Portkey is a AA wallet in aelf's ecosystem, facilitating the migration of users, developers, and projects from Web2 to Web3 through a DID solution. Users can log in swiftly using Web2 social info, without private keys or mnemonics. Portkey employs social recovery and a decentralized guardian design to secure assets from centralized control and theft. It features a payment delegation mechanism allowing interested parties to act as delegates and cover user activity fees. This enables free account creation and potential coverage of other usage fees within Portkey.