Worked on enhancing biometric authentication flows in the near/near-api-js repository by improving Ed25519 key handling for passkey-derived keys. Addressed a key management edge case by introducing an 'ed25519:' prefix and developing a makeEd25519KeyString helper, ensuring consistent formatting and parsing of keys throughout the codebase. Updated all relevant call sites to adopt the new prefixed format and implemented a regression test to verify correct parsing, thereby increasing reliability and security. The work focused on cryptography and key management, utilizing TypeScript and JavaScript, and emphasized robust unit testing to align with evolving passkey-based authentication standards.