Dan Firth developed and integrated SHA512 and SHA3-512 hashing support into the IntersectMBO/cardano-base repository, enhancing the cardano-crypto-class module to align with evolving security requirements. He approached the task by updating the Haskell codebase, modifying Cabal project configurations, and ensuring comprehensive test coverage through cardano-crypto-tests. This work expanded the cryptographic primitives available to downstream Cardano components, supporting future protocol changes and strengthening the overall security posture. Dan’s contributions demonstrated expertise in Haskell, cryptography, and test-driven development, with careful attention to documentation and release preparation, resulting in a robust, production-ready feature addition without introducing new bugs.