June 2026 monthly summary for starkware-libs/stwo-cairo focused on delivering a robust Merkle verifier, improving correctness, performance, and maintainability. Features delivered include sorting and deduplication of query positions in the Merkle verifier, addition of end-to-end tests to validate robustness when traces exceed preprocessed size and when query positions are unsorted, and a code refactor to rename bounce_adds to add_routine for clearer naming.

2026-04 monthly summary for starkware-libs/stwo-cairo: Delivered a feature refinement in coset evaluation by refactoring fold_coset to optimize processing and by introducing x-coordinate handling for coset domains. This enhances throughput and strengthens correctness in coset computations. No customer-reported bugs fixed this month; instead we mitigated latent correctness risks and improved maintainability through clearer domain handling.

March 2026 monthly summary for starkware-libs/stwo-cairo focusing on the delivery of configurable FRI fold steps and Merkle verification optimizations, with strong test coverage and measurable impact on verification scalability.

Month: 2025-08 | Repository: starkware-libs/stwo | In this period, delivered a critical fix that improves cryptographic hashing reliability in Poseidon-based channel operations. The Poseidon252Channel length padding fix ensures the last element includes the original data length via padding, strengthening data integrity for the Poseidon mix_u32s function and reducing the risk of incorrect hashes in channel computations. The change reinforces correctness, security, and trust in cryptographic primitives used by the library.