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146 lines (146 loc) · 6.44 KB
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{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"$id": "https://spec.c2pa.org/specifications/specifications/2.3/specs/C2PA_Specification.html",
"title": "Soft Binding Algorithm List",
"description": "Authoritative list of soft binding algorithms to be used by C2PA implementations for the purpose of recovering C2PA Manifests via soft bindings",
"examples": [
[
{
"identifier": 1,
"alg": "com.example.watermark.alg1",
"type": "watermark",
"decodedMediaTypes": [
"image"
],
"entryMetadata": {
"description": "Example watermarking algorithm",
"categories": [
"org.example.watermarking"
],
"dateEntered": "2025-01-01T00:00:00Z",
"contact": "contact@example.com",
"informationalUrl": "https://example.com/softbinding/alg1"
},
"softBindingResolutionApis": [
"https://resolver.example.com/alg1"
]
}
]
],
"type": "array",
"items": {
"type": "object",
"properties": {
"identifier": {
"type": "integer",
"minimum": 0,
"maximum": 65535,
"description": "This identifier will be assigned when the soft binding algorithm is added to the list"
},
"deprecated": {
"type": "boolean",
"default": false,
"description": "Indicates whether this soft binding algorithm is deprecated. Deprecated algorithms shall not be used for creating soft bindings. Deprecated algorithms may be used for resolving soft bindings but this behaviour is discouraged"
},
"alg": {
"type": "string",
"pattern": "^[A-Za-z]{2,63}(?:\\.[A-Za-z0-9](?:[A-Za-z0-9-]*[A-Za-z0-9])?)+\\.?$",
"description": "Entity-specific namespace as specified for C2PA Assertions labels that shall begin with the Internet domain name for the entity similar to how Java packages are defined (e.g., `com.example.algo1`, `net.example.algos.algo2`)"
},
"type": {
"enum": [
"watermark",
"fingerprint"
],
"description": "Type of soft binding implemented by this algorithm"
},
"decodedMediaTypes": {
"type": "array",
"minItems": 1,
"items": {
"enum": [
"application",
"audio",
"image",
"model",
"text",
"video"
],
"description": "IANA top level media type (rendered) for which this soft binding algorithm applies"
}
},
"encodedMediaTypes": {
"type": "array",
"minItems": 1,
"items": {
"type": "string",
"description": "IANA media type for which this soft binding algorithm applies, e.g., application/pdf",
"pattern": "^([a-zA-Z0-9\\-]+\\/[a-zA-Z0-9\\-\\+]+(?:\\.[a-zA-Z0-9\\-\\+]+)*)$"
}
},
"entryMetadata": {
"type": "object",
"properties": {
"description": {
"type": "string",
"description": "Human readable description of the algorithm"
},
"categories": {
"type": "array",
"description": "This allows specifying values that can be used to cluster this algorithm with others of the same or similar values. For example an algorithm that is used in a certain context (e.g., verified news, advertising). The format of these categories follows the entity-specific namespace as specified for C2PA Assertions labels that shall begin with the (reversed) Internet domain name for the entity similar to how Java packages are defined (e.g., `org.iptc.watermarking`, `net.example.cluster.context1`)",
"items": {
"type": "string",
"pattern": "^[A-Za-z]{2,63}(?:\\.[A-Za-z0-9](?:[A-Za-z0-9-]*[A-Za-z0-9])?)+\\.?$"
}
},
"dateEntered": {
"type": "string",
"format": "date-time",
"description": "Date of entry for this algorithm"
},
"contact": {
"type": "string",
"format": "email"
},
"informationalUrl": {
"type": "string",
"format": "uri",
"description": "A web page containing more details about the algorithm"
}
},
"required": [
"description",
"dateEntered",
"contact",
"informationalUrl"
]
},
"softBindingResolutionApis": {
"type": "array",
"items": {
"type": "string",
"format": "uri"
},
"description": "A list of Soft Binding Resolution APIs supporting this algorithm. The referenced APIs shall comply with the standard Soft Binding Resolution API for C2PA Manifest Recovery (see https://spec.c2pa.org/specifications/specifications/2.3/softbinding/Decoupled.html#SBR-API) or with the C2PA Federated Lookup standard smart contract interface (see https://spec.c2pa.org/specifications/specifications/2.3/softbinding/Decoupled.html#_federated_lookup)"
}
},
"required": [
"identifier",
"alg",
"type",
"entryMetadata"
],
"anyOf": [
{
"required": [
"decodedMediaTypes"
]
},
{
"required": [
"encodedMediaTypes"
]
}
]
}
}