{
  "step": "C300",
  "date": "2026-09-24",
  "status": "completed",
  "title": "Limits of the cross-bridge biography extension",
  "previous_certificate_sha256": "35d7a38ccd14b7109c59e4b76cf809712a85ff2aa90e7f68bd11da1f1a3e9ec7",
  "source_manifest_sha256": "16fd74328bf0543db74db0990031082476dd5102b0db5072c742fc2adf96451e",
  "step_sha256": "2b9ab0f190437e4d42eb9822e5f062596db8e2d7e8ed99a45ac16ab848f2b4b6",
  "report_sha256": "8940c55492d9e923961b54e34927f1086b80efde20e10cb5668d785f265409b9",
  "checkpoint_sha256": "090411acbd32bd51aefc0ff26ceaa61e757aa31d5bdbad5d9b798c3492ba422b",
  "results_sha256": "62f373bd37df2a9474ba8fb62a8997dc73783404c2f09ee64894538fe3286a3b",
  "data_sha256": "b6d8ba6a20cf6655ee8dbb4dd61d6727c2452fb877eb641bc6675cbef589f772",
  "calculation_sha256": "d5cd79a22e48582eae64daaba5d80f10c089a8d8de514d99f28438846fdaa53b",
  "verifier_sha256": "1b0d77f7bd90c94c014bf13467830ac053579a4ca021d6d777d8442441f73259",
  "review_sha256": "0fbd9dab04113e486bae3605623c16bca81aa0bfc1089e5940eb3b43cce59f2d",
  "replay_sha256": "f2988cf8e58b595397f19c69c630b82636abf96d9b3528717b2c82fdc4c21eb3",
  "control_integrity_sha256": "2bdfea94e7a5937fa7dae00b92f5313fd11afcc6ddcf715ff669889d2ca47c82",
  "next_step_decision_sha256": "d1ac50a813b3b5a1b3e1d76cb0cd6e476175fe58a24b82d7d773430cb74e8c56",
  "assertions_passed": 8,
  "source_checks_passed": 9,
  "frozen_inputs": 7,
  "main_result": "The MT-only biography census yields12 labeled hits covering9 of18 endpoints; onlyNoah birth andFlood boundaries match the72 cumulative records.",
  "limits": [
    "Noah cumulative fields are derived source records, not independent new attestations.",
    "Absence is limited to the declared cumulative domain.",
    "Preserved duration alone does not identify full biographies."
  ],
  "canonical_or_graph_edits": false,
  "new_independent_agent_review": false,
  "next_proposed_step": "C301: broaden the regular endpoint side to the existing528 qualified contexts while holding all cumulative fields, bridges and anchors fixed.",
  "next_step_executed": false
}