In March 2025, Marc Kostrzewa delivered formal verification enhancements for the Lightprotocol/light-protocol repository, focusing on updated cryptographic circuits and core protocol operations. He applied formal verification techniques using Lean and Go to refactor and extend verification logic around Merkle trees and hashing, improving both coverage and maintainability. This work strengthened the protocol’s security and correctness, reducing the risk of cryptographic defects and supporting safer on-chain deployments. By aligning verification processes with established security standards, Marc’s contributions addressed the need for robust, trustworthy cryptographic operations, demonstrating depth in cryptography, formal verification engineering, and zero-knowledge proof systems within a production codebase.