Sebastien Van Eyck developed foundational hardware wallet support for OneKey within the MetaMask/core repository, introducing a dedicated keyring type that enables standalone device recognition and distinct account management. By architecting a modular integration pattern, Sebastien separated OneKey from Trezor in the account list, improving user clarity and security. The implementation leveraged full stack development skills with a focus on Node.js and TypeScript, emphasizing robust key management practices. This work established a scalable framework for future hardware wallet integrations, demonstrating depth in both technical design and execution, and addressed the need for clearer device distinction and enhanced hardware wallet ecosystem support.