Worked on enhancing sysvar hash reliability across the firedancer-io/firedancer and firedancer-io/test-vectors repositories, focusing on improving data integrity and on-chain validation. Addressed two critical bugs by introducing a new data fixture to resolve slot hash mismatches and correcting slot identification logic within the runtime system. This approach ensured that fixture data and runtime logic remained aligned, reducing validation noise and strengthening end-to-end correctness. Utilized C for system programming and debugging, with an emphasis on fixture management and test vector maintenance. The work improved test coverage and enabled more reliable system variable hashing in production environments.