w3c-vcdm-identifiers-types

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Use when working with identifiers and types in W3C VCDM. Covers: identifier modeling rules and URI usage across credentials and presentations.

sourcelabbg By sourcelabbg schedule Updated 3/7/2026
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name: "w3c-vcdm-identifiers-types" description: "Use when working with identifiers and types in W3C VCDM. Covers: identifier modeling rules and URI usage across credentials and presentations." sections: - "4.4 Identifiers"

4.4 Identifiers

When expressing statements about a specific thing, such as a person, product, or organization, using a globally unique identifier for that thing can be useful. Globally unique identifiers enable others to express statements about the same thing. This specification defines the optional id property for such identifiers. The id property allows for expressing statements about specific things in the verifiable credential and is set by an issuer when expressing objects in a verifiable credential or a holder when expressing objects in a verifiable presentation. The id property expresses an identifier that others are expected to use when expressing statements about the specific thing identified by that identifier. Example id values include UUIDs (urn:uuid:0c07c1ce-57cb-41af-bef2-1b932b986873), HTTP URLs (https://id.example/things#123), and DIDs (did:example:1234abcd).

    Note: Identifiers of any kind increase correlatability

Developers are reminded that identifiers might be harmful when pseudonymity is required. When considering such scenarios, developers are encouraged to read Section 8.4 Identifier-Based Correlation carefully There are also other types of access and correlation mechanisms documented in Section 8. Privacy Considerations that create privacy concerns. Where privacy is a vital consideration, it is permissible to omit the id property. Some use cases do not need or explicitly need to omit, the id property. Similarly, special attention is to be given to the choice between publicly resolvable URLs and other forms of identifiers. Publicly resolvable URLs can facilitate ease of verification and interoperability, yet they might also inadvertently grant access to potentially sensitive information if not used judiciously.

      id

The id property is OPTIONAL. If present, id property's value MUST be a single URL, which MAY be dereferenceable. It is RECOMMENDED that the URL in the id be one which, if dereferenceable, results in a document containing machine-readable information about the id.

[Example 3](https://www.w3.org/TR/vc-data-model-2.0/#example-use-of-the-id-property): Use of the id property

  - Credential- ecdsa- ecdsa-sd- bbs- jose- cose- sd-jwt```

{ "@context": [ "https://www.w3.org/ns/credentials/v2", "https://www.w3.org/ns/credentials/examples/v2" ], "id": "http://university.example/credentials/3732", "type": ["VerifiableCredential", "ExampleDegreeCredential"], "issuer": "https://university.example/issuers/565049", "validFrom": "2010-01-01T00:00:00Z", "credentialSubject": { "id": "did:example:ebfeb1f712ebc6f1c276e12ec21", "degree": { "type": "ExampleBachelorDegree", "name": "Bachelor of Science and Arts" } } }

