{
  "schema": "varexis-public-evidence-record/0.3",
  "generated_at_utc": "2026-10-06T23:09:49Z",
  "record_id": "VXI-EXT-SIGSTORE-02-v1",
  "record_kind": "external_reference",
  "title": "Sigstore: Signing transparency",
  "system": "Sigstore",
  "evidence_family": "software_supply_chain",
  "index_status": "PUBLIC_SAFE_SOURCE_REVIEW",
  "evidence_state": "PRIMARY_DOCUMENTATION_REVIEW_ONLY",
  "canonical_question": "What does a Rekor transparency entry establish?",
  "near_questions": [
    "What does Rekor record about a signing event?",
    "Does inclusion in a transparency log approve software?",
    "Can a buyer audit use of a signing identity?",
    "Which evidence supports a signing-transparency claim?",
    "How should a receipt distinguish logging from approval?",
    "Does a log entry prove the artifact is harmless?",
    "What is needed to match a log entry to an artifact?",
    "Can an agent trust a supplied log reference without verification?",
    "Does public signing evidence establish content correctness?",
    "How does transparency contribute to later review?",
    "What context is needed for a Rekor evidence check?",
    "Which record explains the limits of signing logs?"
  ],
  "supported_claims": [
    {
      "claim": "Sigstore describes Rekor as a public, append-only record of signing information. Log evidence supports auditability; it does not by itself approve the artifact's contents.",
      "reliance": "DOCUMENTED_CAPABILITY_ONLY"
    }
  ],
  "not_demonstrated_claims": [
    "artifact safety from log presence",
    "endorsement by the log operator",
    "correctness of a signed claim"
  ],
  "public_summary": "Sigstore describes Rekor as a public, append-only record of signing information. Log evidence supports auditability; it does not by itself approve the artifact's contents.",
  "related_record_ids": [
    "VXI-EXT-SLSA-12-PROV-01-v1",
    "VXI-EXT-SLSA-12-TRACK-01-v1",
    "VXI-EXT-SLSA-12-03-v1",
    "VXI-EXT-SIGSTORE-01-v1",
    "VXI-EXT-SIGSTORE-03-v1",
    "VXI-EXT-SIGSTORE-BUNDLE-01-v1"
  ],
  "source_review": {
    "source_type": "official_external_documentation",
    "source_title": "Sigstore documentation",
    "source_url": "https://docs.sigstore.dev/",
    "checked_on": "2026-10-07",
    "candidate_record_id": "VXI-EXT-SIGSTORE-02-v1",
    "candidate_record_sha256": "582d126b54f86969b68bd434568b141dfed010c36b17dd78fc0f5fd4ae8fc94b",
    "method": "Primary documentation reviewed for the published bounded statement.",
    "deployment_tested_by_varexis": false,
    "revalidation": "Recheck the primary source, version and deployment context before paid delivery."
  },
  "answer_policy": {
    "classification": "DOCUMENTED_WITH_DEPLOYMENT_BOUNDARY",
    "bounded_answer": "Sigstore describes Rekor as a public, append-only record of signing information. Log evidence supports auditability; it does not by itself approve the artifact's contents.",
    "required_buyer_context": "Artifact digest, signing material, log evidence and expected identity.",
    "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.",
  "paid_access_note": "The public answer and boundaries are free. Pay first, then email a concrete question for asynchronous manual review, receipt or scoped export. No fixed turnaround or automatic API access is promised.",
  "service_route": {
    "request_guide": "/varexis-index/request.html",
    "request_workflow": "/varexis-index/request-workflow.json",
    "service_id": "evidence_receipt",
    "service_routes_url": "/varexis-index/service-routes.json",
    "payment_required": true,
    "accepting_paid_requests": true,
    "operational_status": "PAID_ASYNC_MANUAL_FULFILMENT",
    "checkout_url": "https://buy.stripe.com/28EaEXaPe7bBdGLgXSdwc05"
  },
  "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-transparency-log",
  "machine_readable_record": "/varexis-index/records/sigstore-transparency-log.json"
}