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Wrapping Indy Credentials (AnonCreds) in W3C VCs
AnonCreds are typically bound to a holder by using a link secret and not by issuing a credential to a public DID. In order to add such a credential (or a subset of attributes) to the public profile, we suggest the following mechanism which expresses the intent: I self-attest that I have this credential with the specific attribute values, if you require a proof you can ask me using the Aries present proof protocol.
Given an AnonCred based on the schema M6Mbe3qx7vB4wpZF4sBRjt:2:bank_account:1.0 with attributes
we dynamically create the following VC with an inline context generated on the fly:
Further, we have thought about two different mechansism to include Indy specific information in the credential.
Custom Proof Type
Defining a custom LD proof type, e.g.
IndyCredDefProofType
that contains the credential definition ID.Custom Credential Type
Defining a custom credential type, e.g.
IndyCredential
that defines the Indy specific vocabularHandling in public profile
The Verifier verifies the JSON-LD VP proof. The individual VC contained in the VP can not be verified directly, because their origin is an AnonCred. The Verifier can request a VP (AnonCred VP) via DIDComm in case the Holder's signature is not enough and a 3rd party (Issuer) confirmation (proof) is necessary.
Example of DIDcomm Presentation Request (indy proof request)