{
  "height": 88,
  "block_hash": "e89405f28475395d1f0ce032212347ed82b0002ef91d54f70f8103b26105a301",
  "status": "confirmed",
  "bitcoin_block_height": 972976,
  "digest": {
    "alg": "sha256",
    "hex": "e89405f28475395d1f0ce032212347ed82b0002ef91d54f70f8103b26105a301",
    "preimage": "block:{\"at\":\"2026-10-24T20:52:19.455Z\",\"entry_count\":1,\"first_seq\":91,\"height\":88,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":91,\"merkle_root\":\"d5dccadfab180fddc8524478f46680d31d3a1b93e9065a9a267d09fbe6edfc29\",\"prev_hash\":\"0c78b37da6d905ca58cab9e1cccef50e76efa34f058bb296cd8159a1c0982b35\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T20:56:48.978Z",
      "updated_at": "2026-10-24T22:38:37.669Z",
      "bitcoin_block_height": 972976,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6add1b9277237191adff85b2ab09c78d33654e74b27ffcd223563eaa69a770eb726e036053eca22a88ff10f8"
        },
        {
          "type": "bitcoin",
          "block_height": 972976,
          "merkle_root": "327f3f74198d07fbddd3e6d92f719c3637f011825c131f919bc09961a99b60c9"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T20:56:48.978Z",
      "updated_at": "2026-10-24T22:38:37.669Z",
      "bitcoin_block_height": 972976,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6add1b921b06bceb38f2658dcf06141acead560da42b67af2c13b1c52cbb7eccedaed6ebf827b6d34e141581"
        },
        {
          "type": "bitcoin",
          "block_height": 972976,
          "merkle_root": "327f3f74198d07fbddd3e6d92f719c3637f011825c131f919bc09961a99b60c9"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "confirmed",
      "submitted_at": "2026-10-24T20:56:48.978Z",
      "updated_at": "2026-10-25T02:49:17.524Z",
      "bitcoin_block_height": 972999,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6add1b93d5ab123ce9b503147a52d87f9b5a996671e4d340a6f93972e0b414488852d347c44dc0ea2ea146dc"
        },
        {
          "type": "bitcoin",
          "block_height": 972999,
          "merkle_root": "ae0e717f0d642956016a8572888d23fb045efcac654b542c5ac908707f3b5590"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/88/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."
}