April 2026 monthly summary for lambdaclass/ethereum_rust. Focused on reliability improvements and build hygiene through targeted bug fixes and dependency optimization in the guest program. Delivered clearer error messages for critical code paths and reduced dependency surface to lower build risk and maintenance overhead.

March 2026: Delivered SP1 zkVM support for the Ethrex Guest Program in lambdaclass/ethereum_rust. Implemented core backend updates to support SP1 by returning affine coordinates in the shared crypto backend and by providing an SP1-specific proof verification path. Added necessary store schema updates (STORE_SCHEMA_VERSION) to accommodate breaking changes and enable a clean upgrade/downgrade experience. The work enables SP1 emulation/proving workflows, improves cryptographic correctness, and maintains compatibility with existing tooling. Commit reference anchors (aac639242379c2796ad1e71d334beb3b805b2e55).

Month 2025-11 — Key activities focused on expanding Rust library reach by enabling no_std compatibility for the common crate in a16z/jolt. Implemented no_std support by disabling default features for derive_more and replacing std::cmp::max with core::cmp::max, enabling usage in embedded and constrained environments. This work is tracked under commit dbc011e29a43b73f29b534f3a63eca43ed85baf5 (fix: make crate `common` `no_std` compatible #1078).

Month: 2025-05 — Development monthly summary focusing on key accomplishments, major bug fixes, and overall impact. Delivered a critical fix to PackedFieldExtension packing logic ensuring all elements in extension slices are correctly processed, reducing risk of incorrect field packing. This work strengthens reliability for cryptographic computations and downstream verifications in Plonky3/Plonky3.