{
  "height": 51,
  "block_hash": "3bd9da12222eca4ff8e6e5f28c98797304a5a0e4d4ed2c3242415d2360700125",
  "status": "confirmed",
  "bitcoin_block_height": 972956,
  "digest": {
    "alg": "sha256",
    "hex": "3bd9da12222eca4ff8e6e5f28c98797304a5a0e4d4ed2c3242415d2360700125",
    "preimage": "block:{\"at\":\"2026-10-24T17:46:01.977Z\",\"entry_count\":1,\"first_seq\":53,\"height\":51,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":53,\"merkle_root\":\"256feb472b756390b1d0883569a485cc8ed0820ef0666ded30ba9ac434f16b8f\",\"prev_hash\":\"48fb5abcf981eade97bf7e03b59d95f434a9fd4fc40023d231b5befe1d29c9f5\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T17:50:31.660Z",
      "updated_at": "2026-10-24T18:53:06.796Z",
      "bitcoin_block_height": 972956,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6adcefe921b56f6d8e70aac3a65a5ef70106cbd9ade681c2d7e358ab51f4f5f867cba0118be7de249e59ccbf"
        },
        {
          "type": "bitcoin",
          "block_height": 972956,
          "merkle_root": "4071a7ab56c5818aef15079b96bb02eab8d1937111f6627e87c13f5ba0e6add9"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T17:50:31.660Z",
      "updated_at": "2026-10-24T18:53:06.796Z",
      "bitcoin_block_height": 972956,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6adcefe9f09b916e45230688476db1fdc5e6f559f719ba30a1bb6ad46adbd89358d9a0fbcc55baf5b1014cad"
        },
        {
          "type": "bitcoin",
          "block_height": 972956,
          "merkle_root": "4071a7ab56c5818aef15079b96bb02eab8d1937111f6627e87c13f5ba0e6add9"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "confirmed",
      "submitted_at": "2026-10-24T17:50:31.660Z",
      "updated_at": "2026-10-24T18:53:06.796Z",
      "bitcoin_block_height": 972959,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6adcefe9a23a3807cd73fa0eda052bb530d41227b7b46edd7498e88111a2cde00e7c5a74b900ea6f0f2364bc"
        },
        {
          "type": "bitcoin",
          "block_height": 972959,
          "merkle_root": "b24f80d7cd4c29a7c0218013b1bbb0a729ae2ef53b720f465ca9c5b104743f66"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/51/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."
}