{
  "schema": "varexis-public-evidence-record/0.3",
  "generated_at_utc": "2026-10-29T01:09:39.613311Z",
  "record_id": "VXI-EXT-ICE05-SIGSTORE-BUNDLE-DIGEST-INPUT-01-v1",
  "record_kind": "external_reference",
  "title": "Sigstore bundle informational digest input",
  "system": "Sigstore",
  "evidence_family": "vendor_evidence_review",
  "index_status": "PUBLIC_SAFE_SOURCE_REVIEW",
  "evidence_state": "PRIMARY_DOCUMENTATION_REVIEW_ONLY",
  "canonical_question": "Can a verifier use the message digest inside a Sigstore bundle as proof of the artifact’s own digest?",
  "near_questions": [
    "Can I verify an artifact using only the digest embedded in its bundle?",
    "Where must a Sigstore verifier obtain the artifact digest?",
    "Is message_digest an authoritative artifact identity?",
    "What input is missing if I only have the bundle hash?"
  ],
  "supported_claims": [
    {
      "claim": "The Sigstore bundle specification marks message_digest as informational. A verifier must obtain or compute the digest for the artifact being verified rather than trusting that field to identify the supplied artifact.",
      "reliance": "DOCUMENTED_CAPABILITY_ONLY"
    }
  ],
  "not_demonstrated_claims": [
    "Do not substitute a self-reported bundle digest for a digest of the intended artifact. Refuse artifact identity where independently bound input is missing.",
    "Buyer implementation, live runtime enforcement, settled payment, certification or permission to act are not established.",
    "No expanded capabilities or licences for existing INDEX executables."
  ],
  "public_summary": "The Sigstore bundle specification marks message_digest as informational. A verifier must obtain or compute the digest for the artifact being verified rather than trusting that field to identify the supplied artifact.",
  "related_record_ids": [],
  "source_review": {
    "source_type": "official_external_documentation",
    "source_title": "Sigstore: Bundle specification",
    "source_url": "https://docs.sigstore.dev/about/bundle/",
    "checked_on": "2026-10-29",
    "candidate_record_id": "VXI-EXT-ICE05-SIGSTORE-BUNDLE-DIGEST-INPUT-01-v1",
    "candidate_record_sha256": "c164d87273aa84424bb6f4def02bdf5212c4f6abce0d301cea51784a4488a175",
    "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": "The Sigstore bundle specification marks message_digest as informational. A verifier must obtain or compute the digest for the artifact being verified rather than trusting that field to identify the supplied artifact.",
    "required_buyer_context": "Actual artifact bytes or independently obtained digest; Bundle; Digest algorithm; 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": "2026-10-29",
    "claim_to_check": "Can a verifier use the message digest inside a Sigstore bundle as proof of the artifact’s own digest?",
    "documented_statement": {
      "status": "documented",
      "statement": "The Sigstore bundle specification marks message_digest as informational. A verifier must obtain or compute the digest for the artifact being verified rather than trusting that field to identify the supplied artifact.",
      "source_ids": [
        "sigstore-bundle"
      ]
    },
    "review_inference": {
      "status": "review_inference",
      "statement": "Review sigstore bundle informational digest input before accepting the buyer claim. The existing bundle record distinguishes collection from verification, but does not specify the informational digest field’s role in selecting verifier input. This is a documentation-review judgment, not an observed deployment outcome.",
      "source_ids": [
        "sigstore-bundle"
      ]
    },
    "buyer_evidence_required": [
      "Actual artifact bytes or independently obtained digest",
      "Bundle",
      "Digest algorithm",
      "Verification result"
    ],
    "review_condition": {
      "status": "varexis_review_policy",
      "statement": "Do not substitute a self-reported bundle digest for a digest of the intended artifact. Refuse artifact identity where independently bound input is missing."
    },
    "unknowns": "Buyer configuration, effective authority, complete usage and final business outcomes were not inspected.",
    "unknown_finding": {
      "status": "unknown",
      "statement": "Buyer configuration, effective authority, complete usage and final business outcomes were not inspected."
    },
    "evidence_sources": [
      {
        "source_id": "sigstore-bundle",
        "url": "https://docs.sigstore.dev/about/bundle/",
        "final_url": "https://docs.sigstore.dev/about/bundle/",
        "captured_at_utc": "2026-10-29T00:50:20.783212+00:00",
        "status": 200,
        "content_type": "text/html; charset=UTF-8",
        "bytes": 71858,
        "sha256": "c603aafc93037854129c3c01efadde701c032ffc7dd4a53cd50e0d1ae2cf7ce7",
        "title": "Sigstore: Bundle specification",
        "hash_basis": "SHA-256 of captured HTTP response body bytes",
        "checked_on": "2026-10-29",
        "capture_status": 200,
        "claim_review_completed": true,
        "reviewed_sections": [
          "Message Signature",
          "DSSE"
        ],
        "version_context": "Sigstore bundle specification v0.3.2 as described by official documentation captured 2026-10-29; original response bytes and reviewed sections are pinned. Apply only the stated bundle profile.",
        "rights_review": "Original factual paraphrase and attributed source metadata only. Captured documentation and code remain private; no source prose, examples, images or vendor marks are redistributed. No licence to vendor software or buyer assurance is granted."
      }
    ],
    "observed_deployment": false,
    "commercial_reliance_boundary": "Source documentation supports only the stated boundary. Existing licensed checkers analyse supported supplied declarations; they do not query these providers, verify live systems, settle payments or certify compliance.",
    "paid_value": {
      "decision_context": "Review sigstore bundle informational digest input before accepting the buyer claim. The existing bundle record distinguishes collection from verification, but does not specify the informational digest field’s role in selecting verifier input.",
      "free": "Complete review, practical questions, source references and limitations; freely accessible and locally saveable.",
      "single_request": "Unavailable for this publication-only record; historical saved retrieval remains unchanged.",
      "evidence_receipt": "Unavailable for this publication-only record; no new paid retrieval entitlement.",
      "excluded": [
        "Fresh vendor research",
        "Live provider inspection",
        "Runtime enforcement or certification",
        "Expanded executable schemas or licences",
        "Native Coupa, Stripe Issuing, GitLab or Sigstore validation"
      ],
      "integrity": "Hashes identify content versions; they do not prove truth or provide a signature."
    },
    "revalidation": {
      "trigger": "Recheck the source and applicable API, account and configuration before current reliance. No monitoring or fresh research is included.",
      "specific_watch": "Message Signature"
    },
    "buyer_relevance": "Review sigstore bundle informational digest input before accepting the buyer claim. The existing bundle record distinguishes collection from verification, but does not specify the informational digest field’s role in selecting verifier input.",
    "refusal_conditions": [
      "Do not substitute a self-reported bundle digest for a digest of the intended artifact. Refuse artifact identity where independently bound input is missing.",
      "Do not infer buyer deployment conformance or successful business outcomes from source documentation."
    ]
  },
  "niche": {
    "niche_id": "ice05-audit",
    "label": "Audit, Provenance & Evidence Accountability",
    "classification_id": "audit",
    "classification_label": "Audit, Provenance & Evidence Accountability",
    "topic_id": "audit",
    "buyer_intent": "Review sigstore bundle informational digest input before accepting the buyer claim. The existing bundle record distinguishes collection from verification, but does not specify the informational digest field’s role in selecting verifier input.",
    "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#sigstore-bundle-digest-input",
  "machine_readable_record": "/varexis-index/records/sigstore-bundle-digest-input.json"
}