w3c-vcdm-types - SKILL.md Agent Skill

name: "w3c-vcdm-types" description: "Use when implementing type constraints in W3C VCDM. Covers: type processing and type requirements for credentials and presentations." sections: - "4.5 Types"

4.5 Types

Software systems that process the kinds of objects specified in this document use type information to determine whether or not a provided verifiable credential or verifiable presentation is appropriate for the intended use-case. This specification defines a type property for expressing object type information. This type information can be used during validation processes, as described in Appendix A. Validation.

Verifiable credentials and verifiable presentations MUST contain a type property with an associated value.

      type

The value of the type property MUST be one or more terms and absolute URL strings. If more than one value is provided, the order does not matter.

[Example 4](https://www.w3.org/TR/vc-data-model-2.0/#example-use-of-the-type-property): Use of the type 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": "z2F16goBUjRsg2ieNiojpaz313CN98DU4APFiokAUkUvEYESSDmokg1omwvcK7EFqLgYpdyekEoxnVHwuxt8Webwa"
  }
}
```**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": "u2V0AhVhAIC9hFSOtM2k0lFFuKclfp_cYTO5YWhZIYaMEPMcz1jloqTS0Zkww-Lc1U6FP15vJBaIa5ICMknDv16H8r0eh8VgjgCQDJUVkvejrCod7srzLsvKZEVUqzPULOZlb5-cwYdz0K8NYIJNls-gfevdbPuoczDW5TuctpSXJ7V9anf9MrkmJYP7ehVhARNoIdk_H3oT_8HxLP5Fo38e9blzlzSBmFswtxQUPzERVBXcgCU9k6c8pJz_RmjL0Y1eaW50Gl_qs_olK0u7NKlhAD3n7fkV5E-YF4KlodM7PhHP8_kB9you9XtTDVif3tyYsfWewmRysEN0A-EdLZ0WRwSwyJGBaBgGPb5erVUT-ElhAmLyoxIvE3GPC9rTc8tpfNEmTvcwBlpDGMlYkKb52XQeQeQFQwzgCPhpJowOomdMfPUq_xsHih8NsnDN0LXJtVFhArdqKKbPA-tMtA0mMQn1vIZ6mVjeTeJTsdxwZze2EspERwrMcgS25V-fVtjdEXCmNKyL7giUGy4eixjRGYowzpFhADobyi3ucf61IGgBM8_Vy1b8JkaiISFoy_i8ZldQfiqIoG00zU4-jEFuLWvsW7FGfPo0jq-2ZZBvS5H4SjaETJIFnL2lzc3Vlcg"
  }
}
```**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-QC823TS8NE9VGBzIFAfUt5qazGEcJ8CxeSPxFgg_vwNGMCz741AWQhjph2NJJcybTTnmtmN1AZd15PefM6BZy9pc3N1ZXI"
  }
}

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

eyJraWQiOiJFeEhrQk1XOWZtYmt2VjI2Nm1ScHVQMnNVWV9OX0VXSU4xbGFwVXpPOHJvIiwiYWxnIjoiRVMyNTYifQ .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 .yLIZkNIu3N3b2JNM69FVtAD9C5iaw7qMRc5TG6Yl8yWUu9ql9cO2sUBzNSSSz7MfqW_PMXxpbqplMKsuheroaA

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

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

  - 
    Encoded
  
  - 
    Decoded
  
  - 
    Issuer Disclosures

eyJraWQiOiJFeEhrQk1XOWZtYmt2VjI2Nm1ScHVQMnNVWV9OX0VXSU4xbGFwVXpPOHJvIiwiYWxnIjoiRVMyNTYifQ .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 .ypl46Q1EqUERV-IUUS_-qGoAESfv_WdXwtHOk2vX7QTZNFf0NNfg-w2OR8JPRe97kZBDQLuBZKPJhBXdFjbSwg ~~WyIxeDVielRkZXhsLW4zWVVIQXF5ZUxBIiwgImlkIiwgImh0dHA6Ly91bml2ZXJzaXR5LmV4YW1wbGUvY3JlZGVudGlhbHMvMzczMiJd~~WyJablVReVZXRmo0UlFfTHFmOVBkbmN3IiwgInR5cGUiLCBbIlZlcmlmaWFibGVDcmVkZW50aWFsIiwgIkV4YW1wbGVEZWdyZWVDcmVkZW50aWFsIl1d~~WyI5TG1nOHhaUVJxWEZZaVRlV0hRZjV3IiwgImlkIiwgImRpZDpleGFtcGxlOmViZmViMWY3MTJlYmM2ZjFjMjc2ZTEyZWMyMSJd~~WyJZMVBDaVA3YnJ3TjFHMEVMWmJXRlZRIiwgInR5cGUiLCAiRXhhbXBsZUJhY2hlbG9yRGVncmVlIl0~

```

{ "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": [        "DRH5ieldwG5rO2UP5yXbPWXsShQMJlDJR_fQUnhYT3E"      ]    },    "_sd": [      "S4oLjCoGMrJn2qEGiWcRM6gE4fzqUEqR34-E9gcg22Y"    ]  },  "_sd": [    "VmZqL2JJPPtD96Nlp4N7O1Q1xEFcLgXBW5_AaFAzxJo",    "Za7qFJYJtRLLR8SQOUTaLph6AcmPHiXVG96-7Zzw0KI"  ]}