Release Notes - v0.198.0

v0.198.0 (August 25, 2026)

Title: Strengthen ledger validation and transaction encoding

Date: August 25, 2026

Version: v0.198.0

This release improves ledger validation and keeps rebuilt transactions aligned with the data originally submitted.

💪 Improvements

• Fixed Conway data validation: Ledger decoding now rejects null or undefined values, invalid enum values, empty governance maps, missing keys, and certificate types that Conway and Dijkstra do not support.

• Preserved Shelley and Allegra transaction data: Rebuilt transaction bodies and shared witness sets retain their original encoded data, preventing inflated sizes that can produce incorrect fees and maximum transaction size checks before Alonzo.

• Strengthened Plutus script validation: V3 and V4 wrappers now reject trailing data after a complete wrapper, while V1 and V2 retain their existing behavior.

Compare: v0.197.0…v0.198.0

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Docs authored by Doc Holiday