Release Notes - v0.191.0

v0.191.0 (August 1, 2026)

Title: Strengthen validation and add node-to-client v21 support

Date: August 1, 2026

Version: v0.191.0

This release tightens address, redeemer, and delegation validation, preserves unknown ledger errors for Dijkstra-era handling, returns clearer errors for unknown protocol messages, and adds node-to-client protocol version 21 support.

💪 Improvements

• Fixed raw address validation: raw address decoding now rejects reserved CIP-0019 address types and invalid network IDs.

• Improved protocol error reporting: unknown CBOR message types now return explicit errors across blockfetch, chainsync, handshake, keepalive, leiosfetch, localstatequery, localtxmonitor, localtxsubmission, peersharing, and txsubmission.

• Expanded ledger error handling: unknown ledger error constructors now stay visible instead of defaulting to an era, Dijkstra-era cases receive dedicated handling, and marshal validation now rejects malformed ledger failures.

• Corrected redeemer validation: unmatched redeemer purposes now fail validation instead of being dropped.

• Updated block classification: block types now follow their declared protocol ranges.

• Refined genesis validation: CBOR marshal now rejects unknown genesis network IDs.

• Added node-to-client v21 support: local-state/query version 21 now uses the updated wire shape, and GenesisConfigResult now uses the renamed fields.

• Tightened delegation validation: delegation checks now reject unknown DRep types.

🙏 Thank You

Thank you for following gOuroboros releases.

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