when CTRL-C is pressed even if consensus state panics #2072

0.22.8

July 26th, 2018

BUG FIXES

[consensus, blockchain] Fix 0.22.7 below.

0.22.7

July 26th, 2018

BUG FIXES

[consensus, blockchain] Register the Evidence interface so it can be marshalled/unmarshalled by the blockchain and consensus reactors

0.22.6

July 24th, 2018

BUG FIXES

[rpc] Fix /blockchain endpoint
- (#2049) Fix OOM attack by returning error on negative input
- Fix result length to have max 20 (instead of 21) block metas
[rpc] Validate height is non-negative in /abci_query
[consensus] (#2050) Include evidence in proposal block parts (previously evidence was not being included in blocks!)
[p2p] (#2046) Close rejected inbound connections so file descriptor doesn't leak
[Gopkg] (#2053) Fix versions in the toml

0.22.5

July 23th, 2018

BREAKING CHANGES:

[crypto] Refactor tendermint/crypto into many subpackages
[libs/common] remove exponentially distributed random numbers

IMPROVEMENTS:

[abci, libs/common] Generated gogoproto static marshaller methods
[config] Increase default send/recv rates to 5 mB/s
[p2p] reject addresses coming from private peers
[p2p] allow persistent peers to be private

BUG FIXES:

[mempool] fixed a race condition when create_empty_blocks=false where a transaction is published at an old height.
[p2p] dial external IP setup by persistent_peers, not internal NAT IP
[rpc] make /status RPC endpoint resistant to consensus halt

0.22.4

July 14th, 2018

BREAKING CHANGES:

[genesis] removed deprecated app_options field.
[types] Genesis.AppStateJSON -> Genesis.AppState

FEATURES:

[tools] Merged in from github.com/tendermint/tools

BUG FIXES:

[tools/tm-bench] Various fixes
[consensus] Wait for WAL to stop on shutdown
[abci] Fix #1891, pending requests cannot hang when abci server dies. Previously a crash in BeginBlock could leave tendermint in broken state.

0.22.3

July 10th, 2018

IMPROVEMENTS

Update dependencies
- pin all values in Gopkg.toml to version or commit
- update golang/protobuf to v1.1.0

0.22.2

July 10th, 2018

IMPROVEMENTS

More cleanup post repo merge!
[docs] Include ecosystem.json and tendermint-bft.md from deprecated aib-data repository.
[config] Add instrumentation.max_open_connections, which limits the number of requests in flight to Prometheus server (if enabled). Default: 3.

BUG FIXES

[rpc] Allow unquoted integers in requests
- NOTE: this is only for URI requests. JSONRPC requests and all responses will use quoted integers (the proto3 JSON standard).
[consensus] Fix halt on shutdown

0.22.1

July 5th, 2018

IMPROVEMENTS

Cleanup post repo-merge.
[docs] Various improvements.

BUG FIXES

[state] Return error when EndBlock returns a 0-power validator that isn't already in the validator set.
[consensus] Shut down WAL properly.

0.22.0

July 2nd, 2018

BREAKING CHANGES:

[config]
- Remove max_block_size_txs and max_block_size_bytes in favor of consensus params from the genesis file.
- Rename skip_upnp to upnp, and turn it off by default.
- Change max_packet_msg_size back to max_packet_msg_payload_size
[rpc]
- All integers are encoded as strings (part of the update for Amino v0.10.1)
- syncing is now called catching_up
[types] Update Amino to v0.10.1
- Amino is now fully proto3 compatible for the basic types
- JSON-encoded types now use the type name instead of the prefix bytes
- Integers are encoded as strings
[crypto] Update go-crypto to v0.10.0 and merge into crypto
- privKey.Sign returns error.
- ed25519 address changed to the first 20-bytes of the SHA256 of the raw pubkey bytes
- tmlibs/merkle -> crypto/merkle. Uses SHA256 instead of RIPEMD160
[tmlibs] Update to v0.9.0 and merge into libs
- remove merkle package (moved to crypto/merkle)

FEATURES

[cmd] Added metrics (served under /metrics using a Prometheus client; disabled by default). See the new instrumentation section in the config and metrics guide.
[p2p] Add IPv6 support to peering.
[p2p] Add external_address to config to allow specifying the address for peers to dial

IMPROVEMENT

[rpc/client] Supports https and wss now.
[crypto] Make public key size into public constants
[mempool] Log tx hash, not entire tx
[abci] Merged in github.com/tendermint/abci
[crypto] Merged in github.com/tendermint/go-crypto
[libs] Merged in github.com/tendermint/tmlibs
[docs] Move from .rst to .md

