VC Data Model Example

[quartzjer]

Placeholder to track adding a full example of a JPT using the VC Data Model into the draft.

[Sakurann]

Because JWP payloads are only contain claims, would the body of JWT-VC be equivalent to the Header of a JWP-VC?

Sample Header of JWP-VC?:

{
  "iss": "did:example:1234", //VC's issuer
  "sub": "did:example:5678", //user
  "nbf": 1541493724,
  "exp": 1573029723,
  "jti": "http://example.com/credentials/2022",
  "nonce": 660!6345FSer,
  "vc": {                    //omitting @context for now
    "type": ["VerifiableCredential", "BasicCredential"],
  },  
  "claims": [                //need to clarify relationship between vc.credentialSubject and JWP header `claims`?
    "family_name",
    "given_name",
    "email",
    "age"
  ],
  "typ": "JPT",
  "alg": "BBS-X"
}

[quartzjer]

The example header would look more like:

{
  "iss": "did:example:1234",
  "vc": { 
    "type": ["VerifiableCredential", "BasicCredential"],
  },  
  "claims": [
    "sub",
    "nbf",
    "exp",
    "jti",
    "family_name",
    "given_name",
    "email",
    "age"
  ],
  "typ": "JPT",
  "alg": "BBS-X"
}

The header can only contain parameters/values that are a constant, if they are unique they become something that can be correlated. All per-issuance values MUST be in a payload so that they can be selectively disclosed and unlinkable (when supported by the JPA).

[dwaite]

For draft 5: add comparable example based on current SD-JWT work, e.g. https://drafts.oauth.net/oauth-selective-disclosure-jwt/draft-ietf-oauth-selective-disclosure-jwt.html#name-example-4a-sd-jwt-based-ver