Release Notes - v0.193.0

v0.193.0 (August 10, 2026)

Title: Strengthen Byron delegation validation and validity bounds

Date: August 10, 2026

Version: v0.193.0

This release strengthens Byron delegation certificate validation and preserves transaction validity bounds, including explicit zero-valued bounds, so consensus and ledger behavior stay aligned with chain data.

💪 Improvements

• Fixed Byron delegation certificate verification: malformed issuer, delegate, and signature sizes now fail validation, the Cardano Byron signing payload layout now verifies correctly, and validation fails closed by default. Tests now cover a real mainnet vector plus deterministic positive and negative cases.

• Updated transaction validity handling: decoding transaction CBOR now preserves lower and upper bounds, including explicit zero-valued bounds, and Plutus validity ranges now match cardano-ledger upper-bound semantics. Test coverage expanded with ouroboros-mock validity fixtures, and dependencies now point to ouroboros-mock v0.15.1 and plutigo v0.3.0.

🙏 Thank You

Thank you for following gOuroboros releases.

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