BUG FIXES:

[rpc] Limit maximum number of HTTP/WebSocket connections (rpc.max_open_connections) and gRPC connections (rpc.grpc_max_open_connections). Check out "Running In Production" guide if you want to increase them.
[rpc] Limit maximum request body size to 1MB (header is limited to 1MB).
[consensus] Fix a halting bug where create_empty_blocks=false
[p2p] Fix panic in seed mode

0.21.0

June 21th, 2018

BREAKING CHANGES

[config] Change default ports from 4665X to 2665X. Ports over 32768 are ephemeral and reserved for use by the kernel.
[cmd] unsafe_reset_all removes the addrbook.json

IMPROVEMENT

[pubsub] Set default capacity to 0
[docs] Various improvements

BUG FIXES

[consensus] Fix an issue where we don't make blocks after fast_sync when create_empty_blocks=false
[mempool] Fix #1761 where we don't process txs if cache_size=0
[rpc] Fix memory leak in Websocket (when using /subscribe method)
[config] Escape paths in config - fixes config paths on Windows

0.20.0

June 6th, 2018

This is the first in a series of breaking releases coming to Tendermint after soliciting developer feedback and conducting security audits.

This release does not break any blockchain data structures or protocols other than the ABCI messages between Tendermint and the application.

Applications that upgrade for ABCI v0.11.0 should be able to continue running Tendermint v0.20.0 on blockchains created with v0.19.X

BREAKING CHANGES

[abci] Upgrade to v0.11.0
[abci] Change Query path for filtering peers by node ID from p2p/filter/pubkey/<id> to p2p/filter/id/<id>

0.19.9

June 5th, 2018

BREAKING CHANGES

[types/priv_validator] Moved to top level privval package

FEATURES

[config] Collapse PeerConfig into P2PConfig
[docs] Add quick-install script
[docs/spec] Add table of Amino prefixes

BUG FIXES

[rpc] Return 404 for unknown endpoints
[consensus] Flush WAL on stop
[evidence] Don't send evidence to peers that are behind
[p2p] Fix memory leak on peer disconnects
[rpc] Fix panic when per_page=0

0.19.8

June 4th, 2018

BREAKING:

[p2p] Remove auth_enc config option, peer connections are always auth encrypted. Technically a breaking change but seems no one was using it and arguably a bug fix :)

BUG FIXES

[mempool] Fix deadlock under high load when skip_timeout_commit=true and create_empty_blocks=false

0.19.7

May 31st, 2018

BREAKING:

[libs/pubsub] TagMap#Get returns a string value
[libs/pubsub] NewTagMap accepts a map of strings

FEATURES

[rpc] the RPC documentation is now published to https://tendermint.github.io/slate
[p2p] AllowDuplicateIP config option to refuse connections from same IP.
- true by default for now, false by default in next breaking release
[docs] Add docs for query, tx indexing, events, pubsub
[docs] Add some notes about running Tendermint in production

IMPROVEMENTS:

[consensus] Consensus reactor now receives events from a separate synchronous event bus, which is not dependant on external RPC load
[consensus/wal] do not look for height in older files if we've seen height - 1
[docs] Various cleanup and link fixes

0.19.6

May 29th, 2018

BUG FIXES

[blockchain] Fix fast-sync deadlock during high peer turnover

BUG FIX:

[evidence] Dont send peers evidence from heights they haven't synced to yet
[p2p] Refuse connections to more than one peer with the same IP
[docs] Various fixes

0.19.5

May 20th, 2018

BREAKING CHANGES

[rpc/client] TxSearch and UnconfirmedTxs have new arguments (see below)
[rpc/client] TxSearch returns ResultTxSearch
[version] Breaking changes to Go APIs will not be reflected in breaking version change, but will be included in changelog.

FEATURES

[rpc] /tx_search takes page (starts at 1) and per_page (max 100, default 30) args to paginate results
[rpc] /unconfirmed_txs takes limit (max 100, default 30) arg to limit the output
[config] mempool.size and mempool.cache_size options

IMPROVEMENTS

[docs] Lots of updates
[consensus] Only Fsync() the WAL before executing msgs from ourselves

BUG FIXES

[mempool] Enforce upper bound on number of transactions

0.19.4 (May 17th, 2018)

IMPROVEMENTS

[state] Improve tx indexing by using batches
[consensus, state] Improve logging (more consensus logs, fewer tx logs)
[spec] Moved to docs/spec (TODO cleanup the rest of the docs ...)

