Joris Zierold developed vault-based key management for the euler-xyz/euler-labels repository, introducing per-asset vaults for xBTC.b and InfiniFi. He designed a modular keyring architecture in TypeScript, enabling secure isolation of cryptographic keys for each asset and reducing cross-asset risk. By integrating vault-based key management systems and focusing on asset-specific custody, Joris laid the foundation for scalable asset support and improved regulatory alignment. His work demonstrated strong full stack development and secure coding practices, with disciplined Git workflows. The resulting system supports faster onboarding of new assets and positions the project for future expansion of asset vault capabilities.