Referencing DID-Linked Resources in VCs

Once created, issuers of Verifiable Credentials may want to reference resources within the body of issued Verifiable Credentials.

As mentioned in the section on Context for Resources, this may be useful for referencing:

• Schemas;

• Status lists;

• Trust registries;

• Visual Representations of Verifiable Credentials;

• Documents; or

• Logos

within the contents of Verifiable Credentials themselves.

IIW Example

Below is an example of a Verifiable Credential for an IIW event ticket which includes a fully qualified DID URL for the schema and logo, using resources on-ledger.

{
  "@context": [
    "https://www.w3.org/2018/credentials/v1",
    "https://veramo.io/contexts/profile/v1",
    "https://resolver.cheqd.net/1.0/identifiers/did:cheqd:testnet:z6jKUJA5YcZsNxZgsrQPKPipL2FRTf4s/resources/a20aa56a-a76f-4828-8a98-4c85d9494545"
  ],
  "type": [
    "VerifiableCredential",
    "EventReservation"
  ],
  "issuanceDate": "2022-11-17T03:19:03.328Z",
  "credentialSubject": {
    "id": "did:key:z6MkwTr46BWU42YejmZrDDCbL127dBoxSXeLuaHS75vTCg7i"
  },
  "reservationId": "4810116769",
  "reservationStatus": "https://schema.org/ReservationConfirmed",
  "reservationFor": {
    "@type": "Event",
    "name": "Internet Identity Workshop IIWXXXV",
    "startDate": "2022-11-16T16:00:00",
    "endDate": "2022-11-18T00:00:00",
    "location": "Computer History Museum, 1401 N Shoreline Blvd, Mountain View, CA 94043",
    "logo": "https://resolver.cheqd.net/1.0/identifiers/did:cheqd:testnet:z6jKUJA5YcZsNxZgsrQPKPipL2FRTf4s/resources/8140ec3a-d8bb-4f59-9784-a1cbf91a4a35"
  },
  "issuer": {
    "id": "did:cheqd:mainnet:zAXwwqZzhCZA1L77ZBa8fhVNjL9MQCHX"
  },
  "proof": {
    "type": "JwtProof2020",
    "jwt": "eyJhbGciOiJFZERTQSIsInR5cCI6IkpXVCJ9.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.U4vPbvdY7724a1jJwiDeCH_4_YC5sKUMcH6lY_XCVWBTE1RvYAnTj4fPHWMy6zSVFL9TAk4ZBOqFjKUtShBSCw"
  }
}

Dereferencing the schema

The schema in the above Credential dereferences to the following data:

{
  "@context": {
    "id": "@id",
    "type": "@type",
    "@version": 1.1,
    "schema": "http://schema.org/#",
    "xsd": "https://www.w3.org/2001/XMLSchema#",
    "reservationId": {
      "@id": "schema: reservationId",
      "@type": "xsd:string"
    },
    "reservationStatus": "schema: reservationStatus",
    "reservationFor": {
      "@id": "schema: reservationFor",
      "@type": "@id",
      "@context": {
        "name": "schema: name",
        "startDate": "schema: startDate",
        "endDate": "schema: endDate",
        "location": {
          "@id": "schema: location",
          "@type": "xsd: string"
        },
        "logo": "schema: logo"
      }
    }
  }
}