{
  "height": 83,
  "block_hash": "d9f9eaab1130348c3556de5c21f997377ccccffae4f5d87fca13fe5e37454e9f",
  "status": "confirmed",
  "bitcoin_block_height": 972973,
  "digest": {
    "alg": "sha256",
    "hex": "d9f9eaab1130348c3556de5c21f997377ccccffae4f5d87fca13fe5e37454e9f",
    "preimage": "block:{\"at\":\"2026-10-24T20:26:19.156Z\",\"entry_count\":1,\"first_seq\":86,\"height\":83,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":86,\"merkle_root\":\"5016a60ac7de7bc036400ce0183b0dacf9658d0196fc5941e23632376d9706b6\",\"prev_hash\":\"07d3764811fabd7cc11c30cdde9882fbee7937f2087f18534393ce5a8e7a7640\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T20:30:48.846Z",
      "updated_at": "2026-10-24T21:36:48.984Z",
      "bitcoin_block_height": 972973,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6add157a564e06fcee14de79c225788e90766952ecec098d2d0503d393d8b082270d717c33d504cdfe23d049"
        },
        {
          "type": "bitcoin",
          "block_height": 972973,
          "merkle_root": "7b962d9bb24a2e8b06223bcd5ecb1acb34654eceb4c36cc585ac7759f02ed4e0"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T20:30:48.846Z",
      "updated_at": "2026-10-24T21:36:48.984Z",
      "bitcoin_block_height": 972973,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6add157ac8a6aae47f29cae6758d9178ebe547a6f095414966084ae647fd1a2c047fd619b0fa631becd5a781"
        },
        {
          "type": "bitcoin",
          "block_height": 972973,
          "merkle_root": "7b962d9bb24a2e8b06223bcd5ecb1acb34654eceb4c36cc585ac7759f02ed4e0"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "confirmed",
      "submitted_at": "2026-10-24T20:30:48.846Z",
      "updated_at": "2026-10-25T02:49:17.524Z",
      "bitcoin_block_height": 972999,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6add157a6a25436f7f3b5abc813ea18544e870f063af1cb0c0b6822e363e4f00ade12eff5430232d9ca2758e"
        },
        {
          "type": "bitcoin",
          "block_height": 972999,
          "merkle_root": "ae0e717f0d642956016a8572888d23fb045efcac654b542c5ac908707f3b5590"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/83/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."
}