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Onchain Runtime

Onchain Runtime is a component of the Midnight infrastructure that enables zero-knowledge proof generation, transaction verification, and privacy-preserving transaction processing.

To learn more, see the Onchain Runtime Tutorial

12 May 2025

Midnight 4.0.0 Onchain Runtime Release Notes​

Learn about the latest updates and improvements to the Midnight Onchain Runtime, 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 (version 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​