{
  "height": 57,
  "block_hash": "57b2b5ef096431cb0b6aef3823360fde45976b963c60df43427c0a59eb826b2d",
  "status": "confirmed",
  "bitcoin_block_height": 972961,
  "digest": {
    "alg": "sha256",
    "hex": "57b2b5ef096431cb0b6aef3823360fde45976b963c60df43427c0a59eb826b2d",
    "preimage": "block:{\"at\":\"2026-10-24T18:16:02.107Z\",\"entry_count\":1,\"first_seq\":59,\"height\":57,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":59,\"merkle_root\":\"d03f7a184ed802e4625c06cb2e254223ad5e1fd67319adcb8e647de24a18ccc0\",\"prev_hash\":\"c61e742269f8bff5f144a31cc26448105cdd4769de529f6385211e7b5a421b23\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T18:20:31.663Z",
      "updated_at": "2026-10-24T20:11:18.860Z",
      "bitcoin_block_height": 972961,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6adcf6f1c397557f3d32cb93d9cde1c20f9ff937229007b199d57af30040e498adbc0df8f5754dc8130bdd70"
        },
        {
          "type": "bitcoin",
          "block_height": 972961,
          "merkle_root": "b3457e6ad05eaeb5789bc2108e2879baa6811cef788def10eb23534d66875ea3"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T18:20:31.663Z",
      "updated_at": "2026-10-24T20:11:18.860Z",
      "bitcoin_block_height": 972961,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6adcf6f1b60075596c01128eefed517e686c8641cf917cfc887f827b8eb09c41021b64e19959cf1ad3fe7a9c"
        },
        {
          "type": "bitcoin",
          "block_height": 972961,
          "merkle_root": "b3457e6ad05eaeb5789bc2108e2879baa6811cef788def10eb23534d66875ea3"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "confirmed",
      "submitted_at": "2026-10-24T18:20:31.663Z",
      "updated_at": "2026-10-25T02:49:17.524Z",
      "bitcoin_block_height": 972999,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6adcf6f10542c8b4bc93c35d29b301e6c1e2bf88987bad1af480268a068ff63c7a74239fe4fb74d4db96fdc4"
        },
        {
          "type": "bitcoin",
          "block_height": 972999,
          "merkle_root": "ae0e717f0d642956016a8572888d23fb045efcac654b542c5ac908707f3b5590"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/57/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."
}