{
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  "generated_at_utc": "2026-10-24T23:11:13.073Z",
  "record_id": "VXI-EXT-PROCUREMENT-DSSE-KEYID-UNTRUSTED-SELECTION-HINT-01-v1",
  "record_kind": "external_reference",
  "title": "DSSE key identifiers and trusted signers",
  "system": "DSSE v1.0.2",
  "evidence_family": "vendor_evidence_review",
  "index_status": "PUBLIC_SAFE_SOURCE_REVIEW",
  "evidence_state": "PRIMARY_DOCUMENTATION_REVIEW_ONLY",
  "canonical_question": "Can a DSSE keyid be used as authenticated evidence of the signer or signature algorithm?",
  "near_questions": [
    "Is DSSE keyid covered by the signature?",
    "Can DSSE keyid choose an arbitrary trusted signing algorithm?",
    "Which evidence identifies the trusted key that verified a DSSE signature?",
    "Does matching a DSSE key identifier establish signer authority?"
  ],
  "supported_claims": [
    {
      "claim": "DSSE 1.0.2 defines KEYID as an optional unauthenticated hint. It may narrow the set of keys to try but must not be used for security decisions. Verification instead checks the signature with acceptable trusted keys under cryptographic details agreed out of band. A matching keyid string therefore does not establish a trusted signer or algorithm.",
      "reliance": "DOCUMENTED_CAPABILITY_ONLY"
    }
  ],
  "not_demonstrated_claims": [
    "The actual trust store and key ownership were not verified.",
    "No verified business outcome, complete event capture, deployment certification or authority to act.",
    "Buyer deployment testing, live runtime enforcement, certification or permission to act",
    "Expanded capabilities or licences for existing INDEX executables"
  ],
  "public_summary": "DSSE 1.0.2 defines KEYID as an optional unauthenticated hint. It may narrow the set of keys to try but must not be used for security decisions. Verification instead checks the signature with acceptable trusted keys under cryptographic details agreed out of band. A matching keyid string therefore does not establish a trusted signer or algorithm.",
  "related_record_ids": [],
  "source_review": {
    "source_type": "official_external_documentation",
    "source_title": "DSSE v1.0.2 — protocol",
    "source_url": "https://raw.githubusercontent.com/secure-systems-lab/dsse/b531b787bb3e5f0c3e1c19cee84da1c5d569b061/protocol.md",
    "checked_on": "2026-10-24",
    "candidate_record_id": "VXI-EXT-PROCUREMENT-DSSE-KEYID-UNTRUSTED-SELECTION-HINT-01-v1",
    "candidate_record_sha256": "3f9b1e3988ab98ac7e47c16951811b4513e993b4e7b082c48e23a2e0be1072dc",
    "method": "Primary documentation reviewed for the published bounded statement.",
    "deployment_tested_by_varexis": false,
    "revalidation": "The delivered snapshot preserves the review date shown. Recheck current primary documentation and deployment context before relying on present applicability; payment does not trigger fresh research."
  },
  "answer_policy": {
    "classification": "DOCUMENTED_WITH_DEPLOYMENT_BOUNDARY",
    "bounded_answer": "DSSE 1.0.2 defines KEYID as an optional unauthenticated hint. It may narrow the set of keys to try but must not be used for security decisions. Verification instead checks the signature with acceptable trusted keys under cryptographic details agreed out of band. A matching keyid string therefore does not establish a trusted signer or algorithm.",
    "required_buyer_context": "Accepted key set and provenance; Agreed signature algorithm and key-selection policy; Actual signature verification result. Buyer deployment not inspected.",
    "missing_evidence": "A broader claim needs evidence matching the intended use. Payment does not upgrade the evidence state."
  },
  "private_boundary": "Raw logs, thresholds, private paths, source code, protected mechanisms and reconstruction-level details are excluded from public and paid delivery.",
  "decision_profile": {
    "schema": "varexis-vendor-evidence-review/1",
    "review_status": "documentation_review_only",
    "checked_on": "2026-10-24",
    "claim_to_check": "Can a DSSE keyid be used as authenticated evidence of the signer or signature algorithm?",
    "documented_statement": {
      "status": "documented",
      "statement": "DSSE 1.0.2 defines KEYID as an optional unauthenticated hint. It may narrow the set of keys to try but must not be used for security decisions. Verification instead checks the signature with acceptable trusted keys under cryptographic details agreed out of band. A matching keyid string therefore does not establish a trusted signer or algorithm.",
      "source_ids": [
        "dsse-protocol"
      ]
    },
    "review_inference": {
      "status": "review_inference",
      "statement": "Select trusted verification keys independently of the envelope hint. This is a review judgment, not an observed execution or deployment result.",
      "source_ids": [
        "dsse-protocol"
      ]
    },
    "buyer_evidence_required": [
      "Accepted key set and provenance",
      "Agreed signature algorithm and key-selection policy",
      "Actual signature verification result"
    ],
    "review_condition": {
      "status": "varexis_review_policy",
      "statement": "Refuse signer or algorithm trust derived only from keyid."
