{
  "height": 52,
  "block_hash": "1a5b72a6596215186920e224990bd3e068414a28cf34f0ba933f0c36ee41ed85",
  "status": "confirmed",
  "bitcoin_block_height": 972956,
  "digest": {
    "alg": "sha256",
    "hex": "1a5b72a6596215186920e224990bd3e068414a28cf34f0ba933f0c36ee41ed85",
    "preimage": "block:{\"at\":\"2026-10-24T17:51:01.995Z\",\"entry_count\":1,\"first_seq\":54,\"height\":52,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":54,\"merkle_root\":\"53905770dce208922dae5ee70712bf095498498cec8893565e49c0070c2f2fef\",\"prev_hash\":\"3bd9da12222eca4ff8e6e5f28c98797304a5a0e4d4ed2c3242415d2360700125\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T18:00:31.661Z",
      "updated_at": "2026-10-24T19:03:06.797Z",
      "bitcoin_block_height": 972956,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6adcf240c3608a7fed833d9a629fa957daedb63cb43c8c8f90e2149751f3ddbc5b4eeb52c2d971d779ab4834"
        },
        {
          "type": "bitcoin",
          "block_height": 972956,
          "merkle_root": "4071a7ab56c5818aef15079b96bb02eab8d1937111f6627e87c13f5ba0e6add9"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T18:00:31.661Z",
      "updated_at": "2026-10-24T19:03:06.797Z",
      "bitcoin_block_height": 972956,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6adcf23fe158da6b826e99c261083232b43d1c9dad5df9eb2a069cfe4def333b67c576a9a541d2937e890a7a"
        },
        {
          "type": "bitcoin",
          "block_height": 972956,
          "merkle_root": "4071a7ab56c5818aef15079b96bb02eab8d1937111f6627e87c13f5ba0e6add9"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "confirmed",
      "submitted_at": "2026-10-24T18:00:31.661Z",
      "updated_at": "2026-10-24T19:03:06.797Z",
      "bitcoin_block_height": 972959,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6adcf2403c7073bd0f2f0556697302358f67fa9579fba45ecf2b517f5c6827e5294745d76ebe5c68be574903"
        },
        {
          "type": "bitcoin",
          "block_height": 972959,
          "merkle_root": "b24f80d7cd4c29a7c0218013b1bbb0a729ae2ef53b720f465ca9c5b104743f66"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/52/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."
}