Worked on enhancing package source integrity within the ocaml/opam-repository by migrating checksum verification from MD5 to SHA-256, addressing modern security standards for package management. Focused on cryptographic best practices, the work involved updating verification logic and refreshing the layoutz package checksum to ensure authenticity and strengthen supply-chain security. Leveraged OCaml and version control tools to implement these changes, prioritizing release engineering and the trustworthiness of distributed packages. No major bugs were addressed during this period, as the primary objective centered on improving authentication mechanisms and release integrity for the repository’s package sources through robust, security-focused engineering practices.