(registered 2026-09-22, last updated 2026-09-22)

Media type name: application

Media subtype name: vnd.nnu.profile+json

Required parameters: N/A

Optional parameters: N/A

Encoding considerations: binary

Security considerations: The representation is declarative JSON and contains no active or executable content. RFC 8259 Section 12 applies. Implementations must treat text and URLs as untrusted, escape rendered text, bound resource consumption, and apply SSRF, redirect, content-size, and remote-context protections before dereferencing URLs. The format itself provides no confidentiality, integrity, authentication, authorization, freshness, non-repudiation, or legal-identity proof. HTTPS protects origin authentication and transit integrity; durable or offline assertions require an additional signature or credential mechanism. A public manifest must not contain secrets or private identifiers and must not be the sole basis for high-risk authorization. See Section 8 of https://nnu.us/specifications/nnu-profile-manifest-1.0.txt

Interoperability considerations: JSON object member order is insignificant. The representation is UTF-8 JSON without a BOM. Revisions are base-10 integer strings, timestamps are RFC 3339 values with offsets, and URLs are canonical public authority-form HTTPS URLs. Consumers must inspect schema_version and must not interpret unsupported versions as version 1. See Sections 2, 7, and 9 of the published specification.

Published specification: https://nnu.us/specifications/nnu-profile-manifest-1.0.txt
JSON Schema: https://nnu.us/specifications/nnu-profile-manifest-1.0.schema.json

Applications which use this media: nnu.us servers, AI agent clients, identity discovery clients, browser extensions, and SDKs that consume public nnu.us Profile manifests.

Fragment identifier considerations: No subtype-specific fragment identifier syntax is defined. The fragment identifier considerations for the +json structured syntax suffix apply.

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: The fixed representation is available at https://nnu.us/@{handle}.profile.json and the canonical Profile URL supports HTTP content negotiation with Accept: application/vnd.nnu.profile+json. This registration is requested in the vendor tree and is not represented as complete until IANA publishes it.

Person to contact for further information:

1. Name: Binbin Shen, Grid Heap, Inc.
2. Email: contact&gridheap.com

Intended usage: COMMON

Author/Change controller: Grid Heap, Inc. <contact&gridheap.com>