            ```
{
  "@context": [
    "https://www.w3.org/ns/credentials/v2",
    "https://www.w3.org/ns/credentials/examples/v2"
  ],
  "id": "http://university.example/credentials/3732",
  "type": [
    "VerifiableCredential",
    "ExampleDegreeCredential"
  ],
  "issuer": "https://university.example/issuers/565049",
  "validFrom": "2010-01-01T00:00:00Z",
  "credentialSubject": {
    "id": "did:example:ebfeb1f712ebc6f1c276e12ec21",
    "degree": {
      "type": "ExampleBachelorDegree",
      "name": "Bachelor of Science and Arts"
    }
  },
  "proof": {
    "type": "DataIntegrityProof",
    "created": "2025-04-27T17:58:33Z",
    "verificationMethod": "did:key:zDnaebSRtPnW6YCpxAhR5JPxJqt9UunCsBPhLEtUokUvp87nQ",
    "cryptosuite": "ecdsa-rdfc-2019",
    "proofPurpose": "assertionMethod",
    "proofValue": "z5WHRyhjLd2H5RFcSqW3bss39zFBvVrVuXUovBpbGX2ATL8vSxwoeoiZFb1eibsdjRQK5GS1nr76RZRKBj7iH9roE"
  }
}
```**application/vc**
            ```
{
  "@context": [
    "https://www.w3.org/ns/credentials/v2",
    "https://www.w3.org/ns/credentials/examples/v2"
  ],
  "id": "http://university.example/credentials/3732",
  "type": [
    "VerifiableCredential",
    "ExampleDegreeCredential"
  ],
  "issuer": "https://university.example/issuers/565049",
  "validFrom": "2010-01-01T00:00:00Z",
  "credentialSubject": {
    "id": "did:example:ebfeb1f712ebc6f1c276e12ec21",
    "degree": {
      "type": "ExampleBachelorDegree",
      "name": "Bachelor of Science and Arts"
    }
  },
  "proof": {
    "type": "DataIntegrityProof",
    "created": "2025-04-27T17:58:33Z",
    "verificationMethod": "did:key:zDnaerJh8WwyBVVGcZKKkqRKK9iezje8ut6t9bnNChtxcWwNv",
    "cryptosuite": "ecdsa-sd-2023",
    "proofPurpose": "assertionMethod",
    "proofValue": "u2V0AhVhAfojGD02jMuCezr87Ra8dvWa9ruscwcjDo2jYpvNEzxQthrKO3csDTuvk2A278uD7Cot6fgfm4YXddQ3eKnF91VgjgCQCpvhiT83vvn-T-PFVSUfoo51-s11TfQ39hmlIC61wy2hYINWUMbNH3sN80JcCKn-4fcaBDpSGT7KgsL07bUWUlHrJhVhAG4V_V2OV_xGWDfKU1CH_D53kF5Hy8RBi4S0551TkpUKvouKF5s5a-b1qDh2iNK1RXQyF6vdhbt4Kjo0RfnSYplhAvBoxWd2Xmpe8ERCoO3qs3el64rEmsYuPOgMyQTacrl2tuFLs3ui23JdtCnOSxmcRzVC27r4HIpubjSug4NE261hAcb7bwdJUpxP6Bqp7hiD8O_nFIMxLdzErfU522ZVy4CqLOiEERGMT2jFlgDcxlpkk5ZrMJOl9QfQSLPtjolWIy1hAbOzFKnJtBhSu3lfzmSftTWl1-FLtWu3Lt7ePxpGPbMjr6DVfS3sZL8E6M4uETdce15BsDkThGi_1ZjJ7YG9GLFhADav02TPSZdSV73AqOyZ6ryfuz3Y7pKKuu67dnqNzzXS-H-8-39I1rA759bba_lkqeo8F0lPtT_3liNamnCd-CoFnL2lzc3Vlcg"
  }
}
```**application/vc**
            ```
{
  "@context": [
    "https://www.w3.org/ns/credentials/v2",
    "https://www.w3.org/ns/credentials/examples/v2"
  ],
  "id": "http://university.example/credentials/3732",
  "type": [
    "VerifiableCredential",
    "ExampleDegreeCredential"
  ],
  "issuer": "https://university.example/issuers/565049",
  "validFrom": "2010-01-01T00:00:00Z",
  "credentialSubject": {
    "id": "did:example:ebfeb1f712ebc6f1c276e12ec21",
    "degree": {
      "type": "ExampleBachelorDegree",
      "name": "Bachelor of Science and Arts"
    }
  },
  "proof": {
    "type": "DataIntegrityProof",
    "verificationMethod": "did:key:zUC78GzFRA4TWh2mqRiKro1wwRb5KDaMJ3M1AD3qGtgEbFrwWGvWbnCzArkeTZCyzBz4Panr2hLaZxsXHiBQCwBc3fRPH6xY4u5v8ZAd3dPW1aw89Rra86CVwXr3DczANggYbMD",
    "cryptosuite": "bbs-2023",
    "proofPurpose": "assertionMethod",
    "proofValue": "u2V0ChVhQkkdBby2GbmvVh66cM6TNzNfh0hR9ePeG7dWYbHfDxK6CcA_rVoxxsRGIoWX5Gs6ZGgQNPTBeehiEHT_cj-5fjZ6ArTluARHPbaXQzWyXKrVYQGd_DaMQQsoaryttl5TvxnFT-Vm4SkVx03K9qNJ4jhArS1r7HKFDPyyrvPGqNF8bjgNELvoomOjpbD9JEvaGI1pYYJVTGbTfcflzyx41E-f9kSqmf10xYzxJrGfC7b7GPY8X7VjMT__ZKSuwdH-5jak-5gkjocsHI6oxIKlLrhW1Wh5yrDCH-QC823TS8NE9VGBzIFAfUt5qazGEcJ8CxeSPxFgg1LgUmXHTRjMrLAeoNgJipw-F81uEwauN0JK-WcohpmWBZy9pc3N1ZXI"
  }
}

Protected Headers

{
  "kid": "ExHkBMW9fmbkvV266mRpuP2sUY_N_EWIN1lapUzO8ro",
  "alg": "ES256"
}

application/vc

{
  "@context": [
    "https://www.w3.org/ns/credentials/v2",
    "https://www.w3.org/ns/credentials/examples/v2"
  ],
  "id": "http://university.example/credentials/3732",
  "type": [
    "VerifiableCredential",
    "ExampleDegreeCredential"
  ],
  "issuer": "https://university.example/issuers/565049",
  "validFrom": "2010-01-01T00:00:00Z",
  "credentialSubject": {
    "id": "did:example:ebfeb1f712ebc6f1c276e12ec21",
    "degree": {
      "type": "ExampleBachelorDegree",
      "name": "Bachelor of Science and Arts"
    }
  }
}