BUG FIXES

[consensus] Fix issue #1575 where a late proposer can get stuck

0.19.3 (May 14th, 2018)

FEATURES

[rpc] New /consensus_state returns just the votes seen at the current height

IMPROVEMENTS

[rpc] Add stringified votes and fraction of power voted to /dump_consensus_state
[rpc] Add PeerStateStats to /dump_consensus_state

BUG FIXES

[cmd] Set GenesisTime during tendermint init
[consensus] fix ValidBlock rules

0.19.2 (April 30th, 2018)

FEATURES:

[p2p] Allow peers with different Minor versions to connect
[rpc] /net_info includes n_peers

IMPROVEMENTS:

[p2p] Various code comments, cleanup, error types
[p2p] Change some Error logs to Debug

BUG FIXES:

[p2p] Fix reconnect to persistent peer when first dial fails
[p2p] Validate NodeInfo.ListenAddr
[p2p] Only allow (MaxNumPeers - MaxNumOutboundPeers) inbound peers
[p2p/pex] Limit max msg size to 64kB
[p2p] Fix panic when pex=false
[p2p] Allow multiple IPs per ID in AddrBook
[p2p] Fix before/after bugs in addrbook isBad()

0.19.1 (April 27th, 2018)

Note this release includes some small breaking changes in the RPC and one in the config that are really bug fixes. v0.19.1 will work with existing chains, and make Tendermint easier to use and debug. With <3

BREAKING (MINOR)

[config] Removed wal_light setting. If you really needed this, let us know

FEATURES:

[networks] moved in tooling from devops repo: terraform and ansible scripts for deploying testnets !
[cmd] Added gen_node_key command

BUG FIXES

Some of these are breaking in the RPC response, but they're really bugs!

[spec] Document address format and pubkey encoding pre and post Amino
[rpc] Lower case JSON field names
[rpc] Fix missing entries, improve, and lower case the fields in /dump_consensus_state
[rpc] Fix NodeInfo.Channels format to hex
[rpc] Add Validator address to /status
[rpc] Fix prove in ABCIQuery
[cmd] MarshalJSONIndent on init

0.19.0 (April 13th, 2018)

BREAKING:

[cmd] improved testnet command; now it can fill in persistent_peers for you in the config file and much more (see tendermint testnet --help for details)
[cmd] show_node_id now returns an error if there is no node key
[rpc]: changed the output format for the /status endpoint (see https://godoc.org/github.com/tendermint/tendermint/rpc/core#Status)

Upgrade from go-wire to go-amino. This is a sweeping change that breaks everything that is serialized to disk or over the network.

See github.com/tendermint/go-amino for details on the new format.

See scripts/wire2amino.go for a tool to upgrade genesis/priv_validator/node_key JSON files.

FEATURES

[test] docker-compose for local testnet setup (thanks Greg!)

0.18.0 (April 6th, 2018)

BREAKING:

[types] Merkle tree uses different encoding for varints (see tmlibs v0.8.0)
[types] ValidtorSet.GetByAddress returns -1 if no validator found
[p2p] require all addresses come with an ID no matter what
[rpc] Listening address must contain tcp:// or unix:// prefix

FEATURES:

[rpc] StartHTTPAndTLSServer (not used yet)
[rpc] Include validator's voting power in /status
[rpc] /tx and /tx_search responses now include the transaction hash
[rpc] Include peer NodeIDs in /net_info

IMPROVEMENTS:

[config] trim whitespace from elements of lists (like persistent_peers)
[rpc] /tx_search results are sorted by height
[p2p] do not try to connect to ourselves (ok, maybe only once)
[p2p] seeds respond with a bias towards good peers

BUG FIXES:

[rpc] fix subscribing using an abci.ResponseDeliverTx tag
[rpc] fix tx_indexers matchRange
[rpc] fix unsubscribing (see tmlibs v0.8.0)

0.17.1 (March 27th, 2018)

BUG FIXES:

[types] Actually support app_state in genesis as AppStateJSON

0.17.0 (March 27th, 2018)

BREAKING:

[types] WriteSignBytes -> SignBytes

IMPROVEMENTS:

[all] renamed dummy (persistent_dummy) to kvstore (persistent_kvstore) (name "dummy" is deprecated and will not work in the next breaking release)
[docs] note on determinism (docs/determinism.rst)
[genesis] app_options field is deprecated. please rename it to app_state in your genesis file(s). app_options will not work in the next breaking release
[p2p] dial seeds directly without potential peers
[p2p] exponential backoff for addrs in the address book
[p2p] mark peer as good if it contributed enough votes or block parts
[p2p] stop peer if it sends incorrect data, msg to unknown channel, msg we did not expect
[p2p] when auth_enc is true, all dialed peers must have a node ID in their address
[spec] various improvements
switched from glide to dep internally for package management
[wire] prep work for upgrading to new go-wire (which is now called go-amino)

