{
 "schema": "csoai.signed-run/0.1",
 "payload": {
  "schema": "csoai.signed-artifact/0.1",
  "signer": "did:web:csoai.org#board-attestation-1 via POST /api/board-sign (pod caller token)",
  "not_a_grade": "The signature proves these bytes were signed by the board key; it does not prove any claim beyond what the source records' own instruments measured.",
  "artifact": {
   "path": "state/2026-09/numbers.json",
   "sha256": "6a9c3f05b54a4cd1a9af051aca4722ee6245ac32a7fdb46e49632b6aec11b595",
   "schema": "csoai.state-report-numbers/0.1",
   "as_of": "2026-09-26T10:34:15Z"
  },
  "page": "https://councilof.ai/state/2026-09/",
  "measurement_index_root": "85533b833d36f8a4165da34206ee6e39f7434c646c8a2c381d251391ceec366d",
  "n_numbers": 174,
  "n_sources": 28
 },
 "signature": {
  "did": "did:web:csoai.org#board-attestation-1",
  "alg": "Ed25519",
  "sig_ed25519": "64afdb83428b76433e5bb933e8e2ccac9320e5189c335eca27c61f059862feefe6ccfb82d9fc64de93b7d89452b863f4c407d50cac1ff98f8f80a10cdc47ab02",
  "payload_sha256": "79619c3adbc1d5a2ba563b1a9a923c9b2a61dc8e44c4d7a3a9a43358b14ee8b4",
  "signed_at": "2026-09-26T11:29:56.625Z"
 },
 "local_verification": {
  "result": "VERIFIES",
  "key_x": "k2fPWb6ctyu8l5at8FYgHsHFit_qoT-DssW3VNbCAXA",
  "altered_preimage_controls": {
   "trailing byte appended": "rejected (control holds)",
   "artifact sha256 altered": "rejected (control holds)",
   "signature bit flipped": "rejected (control holds)"
  }
 }
}