{
  "height": 56,
  "block_hash": "c61e742269f8bff5f144a31cc26448105cdd4769de529f6385211e7b5a421b23",
  "status": "confirmed",
  "bitcoin_block_height": 972961,
  "digest": {
    "alg": "sha256",
    "hex": "c61e742269f8bff5f144a31cc26448105cdd4769de529f6385211e7b5a421b23",
    "preimage": "block:{\"at\":\"2026-10-24T18:11:02.095Z\",\"entry_count\":1,\"first_seq\":58,\"height\":56,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":58,\"merkle_root\":\"4f76c7eacb3b0cadf210988e45291ab1ab20cb71c6d86d159ad4dc76a440139a\",\"prev_hash\":\"ff01b74e3834a7ff706bee409829ce6338233cd9c8b2b13071ce265401e7c115\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T18:20:31.663Z",
      "updated_at": "2026-10-24T20:11:18.860Z",
      "bitcoin_block_height": 972961,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6adcf6f0c242ad9dfa407f0ef902716f585a665cf65d76364b4679bf4a3186f418d1e8a36a7e3686a8718744"
        },
        {
          "type": "bitcoin",
          "block_height": 972961,
          "merkle_root": "b3457e6ad05eaeb5789bc2108e2879baa6811cef788def10eb23534d66875ea3"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T18:20:31.663Z",
      "updated_at": "2026-10-24T20:11:18.860Z",
      "bitcoin_block_height": 972961,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6adcf6f08cfdb63f39633bb2384c34347494c1354984a6c211836b6acff7bd0e9067c3ca0cba704060844db1"
        },
        {
          "type": "bitcoin",
          "block_height": 972961,
          "merkle_root": "b3457e6ad05eaeb5789bc2108e2879baa6811cef788def10eb23534d66875ea3"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "confirmed",
      "submitted_at": "2026-10-24T18:20:31.663Z",
      "updated_at": "2026-10-25T02:49:17.524Z",
      "bitcoin_block_height": 972999,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6adcf6f005c12f2587bb47f2226fd08ed2d4089e9caf17288302e684c9b1018922b2f69839966e9cc48d1dfb"
        },
        {
          "type": "bitcoin",
          "block_height": 972999,
          "merkle_root": "ae0e717f0d642956016a8572888d23fb045efcac654b542c5ac908707f3b5590"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/56/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."
}