    },
    "unknowns": "The actual trust store and key ownership were not verified.",
    "unknown_finding": {
      "status": "unknown",
      "statement": "The actual trust store and key ownership were not verified."
    },
    "evidence_sources": [
      {
        "source_id": "dsse-protocol",
        "url": "https://raw.githubusercontent.com/secure-systems-lab/dsse/b531b787bb3e5f0c3e1c19cee84da1c5d569b061/protocol.md",
        "final_url": "https://raw.githubusercontent.com/secure-systems-lab/dsse/b531b787bb3e5f0c3e1c19cee84da1c5d569b061/protocol.md",
        "status": 200,
        "captured_at_utc": "2026-10-24T22:53:31.659Z",
        "sha256": "6c0d965475162230f9f461acf634b4d4b409eab1a1839d31a9c24c76b3676253",
        "bytes": 6638,
        "title": "DSSE v1.0.2 — protocol",
        "hash_basis": "Decoded HTTP response body bytes",
        "rights_review": "Original bounded paraphrase; source bodies are captured privately and not redistributed. Repository Apache-2.0 licence reviewed.",
        "checked_on": "2026-10-24",
        "capture_status": 200,
        "claim_review_completed": true,
        "reviewed_sections": [
          "Signature Definition: KEYID; verification protocol",
          "PAYLOAD_TYPE; signature definition; verification rejection",
          "Verification protocol; envelope security considerations"
        ],
        "version_context": "DSSE protocol/envelope v1.0.2 (2024-05-10), pinned revision; pinned secure-systems-lab/dsse revision b531b787bb3e5f0c3e1c19cee84da1c5d569b061. Source documentation is not independent evidence of buyer deployment behaviour."
      }
    ],
    "observed_deployment": false,
    "commercial_reliance_boundary": "Documentation review only; the buyer must establish applicability and actual outcomes. INDEX does not inspect or control the deployment.",
    "paid_value": {
      "decision_context": "Select trusted verification keys independently of the envelope hint.",
      "free": "Complete review, sources, practical questions and limitations; may be saved locally.",
      "single_request": "Existing server-saved version-bound route snapshot for later authenticated retrieval.",
      "evidence_receipt": "The same snapshot plus the existing unsigned delivery receipt.",
      "excluded": [
        "Fresh vendor research",
        "Continuous monitoring or change alerts",
        "Testing the buyer configuration",
        "Private evidence or vendor certification"
      ],
      "integrity": "Hashes identify content versions; they do not prove truth or provide a signature."
    },
    "revalidation": {
      "trigger": "A saved purchase does not recheck the source or buyer configuration.",
      "specific_watch": "Recheck the pinned source, deployed version, selection policy and retained operation results before relying on a current outcome."
    },
    "buyer_relevance": "Select trusted verification keys independently of the envelope hint.",
    "refusal_conditions": [
      "Refuse signer or algorithm trust derived only from keyid."
    ]
  },
  "niche": {
    "niche_id": "agent-authority-action-evidence",
    "label": "Agent Authority & Action Evidence",
    "classification_id": "audit",
    "classification_label": "Audit, Provenance & Evidence Accountability",
    "topic_id": "audit",
    "buyer_intent": "Select trusted verification keys independently of the envelope hint.",
    "comparison_role": "supplementary_discovery"
  },
  "paid_access_note": "The full published answer and boundaries are free. Paid access saves the selected route and source versions, with an unsigned receipt when purchased. Preview coverage before paying. Fresh research, bespoke assessment and protected evidence are excluded.",
  "service_route": {
    "request_guide": "/varexis-index/request.html",
    "request_workflow": "/varexis-index/request-workflow.json",
    "service_id": "single_request",
    "service_routes_url": "/varexis-index/service-routes.json",
    "payment_required": true,
    "availability_endpoint": "/api/index/capabilities",
    "operational_status": "AUTOMATIC_SERVICE_CAPABILITIES_GATED",
    "checkout_url": "/index-access"
  },
  "authority_boundary": "VAREXIS-INDEX informs evidence reliance. It does not provide advice, certification, deployment authority, security assurance, production approval, or guarantee.",
  "human_page": "/varexis-index/catalog.html#dsse-keyid-untrusted-selection-hint",
  "machine_readable_record": "/varexis-index/records/dsse-keyid-untrusted-selection-hint.json"
}