FEATURES:

[config] exposed auth_enc flag to enable/disable encryption
[config] added the --p2p.private_peer_ids flag and PrivatePeerIDs config variable (see config for description)
[rpc] added /health endpoint, which returns empty result for now
[types/priv_validator] new format and socket client, allowing for remote signing

BUG FIXES:

[consensus] fix liveness bug by introducing ValidBlock mechanism

0.16.0 (February 20th, 2018)

BREAKING CHANGES:

[config] use $TMHOME/config for all config and json files
[p2p] old --p2p.seeds is now --p2p.persistent_peers (persistent peers to which TM will always connect to)
[p2p] now --p2p.seeds only used for getting addresses (if addrbook is empty; not persistent)
[p2p] NodeInfo: remove RemoteAddr and add Channels
- we must have at least one overlapping channel with peer
- we only send msgs for channels the peer advertised
[p2p/conn] pong timeout
[lite] comment out IAVL related code

FEATURES:

[p2p] added new /dial_peers&persistent=_ unsafe endpoint
[p2p] persistent node key in $THMHOME/config/node_key.json
[p2p] introduce peer ID and authenticate peers by ID using addresses like ID@IP:PORT
[p2p/pex] new seed mode crawls the network and serves as a seed.
[config] MempoolConfig.CacheSize
[config] P2P.SeedMode (--p2p.seed_mode)

IMPROVEMENT:

[p2p/pex] stricter rules in the PEX reactor for better handling of abuse
[p2p] various improvements to code structure including subpackages for pex and conn
[docs] new spec!
[all] speed up the tests!

BUG FIX:

[blockchain] StopPeerForError on timeout
[consensus] StopPeerForError on a bad Maj23 message
[state] flush mempool conn before calling commit
[types] fix priv val signing things that only differ by timestamp
[mempool] fix memory leak causing zombie peers
[p2p/conn] fix potential deadlock

0.15.0 (December 29, 2017)

BREAKING CHANGES:

[p2p] enable the Peer Exchange reactor by default
[types] add Timestamp field to Proposal/Vote
[types] add new fields to Header: TotalTxs, ConsensusParamsHash, LastResultsHash, EvidenceHash
[types] add Evidence to Block
[types] simplify ValidateBasic
[state] updates to support changes to the header
[state] Enforce <1/3 of validator set can change at a time

FEATURES:

[state] Send indices of absent validators and addresses of byzantine validators in BeginBlock
[state] Historical ConsensusParams and ABCIResponses
[docs] Specification for the base Tendermint data structures.
[evidence] New evidence reactor for gossiping and managing evidence
[rpc] /block_results?height=X returns the DeliverTx results for a given height.

IMPROVEMENTS:

[consensus] Better handling of corrupt WAL file

BUG FIXES:

[lite] fix race
[state] validate block.Header.ValidatorsHash
[p2p] allow seed addresses to be prefixed with eg. tcp://
[p2p] use consistent key to refer to peers so we dont try to connect to existing peers
[cmd] fix tendermint init to ignore files that are there and generate files that aren't.

0.14.0 (December 11, 2017)

BREAKING CHANGES:

consensus/wal: removed separator
rpc/client: changed Subscribe/Unsubscribe/UnsubscribeAll funcs signatures to be identical to event bus.

FEATURES:

new tendermint lite command (and lite/proxy pkg) for running a light-client RPC proxy. NOTE it is currently insecure and its APIs are not yet covered by semver

IMPROVEMENTS:

rpc/client: can act as event bus subscriber (See https://github.com/tendermint/tendermint/issues/945).
p2p: use exponential backoff from seconds to hours when attempting to reconnect to persistent peer
config: moniker defaults to the machine's hostname instead of "anonymous"

BUG FIXES:

p2p: no longer exit if one of the seed addresses is incorrect

0.13.0 (December 6, 2017)

BREAKING CHANGES:

abci: update to v0.8 using gogo/protobuf; includes tx tags, vote info in RequestBeginBlock, data.Bytes everywhere, use int64, etc.
types: block heights are now int64 everywhere
types & node: EventSwitch and EventCache have been replaced by EventBus and EventBuffer; event types have been overhauled
node: EventSwitch methods now refer to EventBus
rpc/lib/types: RPCResponse is no longer a pointer; WSRPCConnection interface has been modified
rpc/client: WaitForOneEvent takes an EventsClient instead of types.EventSwitch
rpc/client: Add/RemoveListenerForEvent are now Subscribe/Unsubscribe
rpc/core/types: ResultABCIQuery wraps an abci.ResponseQuery
rpc: /subscribe and /unsubscribe take query arg instead of event
rpc: /status returns the LatestBlockTime in human readable form instead of in nanoseconds
mempool: cached transactions return an error instead of an ABCI response with BadNonce

