[OAUTH-WG] OAuth Digital Credential Status Attestations

[Orie Steele <[e-mail]>]

Hello Digital Credential Enthusiasts,

See:
https://peppelinux.github.io/draft-demarco-status-attestations/draft-demarco-status-attestations.html

Note the use of the term digital credential, and the alignment to CWT based
credentials and CWT based credential status lists.

As a quick summary of the editors draft above:

It is basically a refresh-token-like approach to dynamic state, where the
holder retrieves updated state from the issuer at regular intervals, and
can then present that dynamic state directly to the verifier.

This eliminates the herd privacy and phone home issues associated with W3C
Bitstring Status Lists.

And it informs the holder of dynamic state, so the digital wallet can
provide a better user experience.

However, an issuer (government or ngo) could use the interval of requesting
dynamic state, to track the holder... so the guidance from
https://datatracker.ietf.org/doc/draft-steele-spice-oblivious-credential-state/

Is also relevant to this draft.

I also learned that
https://datatracker.ietf.org/doc/draft-ietf-oauth-sd-jwt-vc/

Has defined a new property for expressing "Verifiable Credential" "type"
`vct`, which is different from how W3C defines credential types.

W3C uses the expanded IRI for the graph node type, based on the JSON-LD
context.

For example with:

{
  "@context": [
    "https://www.w3.org/ns/credentials/v2",
    "https://www.w3.org/ns/credentials/examples/v2"
  ],
  "id": "http://university.example/credentials/1872",
  "type": ["VerifiableCredential", "ExampleAlumniCredential"],
  ...
}

The credential type in RDF becomes "
https://www.w3.org/ns/credentials/examples#ExampleAlumniCredential"

Which is different from "ExampleAlumniCredential" in JSON... More evidence
that RDF leads to developer confusion regarding safe typing.

The OAuth solution does not have this confusing issue, they set the type
explicitly:

{
 "vct": "https://credentials.example.com/identity_credential",
 "given_name": "John",
 "family_name": "Doe",
 "email": "[e-mail]",
 "phone_number": "[phone]",
 "address": {
   "street_address": "123 Main St",
   "locality": "Anytown",
   "region": "Anystate",
   "country": "US"
 },
 "birthdate": "1940-01-01",
 "is_over_18": true,
 "is_over_21": true,
 "is_over_65": true,
 "status": {
    "status_attestation": {
        "credential_hash_alg": "S256",
    }
 }
}

Regards,

OS

-- 


ORIE STEELE
Chief Technology Officer
www.transmute.industries

<https://transmute.industries>