{
  "height": 112,
  "block_hash": "b40a4372d5b099f9c9db7685cc90156b0b9c49ddb6f0ce4edf13696a7545e974",
  "status": "confirmed",
  "bitcoin_block_height": 972988,
  "digest": {
    "alg": "sha256",
    "hex": "b40a4372d5b099f9c9db7685cc90156b0b9c49ddb6f0ce4edf13696a7545e974",
    "preimage": "block:{\"at\":\"2026-10-24T22:58:37.803Z\",\"entry_count\":1,\"first_seq\":115,\"height\":112,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":115,\"merkle_root\":\"97d3e380e65a3c14cd8b070ec30638bdfc636bae2103274e4d19e4a1c2ab2423\",\"prev_hash\":\"f36a23b77b08f7aa1ae9326999ed9783d364f8545467e00ef17f98aa737a4da9\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T23:08:07.675Z",
      "updated_at": "2026-10-25T00:13:36.872Z",
      "bitcoin_block_height": 972988,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6add3a5896e8eb44e72efbe718c949e2701eba6861ba088aeec33ff7fb932db12e2bed025e8d4c40821c13b4"
        },
        {
          "type": "bitcoin",
          "block_height": 972988,
          "merkle_root": "3c587ddc5f28b4732a5eeb27216e13677e4348754375484a771cd576c6e70198"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T23:08:07.675Z",
      "updated_at": "2026-10-25T00:13:36.872Z",
      "bitcoin_block_height": 972988,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6add3a58c7a937e912dcd9306f11c7e03b51199d35105ddbe77a0e0386ff0df079e208e957e80d7eacd73e09"
        },
        {
          "type": "bitcoin",
          "block_height": 972988,
          "merkle_root": "3c587ddc5f28b4732a5eeb27216e13677e4348754375484a771cd576c6e70198"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "confirmed",
      "submitted_at": "2026-10-24T23:08:07.675Z",
      "updated_at": "2026-10-25T02:39:47.523Z",
      "bitcoin_block_height": 972999,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6add3a58700086064d3f92f661d602822b12e428966f38718a53305fedb26c7fcbc7d2e25f8ba334ffbf8fd2"
        },
        {
          "type": "bitcoin",
          "block_height": 972999,
          "merkle_root": "ae0e717f0d642956016a8572888d23fb045efcac654b542c5ac908707f3b5590"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/112/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."
}