v2.0.0-dev.1

Breaking Changes

• Consensus: new CONSENSUS_VERSION_2 (proposer liveness and round skipping); once a chain enables it, only nodes running this version or later can follow it, so every node must upgrade before activation (#1572)
• RPC: broadcast_tx* return the original CheckTx rejection, not "Tx already exists in cache", for resubmitted invalid transactions when keep-invalid-txs-in-cache is enabled (#1530)
• RPC: broadcast_evidence returns ErrEvidenceDisabled while the committed evidence.max_bytes is zero (#1547)

Migration Notes

• types.PrivValidator gains SignProposerHeartbeat and SignRoundSkipVote; signer implementations outside this repository must add them (#1572)
• Exported database APIs use Tenderdash's own libs/db interfaces; custom providers must update imports and Batch/Iterator return types (#1551)
• The PostgreSQL event sink and tx-index.psql-conn are removed; select kv or null indexing explicitly (#1553)
• Invalid P2P configuration prevents startup; an explicit zero incoming-connection-window is rejected (#1550)
• ExtendVote responses with DEFAULT vote extensions are rejected with a clear error; they previously crashed the signer or produced votes peers rejected (#1565)
• The CLI waits up to --shutdown-timeout (default 30s) for cleanup after cancellation; supervisors need a longer termination grace period, and embedded service callers must Stop then Wait (#1513)
• The Go module path stays github.com/dashpay/tenderdash, so Go tooling does not resolve v2.x tags; Go consumers pin commit pseudo-versions

Protocol Versions

• ABCI 1.5.0: consensus params add CONSENSUS_VERSION_2 and the proposer_heartbeat/proposer_silence timeouts (#1572)
• P2P protocol 11: new ProposerHeartbeat, RoundSkipVote and RoundSkipCertificate state-channel messages, sent only on chains at consensus version 2 (#1572)
• Block protocol stays 14

Features

• Hand a silent proposer's idle round to the next proposer; activated by consensus version 2, which every node must support before a chain enables it (#1572)
• Follow live chain evidence settings (#1547)

Bug Fixes

• Validate a fresh block's proposer before prevoting (#1527)
• Never extend a relock precommit without ProcessProposal for the round (#1523)
• Propose a freshly built block without a POL round (#1564)
• Verify commit vote extensions before a commit is taken (#1520)
• Replay blocks with their historical quorum (#1567)
• Enforce peer penalties and validate network settings (#1550)
• Stop router dialing when the context deadline expires (#1588)
• Trim the simple priority queue on every push (#1596)
• Keep healthy block sync peers during slow local application (#1548)
• Schedule block sync peers by active response service (#1549)

Refactor

• Own GoLevelDB and memory database adapters (#1551)
• Remove the PostgreSQL event sink (#1553)

Documentation

• Add a source-derived consensus protocol specification (#1562)
• Migrate generated documentation to mdBook (#1585)
• Align consensus references and guides with current behavior (#1586)

Testing

• Exercise block sync during slow local application (#1560)
• Wait for goroutines before first-commit cleanup (#1507)

Build

• Use supported Alpine 3.24 Docker bases (#1591)
• Bump google.golang.org/grpc to 1.85.0 (#1580)
• Bump github.com/fxamacker/cbor/v2 to 2.10.0 (#1539, #1579)
• Bump github.com/prometheus/common to 0.73.1 (#1542, #1581)
• Bump github.com/prometheus/client_golang to 1.25.0 (#1538)
• Bump github.com/oasisprotocol/oasis-core/go to 0.2603.0 (#1531)
• Bump github.com/bufbuild/buf to 1.75.0 (#1556, #1570)

Miscellaneous Tasks

• Replace the release script and GoReleaser workflow with the Dash Platform release process (#1552)
• Align dev checks and Docker release versions; manual Docker runs build only existing release tags (#1594)
• Build and test on Ubuntu 26.04 (#1590)
• Pin Docker workflow actions to commit SHAs and restrict token permissions (#1589)
• Replace Janitor with native PR concurrency (#1592)
• Migrate proto lint to buf-action (#1561)
• Pin golangci-lint to v2.14.0 and migrate to gomodguard_v2 (#1524)
• Run Claudius reviews after green tests, on push or label (#1512, #1516, #1525, #1526)
• Align the PR template with the TL;DR / user story / scenario structure (#1529)
• Update CI actions and PR Hygiene pins (#1505, #1508, #1510, #1511, #1514, #1522, #1528, #1533, #1557, #1571)

Release Artifacts

• Docker image: dashpay/tenderdash:2.0.0-dev.1. As a prerelease, it does not move the latest or other stable tags.
• No binaries are attached to this prerelease.
• The release tag is not signed.

Full Changelog: v1.8.2...v2.0.0-dev.1