{
  "height": 81,
  "block_hash": "1414e24393ca8eba6221b59c32827eddcfbd523f36570897d11de33827908cf2",
  "status": "confirmed",
  "bitcoin_block_height": 972970,
  "digest": {
    "alg": "sha256",
    "hex": "1414e24393ca8eba6221b59c32827eddcfbd523f36570897d11de33827908cf2",
    "preimage": "block:{\"at\":\"2026-10-24T20:16:19.041Z\",\"entry_count\":1,\"first_seq\":84,\"height\":81,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":84,\"merkle_root\":\"4905959ad0359eaac2e8744d8bac2ce2e8716f89631e5d28ecda1df8998ce445\",\"prev_hash\":\"7aa3f8d7ca94e18f19eb3ad84e78157e49aca2eaec910d9007a12385aa5c4a67\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T20:20:48.844Z",
      "updated_at": "2026-10-24T21:26:48.983Z",
      "bitcoin_block_height": 972970,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6add1322721003416c3a51080ecf3bf9730581c837940b1678a5de972b6de1112ddce4ec841a1e1db5641f84"
        },
        {
          "type": "bitcoin",
          "block_height": 972970,
          "merkle_root": "981994db85d44894e89054822a38e892b6dfa0f4a87277463faafcbbd05de202"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T20:20:48.844Z",
      "updated_at": "2026-10-24T21:26:48.983Z",
      "bitcoin_block_height": 972970,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6add132236b90ebb7d30b29569169e28c70ee099f9714ee302a1981f1ab8331b7fe650c737fb340daa822f07"
        },
        {
          "type": "bitcoin",
          "block_height": 972970,
          "merkle_root": "981994db85d44894e89054822a38e892b6dfa0f4a87277463faafcbbd05de202"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "confirmed",
      "submitted_at": "2026-10-24T20:20:48.844Z",
      "updated_at": "2026-10-25T02:49:17.524Z",
      "bitcoin_block_height": 972999,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6add1323c25c368b185ff93b65f9e68d08197e11a54ea51507d39924c1f41dcd336f424a34e91c208168fb7a"
        },
        {
          "type": "bitcoin",
          "block_height": 972999,
          "merkle_root": "ae0e717f0d642956016a8572888d23fb045efcac654b542c5ac908707f3b5590"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/81/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."
}