application/vc+jwt

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application/vc

{
  "@context": [
    "https://www.w3.org/ns/credentials/v2",
    "https://www.w3.org/ns/credentials/examples/v2"
  ],
  "id": "http://university.example/credentials/3732",
  "type": [
    "VerifiableCredential",
    "ExampleDegreeCredential"
  ],
  "issuer": "https://university.example/issuers/565049",
  "validFrom": "2010-01-01T00:00:00Z",
  "credentialSubject": {
    "id": "did:example:ebfeb1f712ebc6f1c276e12ec21",
    "degree": {
      "type": "ExampleBachelorDegree",
      "name": "Bachelor of Science and Arts"
    }
  }
}

application/vc+cose

d28443a10128a05901be7b2240636f6e74657874223a5b2268747470733a2f2f7777772e77332e6f72672f6e732f63726564656e7469616c732f7632222c2268747470733a2f2f7777772e77332e6f72672f6e732f63726564656e7469616c732f6578616d706c65732f7632225d2c226964223a22687474703a2f2f756e69766572736974792e6578616d706c652f63726564656e7469616c732f33373332222c2274797065223a5b2256657269666961626c6543726564656e7469616c222c224578616d706c6544656772656543726564656e7469616c225d2c22697373756572223a2268747470733a2f2f756e69766572736974792e6578616d706c652f697373756572732f353635303439222c2276616c696446726f6d223a22323031302d30312d30315430303a30303a30305a222c2263726564656e7469616c5375626a656374223a7b226964223a226469643a6578616d706c653a656266656231663731326562633666316332373665313265633231222c22646567726565223a7b2274797065223a224578616d706c6542616368656c6f72446567726565222c226e616d65223a2242616368656c6f72206f6620536369656e636520616e642041727473227d7d7d584013d7bfd4a7f3c0296d67f24157e4ba5a5fedafc688c5e01bd72f23e1d419d558ec05cddf9ac477fdc9fc7a8b1325dc80968a1bbc95d2c601753693290cbff553

  - 
    Encoded
  
  - 
    Decoded
  
  - 
    Issuer Disclosures

eyJraWQiOiJFeEhrQk1XOWZtYmt2VjI2Nm1ScHVQMnNVWV9OX0VXSU4xbGFwVXpPOHJvIiwiYWxnIjoiRVMyNTYifQ .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 .YASiTse77TXvt7jYyChZOd6x0TbbBeEVZ14pekiOWw6G6N40a3evbWFBAkuPcStVFZPshFy1GFECySRVAhcD5A WyIzQkdhQ3BfaTZIV0hEMm5GekZ2blN3IiwgImlkIiwgImh0dHA6Ly91bml2ZXJzaXR5LmV4YW1wbGUvY3JlZGVudGlhbHMvMzczMiJdWyJld1p0bUpDZHA2VWFWcEVhTXZ0V0FRIiwgInR5cGUiLCBbIlZlcmlmaWFibGVDcmVkZW50aWFsIiwgIkV4YW1wbGVEZWdyZWVDcmVkZW50aWFsIl1dWyJIdThleHpqLTBySDg0aEtwenhnS0VnIiwgImlkIiwgImRpZDpleGFtcGxlOmViZmViMWY3MTJlYmM2ZjFjMjc2ZTEyZWMyMSJdWyJVczR2ekVuVWJuSU96OC1VVDd2OHN3IiwgInR5cGUiLCAiRXhhbXBsZUJhY2hlbG9yRGVncmVlIl0~

  ```

{  "kid": "ExHkBMW9fmbkvV266mRpuP2sUY_N_EWIN1lapUzO8ro",  "alg": "ES256"}

      ```
{  "iat": 1745776713,  "exp": 1746986313,  "_sd_alg": "sha-256",  "@context": [    "https://www.w3.org/ns/credentials/v2",    "https://www.w3.org/ns/credentials/examples/v2"  ],  "issuer": "https://university.example/issuers/565049",  "validFrom": "2010-01-01T00:00:00Z",  "credentialSubject": {    "degree": {      "name": "Bachelor of Science and Arts",      "_sd": [        "al4ZGw1zYleMA106Izb-XesJAnWCgSi5nPn1JEV1jj8"      ]    },    "_sd": [      "8-oYOESRk60imZ3nX3ca9DlHyqIq98Ft3__G1AlaOt0"    ]  },  "_sd": [    "ODPcUXCWld-HiqCXy4HncS1oxjiDiDOp12xbUoxFoSc",    "UhkFmL7qw4QYKX2cT3LXP0p6yTw5RiHDnqXl_0VKfxA"  ]}
Install via CLI
npx skills add https://github.com/sourcelabbg/eudi-knowledge --skill w3c-vcdm-identifiers-types
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