Release Notes - v0.67.0

v0.67.0 (July 24, 2026)

Title: Expand consensus controls, mempool behavior, and chain recovery

Date: July 24, 2026

Version: v0.67.0

This release expands stake distribution and delegation controls, adds a configurable mempool backend, tightens chain recovery, and updates Mithril verification key locations. Several consensus-affecting changes remain behind configuration gates or keep safer defaults in place.

Recommended Network Compatibility ⚠️

Network	Compatible
mainnet	⛔
preprod-testnet	✅
preview-testnet	✅
musashi	✅

✨ Highlights

• Added full pot distribution support behind configuration gates so operators can opt in to CIP-163 reward behavior.

• Introduced pledge leverage support for pool operators that want CIP-50 reward calculations.

• Enabled a configurable FIFO mempool backend for deployments that need ordered transaction handling.

• Improved mempool shutdown so the node stops accepting new work before it exits.

• Returned immutable mempool snapshots so queries stay consistent while validation continues.

• Released mempool pool locks during validation so transaction checks keep moving.

• Strengthened chain selection by corroborating Genesis sources before the node selects a chain.

• Added delegator inactivity handling behind configuration gates so CIP-163 behavior stays disabled by default.

• Updated stake-snapshot queries to accept GetCBOR wrappers.

• Fixed a reward stake mismatch crash that could interrupt ledger processing.

• Improved primary chain rewind handling so the node can recover cleanly after a rollback.

• Refined Mithril verification key URLs to point at the current location.

• Expanded the devnet and conformance tooling with Dingo-only support.

• Augmented antithesis builds with the dedicated build tag.

• Removed the issue-close CI automation to simplify release housekeeping.

• Updated the gRPC dependency to v1.82.1.

• Refreshed the gouroboros dependency to 0.189.2.

Full Changelog: v0.66.2…v0.67.0