FEATURES:

rpc: new /unsubscribe_all WebSocket RPC endpoint
rpc: new /tx_search endpoint for filtering transactions by more complex queries
p2p/trust: new trust metric for tracking peers. See ADR-006
config: TxIndexConfig allows to set what DeliverTx tags to index

IMPROVEMENTS:

New asynchronous events system using tmlibs/pubsub
logging: Various small improvements
consensus: Graceful shutdown when app crashes
tests: Fix various non-deterministic errors
p2p: more defensive programming

BUG FIXES:

consensus: fix panic where prs.ProposalBlockParts is not initialized
p2p: fix panic on bad channel

0.12.1 (November 27, 2017)

BUG FIXES:

upgrade tmlibs dependency to enable Windows builds for Tendermint

0.12.0 (October 27, 2017)

BREAKING CHANGES:

rpc/client: websocket ResultsCh and ErrorsCh unified in ResponsesCh.
rpc/client: ABCIQuery no longer takes prove
state: remove GenesisDoc from state.
consensus: new binary WAL format provides efficiency and uses checksums to detect corruption
- use scripts/wal2json to convert to json for debugging

FEATURES:

new Verifiers pkg contains the tendermint light-client library (name subject to change)!
rpc: /genesis includes the app_options .
rpc: /abci_query takes an additional height parameter to support historical queries.
rpc/client: new ABCIQueryWithOptions supports options like trusted (set false to get a proof) and height to query a historical height.

IMPROVEMENTS:

rpc: /genesis result includes app_options
rpc/lib/client: add jitter to reconnects.
rpc/lib/types: RPCError satisfies the error interface.

BUG FIXES:

rpc/client: fix ws deadlock after stopping
blockchain: fix panic on AddBlock when peer is nil
mempool: fix sending on TxsAvailable when a tx has been invalidated
consensus: dont run WAL catchup if we fast synced

0.11.1 (October 10, 2017)

IMPROVEMENTS:

blockchain/reactor: respondWithNoResponseMessage for missing height

BUG FIXES:

rpc: fixed client WebSocket timeout
rpc: client now resubscribes on reconnection
rpc: fix panics on missing params
rpc: fix /dump_consensus_state to have normal json output (NOTE: technically breaking, but worth a bug fix label)
types: fixed out of range error in VoteSet.addVote
consensus: fix wal autofile via https://github.com/tendermint/tmlibs/blob/master/CHANGELOG.md#032-october-2-2017

0.11.0 (September 22, 2017)

BREAKING:

genesis file: validator amount is now power
abci: Info, BeginBlock, InitChain all take structs
rpc: various changes to match JSONRPC spec (http://www.jsonrpc.org/specification), including breaking ones:
- requests that previously returned HTTP code 4XX now return 200 with an error code in the JSONRPC.
- rpctypes.RPCResponse uses new RPCError type instead of string.
cmd: if there is no genesis, exit immediately instead of waiting around for one to show.
types: Signer.Sign returns an error.
state: every validator set change is persisted to disk, which required some changes to the State structure.
p2p: new p2p.Peer interface used for all reactor methods (instead of *p2p.Peer struct).

FEATURES:

rpc: /validators?height=X allows querying of validators at previous heights.
rpc: Leaving the height param empty for /block, /validators, and /commit will return the value for the latest height.

IMPROVEMENTS:

docs: Moved all docs from the website and tools repo in, converted to .rst, and cleaned up for presentation on tendermint.readthedocs.io

BUG FIXES:

fix WAL openning issue on Windows

0.10.4 (September 5, 2017)

IMPROVEMENTS:

docs: Added Slate docs to each rpc function (see rpc/core)
docs: Ported all website docs to Read The Docs
config: expose some p2p params to tweak performance: RecvRate, SendRate, and MaxMsgPacketPayloadSize
rpc: Upgrade the websocket client and server, including improved auto reconnect, and proper ping/pong

BUG FIXES:

consensus: fix panic on getVoteBitArray
consensus: hang instead of panicking on byzantine consensus failures
cmd: dont load config for version command

0.10.3 (August 10, 2017)

FEATURES:

control over empty block production:
- new flag, --consensus.create_empty_blocks; when set to false, blocks are only created when there are txs or when the AppHash changes.
- new config option, consensus.create_empty_blocks_interval; an empty block is created after this many seconds.
- in normal operation, create_empty_blocks = true and create_empty_blocks_interval = 0, so blocks are being created all the time (as in all previous versions of tendermint). The number of empty blocks can be reduced by increasing create_empty_blocks_interval or by setting create_empty_blocks = false.
- new TxsAvailable() method added to Mempool that returns a channel which fires when txs are available.
- new heartbeat message added to consensus reactor to notify peers that a node is waiting for txs before entering propose step.
rpc: Add syncing field to response returned by /status. Is true while in fast-sync mode.

