{
  "step": "C280",
  "date": "2026-09-24",
  "status": "completed",
  "title": "The second realization of the598 triangle",
  "previous_certificate_sha256": "6cbeecf989d74ff799dd152125b7b364030b4fc11aa6c51e443b1fda6e8f0547",
  "source_manifest_sha256": "7f721ef15874ad7a6992d2c22755d588742395c9860910e7d47cf607c0ae5f89",
  "step_sha256": "c483d7f6e0be9287796c772b68b57fd960e1569618da08248bee49827168e868",
  "report_sha256": "30a61f9b12cafe811eb96951a6c32e49ae1bbfb498bc8ae0dc9509c6eeae7d9a",
  "checkpoint_sha256": "6fd2a46c4f4e2bdcbd4e7887169ee895d8e7f853fd582eaa5f8194731c306300",
  "results_sha256": "3dfc8ed1dd16114f1849d4bbdb658af12ed97d25555e614430cd6b938b26fa90",
  "data_sha256": "ff87152703f86db98e7ffb504c4b2106d997d6af61757d906d041211bc2156c2",
  "calculation_sha256": "6437678a781d6ad74ff1b93194c4b9d0442b9679449b6e6d8f455435930f5a78",
  "verifier_sha256": "1b0d77f7bd90c94c014bf13467830ac053579a4ca021d6d777d8442441f73259",
  "review_sha256": "7732094d643d167af17c937ab936bf827c598d316aa7286f79137842a46e15e9",
  "replay_sha256": "c375ef0764368d1d7a1a50cf013e6f12a0015066040a27a5b6392bb326c64155",
  "control_integrity_sha256": "2bdfea94e7a5937fa7dae00b92f5313fd11afcc6ddcf715ff669889d2ca47c82",
  "next_step_decision_sha256": "85f743b3a60a6ebfa63874811d521a8f7176bfb36444122c385767784b1092d8",
  "assertions_passed": 37,
  "source_checks_passed": 9,
  "frozen_inputs": 7,
  "main_result": "All six598/8395/8993 triangles persist under the documented LXX ON / MT ON+60 state comparison.",
  "limits": [
    "Equal460 magnitudes have different source operations.",
    "Flood-only covariance does not supply MT Noah companions.",
    "Preserving local images would require a separately stated intercept adjustment."
  ],
  "canonical_or_graph_edits": false,
  "new_independent_agent_review": false,
  "next_proposed_step": "C281: test which Noah600 rectangles and598/602 crosspairs survive in the MT ON+60 realization without importing SP companions.",
  "next_step_executed": false
}