{
  "height": 53,
  "block_hash": "1d04c22f98a3011b7c622d500dcd20cf0ce09159357e5cdd7f6222d7b99ab1c1",
  "status": "confirmed",
  "bitcoin_block_height": 972956,
  "digest": {
    "alg": "sha256",
    "hex": "1d04c22f98a3011b7c622d500dcd20cf0ce09159357e5cdd7f6222d7b99ab1c1",
    "preimage": "block:{\"at\":\"2026-10-24T17:56:02.016Z\",\"entry_count\":1,\"first_seq\":55,\"height\":53,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":55,\"merkle_root\":\"f4f9fc0cd358600ed12b6b985b4a8ff5f08ef6f8b8791c4462d0482ffcfbe816\",\"prev_hash\":\"1a5b72a6596215186920e224990bd3e068414a28cf34f0ba933f0c36ee41ed85\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T18:00:31.661Z",
      "updated_at": "2026-10-24T19:03:06.797Z",
      "bitcoin_block_height": 972956,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6adcf241704d994c9cb6a47636e00cda1556df2cf8f2c23016d3287a784db882fc4780e030f874a8fbefab08"
        },
        {
          "type": "bitcoin",
          "block_height": 972956,
          "merkle_root": "4071a7ab56c5818aef15079b96bb02eab8d1937111f6627e87c13f5ba0e6add9"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T18:00:31.661Z",
      "updated_at": "2026-10-24T19:03:06.797Z",
      "bitcoin_block_height": 972956,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6adcf2408bc4f5e0ad396af0d2ba80e5c2fde3e2e77663688b87006b86ce7bd5461617b493537e4938cee448"
        },
        {
          "type": "bitcoin",
          "block_height": 972956,
          "merkle_root": "4071a7ab56c5818aef15079b96bb02eab8d1937111f6627e87c13f5ba0e6add9"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "confirmed",
      "submitted_at": "2026-10-24T18:00:31.661Z",
      "updated_at": "2026-10-24T19:03:06.797Z",
      "bitcoin_block_height": 972959,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6adcf241db3b4e94a6e1b330a15a4d902da5241a547856951a666ac114f7f4eabfee9f824fba772de20eec6a"
        },
        {
          "type": "bitcoin",
          "block_height": 972959,
          "merkle_root": "b24f80d7cd4c29a7c0218013b1bbb0a729ae2ef53b720f465ca9c5b104743f66"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/53/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."
}