IMPROVEMENTS:

various improvements to documentation and code comments

BUG FIXES:

mempool: pass height into constructor so it doesn't always start at 0

0.10.2 (July 10, 2017)

FEATURES:

Enable lower latency block commits by adding consensus reactor sleep durations and p2p flush throttle timeout to the config

IMPROVEMENTS:

More detailed logging in the consensus reactor and state machine
More in-code documentation for many exposed functions, especially in consensus/reactor.go and p2p/switch.go
Improved readability for some function definitions and code blocks with long lines

0.10.1 (June 28, 2017)

FEATURES:

Use --trace to get stack traces for logged errors
types: GenesisDoc.ValidatorHash returns the hash of the genesis validator set
types: GenesisDocFromFile parses a GenesiDoc from a JSON file

IMPROVEMENTS:

Add a Code of Conduct
Variety of improvements as suggested by megacheck tool
rpc: deduplicate tests between rpc/client and rpc/tests
rpc: addresses without a protocol prefix default to tcp://. http:// is also accepted as an alias for tcp://
cmd: commands are more easily reuseable from other tools
DOCKER: automate build/push

BUG FIXES:

Fix log statements using keys with spaces (logger does not currently support spaces)
rpc: set logger on websocket connection
rpc: fix ws connection stability by setting write deadline on pings

0.10.0 (June 2, 2017)

Includes major updates to configuration, logging, and json serialization. Also includes the Grand Repo-Merge of 2017.

BREAKING CHANGES:

Config and Flags:
- The config map is replaced with a Config struct, containing substructs: BaseConfig, P2PConfig, MempoolConfig, ConsensusConfig, RPCConfig
- This affects the following flags:
  - --seeds is now --p2p.seeds
  - --node_laddr is now --p2p.laddr
  - --pex is now --p2p.pex
  - --skip_upnp is now --p2p.skip_upnp
  - --rpc_laddr is now --rpc.laddr
  - --grpc_laddr is now --rpc.grpc_laddr
- Any configuration option now within a substract must come under that heading in the config.toml, for instance:
```
[p2p]
laddr="tcp://1.2.3.4:46656"

[consensus]
timeout_propose=1000
```
- Use viper and DefaultConfig() / TestConfig() functions to handle defaults, and remove config/tendermint and config/tendermint_test
- Change some function and method signatures to
- Change some function and method signatures accomodate new config
Logger
- Replace static log15 logger with a simple interface, and provide a new implementation using go-kit. See our new logging library and blog post for more details
- Levels warn and notice are removed (you may need to change them in your config.toml!)
- Change some function and method signatures to accept a logger
JSON serialization:
- Replace [TypeByte, Xxx] with {"type": "some-type", "data": Xxx} in RPC and all .json files by using go-wire/data. For instance, a public key is now:
```
"pub_key": {
  "type": "ed25519",
  "data": "83DDF8775937A4A12A2704269E2729FCFCD491B933C4B0A7FFE37FE41D7760D0"
}
```
- Remove type information about RPC responses, so [TypeByte, {"jsonrpc": "2.0", ... }] is now just {"jsonrpc": "2.0", ... }
- Change []byte to data.Bytes in all serialized types (for hex encoding)
- Lowercase the JSON tags in ValidatorSet fields
- Introduce EventDataInner for serializing events
Other:
- Send InitChain message in handshake if appBlockHeight == 0
- Do not include the Accum field when computing the validator hash. This makes the ValidatorSetHash unique for a given validator set, rather than changing with every block (as the Accum changes)
- Unsafe RPC calls are not enabled by default. This includes /dial_seeds, and all calls prefixed with unsafe. Use the --rpc.unsafe flag to enable.

