payload library

Classes

Artifact: Deterministic identification of the object whose production is in question.
Assessment: Opaque at the task layer. The task standardizes the interaction, not the receipt.
Disclosed: Only the categories the request asked for.
DisclosedAnchorsItem: DisclosedAnchorsItem, generated from its schema.
DisclosedDocument: DisclosedDocument, generated from its schema.
DisclosedIntegrity: DisclosedIntegrity, generated from its schema.
DisclosedTimeline: DisclosedTimeline, generated from its schema.
Payload: What a Verifier asks of a Holder: identify an artifact by digest, supply a freshness challenge, and name the disclosure categories wanted. The outer document members (id, type, issuer, recipient, issuedAt, expiresAt, proof) are owned by the framework — SPEC §6.3.

ArtifactAlgorithm: Carried verbatim from the IANA Named Information Hash Algorithm registry, not re-cased — SPEC §4.10 externally-owned values.
DisclosedAnchorsItemKind: DisclosedAnchorsItemKind is a closed set of string values defined by this specification's schema.
DisclosedIntegrityKeyCustody: DisclosedIntegrityKeyCustody is a closed set of string values defined by this specification's schema.
DisclosureCategory: Derived aggregates only. An enum rather than a pattern so a primitive cannot widen its own disclosure surface by inventing a name. The determination itself is not a category: it is always in assessment when the result is attested. Raw behavioral samples and fingerprints are out of scope for 0.1.

payloadSchemaJson → const String: This specification's payload schema, as JSON text.
responsePayloadSchemaJson → const String: As payloadSchemaJson, for the success-response variant.
responseSpec → const SpecPolicy: The SPEC §7.2 policy for the success-response variant.
responseTypeUri → const String: The success-response form of typeUri (SPEC §4.4.1).
spec → const SpecPolicy: The SPEC §7.2 policy for the request variant, taken from this specification's front matter.
typeUri → const String: The Trust Task type URI this library's Payload is carried under.

Ext = Map<String, dynamic>: Vendor-namespaced extension object per SPEC.md §4.5.1. Each immediate key MUST be a reverse-DNS namespace; structure under each namespace is opaque to the framework.
ReceiptReference = Object?: Tagged union. Inline exists for Verifiers that cannot dereference a URI at verification time.
Response = Object?: The Holder's answer. Failures use trust-task-error, not this shape. Both results share one response type so the envelope carries no observable distinction between them. result is the discriminator and stays inside the payload, so one envelope type covers both branches.