March 2026 focused on delivering core SIEVE IR capabilities, improving API clarity, and strengthening maintainability for rapid future iteration. Key work includes building the SIEVE IR API crates and static parser, integrating with Schmivitz for dynamic recomputation of additions to boost performance, and expanding documentation to reflect the new libraries.

February 2026 monthly summary for GaloisInc/zk-lean focused on delivering cryptographic proof reliability, generalization for scalable lookups, and code quality improvements across the SHA3/Keccak circuit suite. The work strengthened security guarantees, improved maintainability, and demonstrated a range of formal verification and functional programming techniques relevant to zero-knowledge proof systems.

January 2026 performance summary for GaloisInc/zk-lean: Delivered a production-grade SHA3-256 core in Lean4 and established ZK-friendly SHA3 circuit foundations. The work emphasizes cryptographic reliability, formal safety, and performance, enabling verifiable hashing in zk-enabled protocols and downstream systems.

December 2025 (2025-12) – GaloisInc/zk-lean: Key features delivered this month include the introduction of ZK Monad Transformers to improve handling of state and options in ZK operations, comprehensive code cleanup to enhance readability, and an upgrade to the latest mathlib for compatibility and new features. Specifics: ZK Monad Transformers Integration modernizes the computation flow within the ZK framework (commit 80076d5a6851633a6512cb2ed5f81ecaea061a0e). Code cleanup and readability improvements for the ZK framework and RAM/ZKBuilder state management included replacing pattern matches with split in theorem definitions and removing unused RAM operations, contributing to clearer code paths and reduced cognitive load (commits 138c714b0416943cc977c1397bbdc76b74c22877 and e486f2408a5a0704e8541e44dfa01071f5d3ac59). Mathlib dependency upgraded to 4.25.0 to improve compatibility and access to newer features (commit b115ae713e924c908d274938517d73011308302a).

November 2025 monthly summary for GaloisInc/zk-lean focusing on delivering robust ZKLean semantics and strengthening formal guarantees of zero-knowledge circuits. Key outcomes include a semantic overhaul for expression evaluation and RAM modeling, introduction of pure evaluation, improved witness handling, and a streamlined path to faster, more reliable circuit construction. Determinism, soundness, and completeness infrastructure was advanced to provide verifiable, repeatable circuit behavior, addressing regressions and establishing foundations for proofs. Code quality improvements and refactoring increased maintainability, testability, and performance, enabling more dependable deployments.

July 2025 monthly summary for GaloisInc/zk-lean: Focused on stabilizing the theorem development workflow by introducing a temporary placeholder around the ConstrainEq3Trivial theorem to unblock debugging and ongoing work. This included commenting out prior unfolding/simplification steps and preserving historical context by recording the old ConstrainEq2Trivial path for reference. The changes are non-user-facing but crucial for iterative development and risk reduction in the proof pipeline. No new user-facing features were released this month; instead, the emphasis was on maintainability, traceability, and faster iteration cycles to support future feature work.

June 2025 monthly summary for GaloisInc/zk-lean. Key feature delivered: Zero-knowledge XOR Subtable Enhancements with bit-vector mapping and XOR evaluation. No major bugs fixed this month. Impact: enhances correctness and expressiveness of the zk subtable, enabling more reliable zk proofs and smoother future optimizations. Technologies/skills demonstrated: Lean lemma development, bit-vector modeling, zk-context reasoning, commit-based traceability; improved maintainability of the zk-lean codebase.

May 2025 summary for GaloisInc/zk-lean: delivered three major improvements to the constraint engine and developer experience. 1) Transitive equality constraints strengthened via compositional construction of constrainEq3Transitive using Triple.and, increasing robustness and maintainability. 2) ZKLean builder and formalism refactor for cleaner code, removal of dead code, reorganization, added documentation, and RAM-related usability helpers to improve developer productivity. 3) ZKExpr and semantics refactor to remove the Eq constructor, replace checks with constrainEq, add safe indexing, and simplify semantics evaluation for correctness and clarity. These changes reduce maintenance risk, clarify semantics, and set the groundwork for faster feature delivery.

April 2025 monthly summary for GaloisInc/zk-lean focused on delivering measurable value in zero-knowledge tooling, formal verification, and build reproducibility. The work consolidated memory modeling, proof orchestration, and modular library integration to enhance circuit reliability, traceability, and performance.

March 2025 monthly summary for GaloisInc/zk-lean: Delivered foundational capabilities for a robust ZK circuit builder and performance-oriented zk computations. Established ZK Circuit Builder foundations including groundwork for R1CS, Jolt extraction, circuit definitions, and theorem-based verification, enabling reliable, verifiable zk-circuit construction. Introduced a RAM API to model and operate in-memory data efficiently within zk-lean, improving performance and scalability. Completed dependency stabilization via a mathlib version update to ensure compatibility and reduce risk. Generated early collaboration artifacts for ZK circuit builder monad abstractions with Joachim and proven work (e.g., Example theorem 1) in collaboration with Benoit, setting the stage for production-grade zk workflows.

February 2025 — Build stabilization for zk-lean: fixed critical build blockers and improved CI reliability, enabling faster iteration and safer downstream development.

January 2025: Established the ZK Lean framework foundation and opened a scalable path for Lean-based zk proofs. Key scaffolding delivered, including a Lean project bootstrap, core ZK API (variables, builders, constraints), and lookup table support, alongside an API refactor to a more flexible AST. Fixed a critical boolean logic issue in MLE-based equality and related subtable computations to ensure correct ZK circuit behavior. This work provides a robust base for future feature development, improved correctness, and faster iteration.