{
  "_meta": {
    "contract": "cry01-ots",
    "version": "1.0",
    "purpose": "OpenTimestamps proof envelope anchoring a diagnostic result to the Bitcoin blockchain."
  },
  "_header": {
    "document_hash": "SHA-256 hash of the document being timestamped.",
    "hash_algorithm": "sha256",
    "timestamped_at": "ISO 8601 timestamp of OTS submission to calendar server.",
    "calendar_url": "The OTS calendar server used.",
    "addon": "The addon that generated this document (cry01, poll01, etc.)",
    "association_slug": "The association this document pertains to."
  },
  "_payload": {
    "ots_proof_base64": "Base64-encoded .ots proof file. Verifiable offline with the ots tool.",
    "bitcoin_block": "Bitcoin block number in which the timestamp was confirmed. Null until confirmed.",
    "confirmed_at": "ISO 8601 timestamp of Bitcoin confirmation. Null until confirmed."
  }
}