FEATURES:

Per-module log levels. For instance, the new default is state:info,*:error, which means the state package logs at info level, and everything else logs at error level
Log if a node is validator or not in every consensus round
Use ldflags to set git hash as part of the version
Ignore address and pub_key fields in priv_validator.json and overwrite them with the values derrived from the priv_key

IMPROVEMENTS:

Merge tendermint/go-p2p -> tendermint/tendermint/p2p and tendermint/go-rpc -> tendermint/tendermint/rpc/lib
Update paths for grand repo merge:
- go-common -> tmlibs/common
- go-data -> go-wire/data
- All other go- libs, except go-crypto and go-wire, are merged under tmlibs
No global loggers (loggers are passed into constructors, or preferably set with a SetLogger method)
Return HTTP status codes with errors for RPC responses
Limit /blockchain_info call to return a maximum of 20 blocks
Use .Wrap() and .Unwrap() instead of eg. PubKeyS for go-crypto types
RPC JSON responses use pretty printing (via json.MarshalIndent)
Color code different instances of the consensus for tests
Isolate viper to cmd/tendermint/commands and do not read config from file for tests

0.9.2 (April 26, 2017)

BUG FIXES:

Fix bug in ResetPrivValidator where we were using the global config and log (causing external consumers, eg. basecoin, to fail).

0.9.1 (April 21, 2017)

FEATURES:

Transaction indexing - txs are indexed by their hash using a simple key-value store; easily extended to more advanced indexers
New /tx?hash=X endpoint to query for transactions and their DeliverTx result by hash. Optionally returns a proof of the tx's inclusion in the block
tendermint testnet command initializes files for a testnet

IMPROVEMENTS:

CLI now uses Cobra framework
TMROOT is now TMHOME (TMROOT will stop working in 0.10.0)
/broadcast_tx_XXX also returns the Hash (can be used to query for the tx)
/broadcast_tx_commit also returns the height the block was committed in
ABCIResponses struct persisted to disk before calling Commit; makes handshake replay much cleaner
WAL uses #ENDHEIGHT instead of #HEIGHT (#HEIGHT will stop working in 0.10.0)
Peers included via --seeds, under seeds in the config, or in /dial_seeds are now persistent, and will be reconnected to if the connection breaks

BUG FIXES:

Fix bug in fast-sync where we stop syncing after a peer is removed, even if they're re-added later
Fix handshake replay to handle validator set changes and results of DeliverTx when we crash after app.Commit but before state.Save()

0.9.0 (March 6, 2017)

BREAKING CHANGES:

Update ABCI to v0.4.0, where Query is now Query(RequestQuery) ResponseQuery, enabling precise proofs at particular heights:

message RequestQuery{
	bytes data = 1;
	string path = 2;
	uint64 height = 3;
	bool prove = 4;
}

message ResponseQuery{
	CodeType          code        = 1;
	int64             index       = 2;
	bytes             key         = 3;
	bytes             value       = 4;
	bytes             proof       = 5;
	uint64            height      = 6;
	string            log         = 7;
}

BlockMeta data type unifies its Hash and PartSetHash under a BlockID:

type BlockMeta struct {
	BlockID BlockID `json:"block_id"` // the block hash and partsethash
	Header  *Header `json:"header"`   // The block's Header
}

ValidatorSet.Proposer is exposed as a field and persisted with the State. Use GetProposer() to initialize or update after validator-set changes.
tendermint gen_validator command output is now pure JSON

FEATURES:

New RPC endpoint /commit?height=X returns header and commit for block at height X
Client API for each endpoint, including mocks for testing

IMPROVEMENTS:

Node is now a BaseService
Simplified starting Tendermint in-process from another application
Better organized Makefile
Scripts for auto-building binaries across platforms
Docker image improved, slimmed down (using Alpine), and changed from tendermint/tmbase to tendermint/tendermint
New repo files: CONTRIBUTING.md, Github ISSUE_TEMPLATE, CHANGELOG.md
Improvements on CircleCI for managing build/test artifacts
Handshake replay is doen through the consensus package, possibly using a mockApp
Graceful shutdown of RPC listeners
Tests for the PEX reactor and DialSeeds

BUG FIXES:

Check peer.Send for failure before updating PeerState in consensus
Fix panic in /dial_seeds with invalid addresses
Fix proposer selection logic in ValidatorSet by taking the address into account in the accumComparable
Fix inconcistencies with ValidatorSet.Proposer across restarts by persisting it in the State

0.8.0 (January 13, 2017)

BREAKING CHANGES:

New data type BlockID to represent blocks:

type BlockID struct {
	Hash        []byte        `json:"hash"`
	PartsHeader PartSetHeader `json:"parts"`
}

Vote data type now includes validator address and index:

type Vote struct {
	ValidatorAddress []byte           `json:"validator_address"`
	ValidatorIndex   int              `json:"validator_index"`
	Height           int              `json:"height"`
	Round            int              `json:"round"`
	Type             byte             `json:"type"`
	BlockID          BlockID          `json:"block_id"` // zero if vote is nil.
	Signature        crypto.Signature `json:"signature"`
}

