Syntax

Fide ID Shape: did:fide:0x{entityType}{referenceType}{referenceFingerprint}

MUST be exactly 51 characters long.

The method-specific-id MUST be 0x{entityType}{referenceType}{referenceFingerprint}.

Valid Entity Type and Reference Type codes, and entity-specific constraints on their use, are defined by the Fide Vocabulary.

Normative Dependencies

This specification is normative for identifier syntax and validation mechanics.
Fide Vocabulary is normative for valid entity types, valid reference types, and allowed entity-type/reference-type combinations.

Prefix

Declares that the identifier is a DID using the Fide method namespace.

MUST start with did:fide:0x in compliance with DID.

Entity Type

Defines what kind of entity is being identified.

MUST use a valid 2-character hexadecimal Fide Entity Type Code.

Reference Type

Defines what kind of Reference Identifier the identifier is derived from.

MUST use a valid 2-character hexadecimal Fide Reference Type Code.

Reference Fingerprint

Defines the fingerprint the Reference Identifier is derived from.

MUST derive by UTF-8 encoding the Reference Identifier, hashing it with SHA-256, and using the first 36 hexadecimal characters.

Reference Identifier

Defines the identifier value used as the reference input.

MUST be a string identifier.
MUST match the declared Reference Type.
SHOULD uniquely identify the declared Entity Type when interpreted with the declared Reference Type.

Avoid Ambiguous References

If a public identifier could validly refer to multiple distinct entities you may want to model separately, it SHOULD NOT be reused for all of them. Use a more specific public identifier when available, or define a declared or derived entity when you need a more precise referent than the public identifier can uniquely provide.

Multiple Valid Fide IDs

A single Fide ID SHOULD identify one entity, but a single entity can still have multiple valid Fide IDs when it can be identified by multiple valid Reference Identifiers.