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Ledger

The ledger in Midnight is a public record of contract states and token states, consisting of Zswap’s cryptographic commitments and a mapping of contract addresses to their respective states.

Link to related documentation

12 May 2025

Midnight 4.0.0 Ledger release notes​

Learn about the latest updates and improvements to the Midnight Ledger, including new features, bug fixes, and breaking changes designed to enhance functionality and stability.

Stable Release​

  • Version: 4.0.0
  • Audience: Developers integrating with the Midnight ecosystem
  • Environment: Production-ready

This release (4.0.0) is considered stable and production-ready. It can safely be deployed in public and production environments.

Changelog​

Breaking​

  • Integrated with the new storage model, making required objects Storable to allow storing MPT leafs as Sps.
  • Added segment IDs to Zswap constructors. These should be set to 1 for fallible offers, and 0 for guaranteed offers.
  • Renamed ZswapLocalStateNoKeys to ZswapLocalState, removing the existing (with keys) state.
  • Switch from Pluto-Eris to BLS12-381.
  • Switched to using data providers instead of direct prover keys and parameters.

Features​

  • Add a data provider to fetch key material for Midnight. The source of this may be overridden with the MIDNIGHT_PARAM_SOURCE environment variable.

Artifacts​