Update TMSP to v0.3.0, where it is now called ABCI and AppendTx is DeliverTx
Hex strings in the RPC are now "0x" prefixed

FEATURES:

New message type on the ConsensusReactor, Maj23Msg, for peers to alert others they've seen a Maj23, in order to track and handle conflicting votes intelligently to prevent Byzantine faults from causing halts:

type VoteSetMaj23Message struct {
	Height  int
	Round   int
	Type    byte
	BlockID types.BlockID
}

Configurable block part set size
Validator set changes
Optionally skip TimeoutCommit if we have all the votes
Handshake between Tendermint and App on startup to sync latest state and ensure consistent recovery from crashes
GRPC server for BroadcastTx endpoint

IMPROVEMENTS:

Less verbose logging
Better test coverage (37% -> 49%)
Canonical SignBytes for signable types
Write-Ahead Log for Mempool and Consensus via tmlibs/autofile
Better in-process testing for the consensus reactor and byzantine faults
Better crash/restart testing for individual nodes at preset failure points, and of networks at arbitrary points
Better abstraction over timeout mechanics

BUG FIXES:

Fix memory leak in mempool peer
Fix panic on POLRound=-1
Actually set the CommitTime
Actually send BeginBlock message
Fix a liveness issues caused by Byzantine proposals/votes. Uses the new Maj23Msg.

0.7.4 (December 14, 2016)

FEATURES:

Enable the Peer Exchange reactor with the --pex flag for more resilient gossip network (feature still in development, beware dragons)

IMPROVEMENTS:

Remove restrictions on RPC endpoint /dial_seeds to enable manual network configuration

0.7.3 (October 20, 2016)

IMPROVEMENTS:

Type safe FireEvent
More WAL/replay tests
Cleanup some docs

BUG FIXES:

Fix deadlock in mempool for synchronous apps
Replay handles non-empty blocks
Fix race condition in HeightVoteSet

0.7.2 (September 11, 2016)

BUG FIXES:

Set mustConnect=false so tendermint will retry connecting to the app

0.7.1 (September 10, 2016)

FEATURES:

New TMSP connection for Query/Info
New RPC endpoints:
- tmsp_query
- tmsp_info
Allow application to filter peers through Query (off by default)

IMPROVEMENTS:

TMSP connection type enforced at compile time
All listen/client urls use a "tcp://" or "unix://" prefix

BUG FIXES:

Save LastSignature/LastSignBytes to priv_validator.json for recovery
Fix event unsubscribe
Fix fastsync/blockchain reactor

0.7.0 (August 7, 2016)

BREAKING CHANGES:

Strict SemVer starting now!
Update to ABCI v0.2.0
Validation types now called Commit
NewBlock event only returns the block header

FEATURES:

TMSP and RPC support TCP and UNIX sockets
Addition config options including block size and consensus parameters
New WAL mode cswal_light; logs only the validator's own votes
New RPC endpoints:
- for starting/stopping profilers, and for updating config
- /broadcast_tx_commit, returns when tx is included in a block, else an error
- /unsafe_flush_mempool, empties the mempool

IMPROVEMENTS:

Various optimizations
Remove bad or invalidated transactions from the mempool cache (allows later duplicates)
More elaborate testing using CircleCI including benchmarking throughput on 4 digitalocean droplets

BUG FIXES:

Various fixes to WAL and replay logic
Various race conditions

PreHistory

Strict versioning only began with the release of v0.7.0, in late summer 2016. The project itself began in early summer 2014 and was workable decentralized cryptocurrency software by the end of that year. Through the course of 2015, in collaboration with Eris Industries (now Monax Indsutries), many additional features were integrated, including an implementation from scratch of the Ethereum Virtual Machine. That implementation now forms the heart of Burrow. In the later half of 2015, the consensus algorithm was upgraded with a more asynchronous design and a more deterministic and robust implementation.

By late 2015, frustration with the difficulty of forking a large monolithic stack to create alternative cryptocurrency designs led to the invention of the Application Blockchain Interface (ABCI), then called the Tendermint Socket Protocol (TMSP). The Ethereum Virtual Machine and various other transaction features were removed, and Tendermint was whittled down to a core consensus engine driving an application running in another process. The ABCI interface and implementation were iterated on and improved over the course of 2016, until versioned history kicked in with v0.7.0.

97 KiB Raw Blame History

Changelog

v0.31.0

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v0.30.2

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v0.30.1

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v0.27.3

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