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The following table defines how issued Credential MUST be returned in the credential claim in the Credential Response based on the Credential format and the signature scheme. This specification does not require any additional encoding when Credential format is already represented as a JSON object or a JSON string.
| Credential Signature Format | Credential Format Identifier | Signature Scheme | Need for encoding when returning in the Credential Response |
|---|---|---|---|
| JWS Compact Serialization | jwt_vc, mdl_iso_json, mid_iso_json |
Credential conformant to the W3C Verifiable Credentials Data Model, ISO/IEC 18013-5:2021 mobile driving licence (mDL) data model, or ISO/IEC 23220-4 mobile eID document data model (not yet published), and signed as a JWS Compact Serialization. | MUST be a JSON string. Credential is already a sequence of base64url-encoded values separated by period characters and MUST NOT be re-encoded. |
| JWS JSON Serialization | jwt_vc, mdl_iso_json, mid_iso_cbor |
Credential conformant to the W3C Verifiable Credentials Data Model, ISO/IEC 18013-5:2021 mobile driving licence (mDL) data model, or ISO/IEC 23220-4 mobile eID document data model (not yet published), and signed as a JWS JSON Serialization. | MUST be a JSON object. MUST NOT be re-encoded. |
| Data Integrity | ldp_vc |
Credential conformant to the W3C Verifiable Credentials Data Model and signed with Data Integrity Proofs. | MUST be a JSON object. MUST NOT be re-encoded. |
| CL-Signatures | ac_vc |
Credential conformant to the AnonCreds format as defined in the Hyperledger Indy project and signed using CL-signature scheme. | MUST be a JSON object. MUST NOT be re-encoded. |
| COSE | mdl_iso_cbor |
Credential conformant to the ISO/IEC 18013-5:2021 mobile driving licence (mDL) data model, encoded as CBOR and signed as a COSE message. | MUST be a JSON string that is the base64url-encoded representation of the issued Credential |
Note that this table might be superceded by a registry in the future. Meanwhile, for interoperability, implementers MUST follow the requirements defined in the table above.
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