# Unreleased Changes

## v0.37.0

Special thanks to external contributors on this release:

Friendly reminder, we have a [bug bounty program](https://hackerone.com/tendermint).

### BREAKING CHANGES

- CLI/RPC/Config
  - [config] \#9259 Rename the fastsync section and the fast_sync key blocksync and block_sync respectively

- Apps
  - [abci/counter] \#6684 Delete counter example app
  - [abci] \#5783 Make length delimiter encoding consistent (`uint64`) between ABCI and P2P wire-level protocols
  - [abci] \#9145 Removes unused Response/Request `SetOption` from ABCI (@samricotta)
  - [abci/params] \#9287 Deduplicate `ConsensusParams` and `BlockParams` so only `types` proto definitions are used (@cmwaters)
    - Remove `TimeIotaMs` and use a hard-coded 1 millisecond value to ensure monotonically increasing block times.
    - Rename `AppVersion` to `App` so as to not stutter.
  - [types] \#9287 Reduce the use of protobuf types in core logic. (@cmwaters)
    - `ConsensusParams`, `BlockParams`, `ValidatorParams`, `EvidenceParams`, `VersionParams` have become native types.
      They still utilize protobuf when being sent over the wire or written to disk.
    - Moved `ValidateConsensusParams` inside (now native type) `ConsensusParams`, and renamed it to `ValidateBasic`.
  - [abci] \#9301 New ABCI methods `PrepareProposal` and `ProcessProposal` which give the app control over transactions proposed and allows for verification of proposed blocks.
  - [abci] \#8216 Renamed `EvidenceType` to `MisbehaviorType` and `Evidence` to `Misbehavior` as a more accurate label of their contents. (@williambanfield, @sergio-mena)
  - [abci] \#9122 Renamed `LastCommitInfo` to `CommitInfo` in preparation for vote extensions. (@cmwaters)
  - [abci] \#8656, \#8901 Added cli commands for `PrepareProposal` and `ProcessProposal`. (@jmalicevic, @hvanz)
  - [abci] \#6403 Change the `key` and `value` fields from `[]byte` to `string` in the `EventAttribute` type. (@alexanderbez)

- P2P Protocol

- Go API
    - [all] \#9144 Change spelling from British English to American (@cmwaters)
        - Rename "Subscription.Cancelled()" to "Subscription.Canceled()" in libs/pubsub

- Blockchain Protocol

### FEATURES

- [abci] \#9301 New ABCI methods `PrepareProposal` and `ProcessProposal` which give the app control over transactions proposed and allows for verification of proposed blocks.
- [rpc] \#9759 Added `match_event` query parameter to indicate to Tendermint that the query should match event attributes within events, not only within a height.(@jmalicevic)

### IMPROVEMENTS

- [state/kvindexer] \#9759 Added `match.event` keyword to support condition evalution based on the event attributes belong to. (@jmalicevic)
- [crypto] \#9250 Update to use btcec v2 and the latest btcutil. (@wcsiu)
- [proto] \#9356 Migrate from `gogo/protobuf` to `cosmos/gogoproto` (@julienrbrt)
- [rpc] \#9276 Added `header` and `header_by_hash` queries to the RPC client (@samricotta)
- [abci] \#5706 Added `AbciVersion` to `RequestInfo` allowing applications to check ABCI version when connecting to Tendermint. (@marbar3778)
- [consensus] \#9760 Save peer LastCommit correctly to achieve 50% reduction in gossiped precommits. (@williambanfield)

### BUG FIXES

- [consensus] \#9229 fix round number of `enterPropose` when handling `RoundStepNewRound` timeout. (@fatcat22)
- [docker] \#9073 enable cross platform build using docker buildx
- [docker] \#9462 ensure Docker image uses consistent version of Go
- [blocksync] \#9518 handle the case when the sending queue is full: retry block request after a timeout