Where they overlap: Like a passkey, your UIID sign-in is passwordless, device-bound and biometric-secured. Sign-in uses WebAuthn, with the credential anchored in your device's hardware security module. There is no password stored anywhere for anyone to steal.
Where they differ: A passkey proves you control a device. It does not say anything about who you are, and you still hold a separate account at every service. A UIID is an identity you own outright — one Core ID, unlimited aliases, and verifiable credentials such as badges that travel with you across every Web4 application.
How it differs from social login: With "Sign in with Google" or "Sign in with Facebook", the identity provider sees every service you sign in to. With UIID, everyday sign-ins run through anonymous aliases, so services cannot cross-reference your behaviour across the internet — and neither can we.
What it is built on: Decentralized Identifiers (DIDs) and Verifiable Credentials, both W3C standards, rather than proprietary alternatives.
Not a blockchain: No wallet, no ledger, no gas fees, no tokens.
Try it: uiid.me