{
  "step": "C340",
  "status": "completed",
  "date": "2026-09-24",
  "title": "Noah death refinement of the double-E ladder",
  "previous_certificate_sha256": "bef1fbd945f89c5b42471ecf15c71b8ace873ae9559935bf073df3e63a84817d",
  "bindings": {
    "step": "STEP.json",
    "source_manifest": "SOURCE_MANIFEST.json",
    "report": "490d_C340_Noah_Death_Refinement_of_Double_E_Ladder_20260924.md",
    "checkpoint": "490d_Mirror_Checkpoint_After_C340_20260924.md",
    "data": "evidence/DATA.json",
    "results": "evidence/RESULTS.json",
    "calculation": "evidence/CALCULATION.py",
    "verifier": "evidence/check.py",
    "next_step_decision": "NEXT_STEP_DECISION.json",
    "replay": "REPLAY.json",
    "control_integrity": "CONTROL_INTEGRITY.json",
    "readme": "README.md"
  },
  "step_sha256": "3dddcc2cd085c9a0e866c5fbaa1d45df00a7dfaf45b5cef7a98eadc971bff13c",
  "source_manifest_sha256": "6bfd7dff44cb25ef13543bb917c6ba417e484466056bba9cff8e5140684d7a4d",
  "report_sha256": "f361001513732d8e08b842b2e384ff251d00624bc2c3d30c73e9116ed3a03363",
  "checkpoint_sha256": "64397686464bf8e088fa184c2d370a908f29d9bff466421033d600e2f6769c27",
  "data_sha256": "eadfd90e67b97a688250fdfa7dff13d7c36ee4b1647437acef5ecb5ae85f24aa",
  "results_sha256": "8ace5a6535ebd625549cf23c7362167992be7daa332d483a6773c177dd175573",
  "calculation_sha256": "6b0d44bb3d5feade0a924554ea792b03f8687979653f36acadf9f5eb61d7226c",
  "verifier_sha256": "9f175670abb70f7819dd7f6d997ff0bef2e58df8dffd763b433f6c6cd62e332d",
  "next_step_decision_sha256": "71fcca0b9fd0ca877994814e06c35924686c5127f8c6728d43da6ca50f5b47a5",
  "replay_sha256": "3efcdb4212f6aa0054ffbd0cc55768e4146be5eb7a4234991ac7713c87b7a32e",
  "control_integrity_sha256": "9810807cb07b02f43f568f68bb82cb41a6eeff6799902254b4932e5c350ac838",
  "readme_sha256": "dddb5c6ec1a019b12ad656ee4f72d7b953708b4eac9d33c616109d7e490ee043",
  "assertions_passed": 36,
  "source_checks_passed": 17,
  "main_result": "Primary source chain460+490+108+92+100 gives1058=950+108,1150=950+200,1250=950+300. Actual companion chain459+491+108+91+101 and named502/98 chain460+490+108+94+98 retain the1058/1250 endpoints but alter the interior.",
  "limits": "Five existing comparison chains only. Equal durations and their refinements are dependent source arithmetic, not independent witnesses or a prescribed global map.",
  "canonical_or_graph_edits": false,
  "new_independent_agent_review": false,
  "review_provenance": "Root-agent analysis and deterministic replay; no new independent-agent review",
  "next_proposed_step": "Verify the exact phase and map conditions for the Noah-held duration ladder: use only existing quarter-year components, test mismatched-component controls, and determine whether one affine map can preserve the source Noah lifespan or both seasonal Noah components.",
  "next_step_executed": false
}