What is a Verifier?

The nChain Identity Verifier API provides a simple, privacy-focused authentication services. The Verifier's API request becomes a QR code shown to the user, and the team is currently working to support other formats, such as deep links, NFC, and Bluetooth. The user scans the QR code with their nChain Identity Wallet and shares the Verifiable Credential with the verifier.

A Verifier is an entity, individual or platform that authenticates users based on their Credentials. Verifiers create queries using users' existing Credentials from different Issuers, defining a criterion. When subjects presents a V.C to a verifier nChain Identity services provide a status check on the V.C (Valid or Expired), and a status check for the DID of the issuer and the subject.