{
  "height": 76,
  "block_hash": "4c7e982cc8aa6aa5ecc866354e009f23e8d9de8b880e9b9680d6e54dbbd2380b",
  "status": "confirmed",
  "bitcoin_block_height": 974880,
  "digest": {
    "alg": "sha256",
    "hex": "4c7e982cc8aa6aa5ecc866354e009f23e8d9de8b880e9b9680d6e54dbbd2380b",
    "preimage": "block:{\"at\":\"2026-11-07T02:14:15.244Z\",\"entry_count\":2,\"first_seq\":172,\"height\":76,\"key_id\":\"key_a521921c2ba20669\",\"last_seq\":173,\"merkle_root\":\"435872d5aa90ea05b16d11b644870344921d86e2ba6be199d4e008c27b2903a9\",\"prev_hash\":\"c6e1d46395278236eefd3e57c88aca734c5b379de152660fdaf94515e4ddbd89\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-11-07T02:18:43.465Z",
      "updated_at": "2026-11-07T04:18:43.479Z",
      "bitcoin_block_height": 974880,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6aee8a866b85a5f36b1b254e41e3a941c631415b981199dc3a904e31edb05bd8ecd7a6234c7bb3af1f1f43ec"
        },
        {
          "type": "bitcoin",
          "block_height": 974880,
          "merkle_root": "e20917e92c25ba0bebbc60b5b7fe48f0ee84f05c3eb4987c3107d249f2c7113d"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-11-07T02:18:43.465Z",
      "updated_at": "2026-11-07T04:18:43.479Z",
      "bitcoin_block_height": 974883,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6aee8a864270c3eb663caeb72ff0b9c4196cb0a1b012332707a96c458ee0a9b01139f43f5ca5e96ca6a24bb6"
        },
        {
          "type": "bitcoin",
          "block_height": 974883,
          "merkle_root": "79abb9dd33baad0a1ff37045cc779f6fe1b133a7037999fbd2c996ad78e43b90"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "pending",
      "submitted_at": "2026-11-07T02:18:43.465Z",
      "updated_at": "2026-11-07T02:18:43.465Z",
      "bitcoin_block_height": null,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6aee8a86af0ea954861116bd35b3a238337429f28a6fe5d8fd7595deb1663e7cfc5056a6bda2502ecc1c4edc"
        }
      ]
    }
  ],
  "proof_url": "https://www.a2ally.com/v1/ledger/blocks/76/anchor.ots",
  "how_to_verify": "Download the .ots proof and run `ots verify -d <block_hash> <file>.ots` with the OpenTimestamps client, which checks the Bitcoin attestation against Bitcoin block headers. The digest is the block hash: sha256 of digest.preimage, the text \"block:\" followed by the canonical block header, which is the same header the issuer signs."
}