{
  "height": 42,
  "block_hash": "1fb7d6625f6683c54a6254e8e5525bfcceb3a9cb10004e6fce3452720e6e4049",
  "status": "confirmed",
  "bitcoin_block_height": 972955,
  "digest": {
    "alg": "sha256",
    "hex": "1fb7d6625f6683c54a6254e8e5525bfcceb3a9cb10004e6fce3452720e6e4049",
    "preimage": "block:{\"at\":\"2026-10-24T16:56:42.852Z\",\"entry_count\":1,\"first_seq\":44,\"height\":42,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":44,\"merkle_root\":\"3dd873ce33f1cdc9b143dc556a89655e5331855d942b078d2f872823de3be5a5\",\"prev_hash\":\"cd1a4fa67c77323ff876d68079b66c98684b677c1cefd776618d4bfca9c674e5\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T16:57:12.873Z",
      "updated_at": "2026-10-24T18:43:36.793Z",
      "bitcoin_block_height": 972955,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6adce36ab3de5b58b5153a641aac8e663ded130ca8911bb5ef6c6a677cc7e8476ab95168728b4f78cf1a3780"
        },
        {
          "type": "bitcoin",
          "block_height": 972955,
          "merkle_root": "3070b4b64d766acc6b8c2ec362acc3415aa2e07e9a5bc2e992ccd9c676ae577b"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T16:57:12.873Z",
      "updated_at": "2026-10-24T18:43:36.793Z",
      "bitcoin_block_height": 972955,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6adce369ee67ab147f2e2a894e01e9169719aba01928c737b5baff3ceddd70e0c0a6d33315fac0975873a3af"
        },
        {
          "type": "bitcoin",
          "block_height": 972955,
          "merkle_root": "3070b4b64d766acc6b8c2ec362acc3415aa2e07e9a5bc2e992ccd9c676ae577b"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "confirmed",
      "submitted_at": "2026-10-24T16:57:12.873Z",
      "updated_at": "2026-10-24T19:53:06.806Z",
      "bitcoin_block_height": 972959,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6adce36917c9ad9ef38779c4977d04dd1a946fac8e317de1177255027faa85aee1877f38cd2ca1cd747a6b34"
        },
        {
          "type": "bitcoin",
          "block_height": 972959,
          "merkle_root": "b24f80d7cd4c29a7c0218013b1bbb0a729ae2ef53b720f465ca9c5b104743f66"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/42/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."
}