{
  "ObservationEnvelope": {
    "fields": [
      "observation_id",
      "source_id",
      "source_type",
      "content",
      "observed_at",
      "source_provenance",
      "content_type",
      "received_at",
      "valid_from",
      "valid_until",
      "origin",
      "issuer",
      "chain_of_custody",
      "integrity_status",
      "authenticity_status",
      "freshness_status",
      "epistemic_status",
      "confidence",
      "corroboration_state",
      "conflict_state",
      "trust_domain",
      "authorization_scope",
      "sensitivity",
      "simulation_status",
      "evidence_class",
      "parent_observation",
      "supersedes"
    ],
    "canonical": true
  },
  "SourceAttestation": {
    "fields": [
      "source_id",
      "source_type",
      "identity_status",
      "passport_digest",
      "trust_domain",
      "integrity_status",
      "authority",
      "provenance"
    ],
    "canonical": true
  },
  "EvidenceObject": {
    "fields": [
      "evidence_id",
      "observation_ids",
      "source_ids",
      "content_digest",
      "provenance_root",
      "integrity_proof",
      "created_at",
      "epistemic_status",
      "temporal_validity",
      "corroboration_score",
      "conflict_set",
      "confidence",
      "authorization_relevance",
      "decision_targets",
      "expires_at",
      "superseded_by",
      "evidence_class"
    ],
    "canonical": true
  },
  "EvidenceIntegrity": {
    "fields": [
      "content_digest",
      "integrity",
      "authenticity",
      "provenance",
      "semantic_correctness",
      "media_type"
    ],
    "canonical": true
  },
  "ModelAssertion": {
    "fields": [
      "assertion_id",
      "model_id",
      "agent_id",
      "trajectory_id",
      "input_evidence_ids",
      "generation_timestamp",
      "model_runtime_digest",
      "confidence",
      "reasoning_artifact_reference",
      "evidence_class",
      "authority",
      "is_external_fact"
    ],
    "canonical": true
  },
  "IntentEvidenceBinding": {
    "fields": [
      "intent_id",
      "evidence_ids",
      "material",
      "evidence_root"
    ],
    "canonical": true
  }
}