Kian An Lim developed a Blockdaemon Signing API and key management feature for the hyperledger-labs/splice-wallet-kernel repository, focusing on expanding wallet interoperability and security. He implemented a new signing driver using TypeScript and backend development skills, enabling the kernel to sign transactions, manage cryptographic keys, and retrieve transaction statuses without exposing private keys. This approach streamlined the signing workflow by integrating external provider-based signing, reducing manual steps and operational friction for users. The work demonstrated depth in API development and backend integration, positioning the wallet kernel for future multi-provider signing support while maintaining a strong emphasis on secure key management practices.