(registered 2025-04-18, last updated 2025-04-18)

Media type name: application

Media subtype name: cid

Required parameters: N/A

Optional parameters: N/A

Encoding considerations: binary

Resources that use the application/cid media type are required to conform to all of the requirements for the application/json media type and are therefore subject to the same encoding considerations specified in Section 11 of The JavaScript Object Notation (JSON) Data Interchange Format [RFC7159].

Security considerations: As defined in Section 5. Security Considerations in the Controlled Identifiers v1.0 specification <https://www.w3.org/TR/2025/PR-cid-1.0-20250320>.

Interoperability considerations: As described in The JavaScript Object Notation (JSON) Data Interchange Format [RFC7159]

Published specification: https://www.w3.org/TR/2025/PR-cid-1.0-20250320/#controller-media-type

Applications which use this media: Applications using W3C Verifiable Credentials use this media type. Also, applications using W3C Decentralized Identifiers (DIDs) use this media type.

Fragment identifier considerations: As defined in Section 3.4 Fragment Resolution in the Controlled Identifiers v1.0 specification <https://www.w3.org/TR/2025/PR-cid-1.0-20250320>.

Restrictions on usage: N/A

Additional information:

1. Deprecated alias names for this type: N/A
2. Magic number(s): N/A
3. File extension(s): N/A
4. Macintosh file type code: N/A
5. Object Identifiers: N/A

General Comments: Registration is being requested under the terms of the W3C liaison agreement with the IETF https://www.w3.org/guide/editor/mediatypes.html

Person to contact for further information:

1. Name: Michael B Jones
2. Email: michael_b_jones&hotmail.com

Intended usage: COMMON

Author/Change controller: W3C Verifiable Credentials Working Group public-vc-wg&w3.org