{
  "height": 37,
  "block_hash": "bab99bc29377c1a44e58146832dba28e2a67e248bf6e777a83d3eb0aaf756aa6",
  "status": "confirmed",
  "bitcoin_block_height": 972955,
  "digest": {
    "alg": "sha256",
    "hex": "bab99bc29377c1a44e58146832dba28e2a67e248bf6e777a83d3eb0aaf756aa6",
    "preimage": "block:{\"at\":\"2026-10-24T16:31:48.132Z\",\"entry_count\":1,\"first_seq\":39,\"height\":37,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":39,\"merkle_root\":\"062e30d51498b6f602daae7b2561080c56fc50ff393f6d2ea4d6d0f86668c000\",\"prev_hash\":\"cd143293f30ae85e5bd8a8306435ec00b08fea5b88c2a36fb181bba0e62a6a47\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T16:36:17.957Z",
      "updated_at": "2026-10-24T18:40:31.672Z",
      "bitcoin_block_height": 972955,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6adcde84fbf52926a9f22875e6e9acbff0c3a6d4dcf6d9040c3a4df7b76bc9bed3d04f0fac4a1980931bbbbd"
        },
        {
          "type": "bitcoin",
          "block_height": 972955,
          "merkle_root": "3070b4b64d766acc6b8c2ec362acc3415aa2e07e9a5bc2e992ccd9c676ae577b"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T16:36:17.957Z",
      "updated_at": "2026-10-24T18:40:31.672Z",
      "bitcoin_block_height": 972955,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6adcde832ce268109187a813ffa3afef1552591c28041d8ad0e66298caaa89d2682e50162ab95097f2cc6935"
        },
        {
          "type": "bitcoin",
          "block_height": 972955,
          "merkle_root": "3070b4b64d766acc6b8c2ec362acc3415aa2e07e9a5bc2e992ccd9c676ae577b"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "confirmed",
      "submitted_at": "2026-10-24T16:36:17.957Z",
      "updated_at": "2026-10-24T19:53:06.806Z",
      "bitcoin_block_height": 972959,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6adcde83b5227407b6deda6fa238c763c219ad2a140c2248b96409f7d36e7ff09db1640960569b8ddb463c26"
        },
        {
          "type": "bitcoin",
          "block_height": 972959,
          "merkle_root": "b24f80d7cd4c29a7c0218013b1bbb0a729ae2ef53b720f465ca9c5b104743f66"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/37/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."
}