{
  "height": 49,
  "block_hash": "b13e4c46d032e2c38e0757b03b4a397a73ae6d556cacf30852327e55a27b1e0b",
  "status": "confirmed",
  "bitcoin_block_height": 972955,
  "digest": {
    "alg": "sha256",
    "hex": "b13e4c46d032e2c38e0757b03b4a397a73ae6d556cacf30852327e55a27b1e0b",
    "preimage": "block:{\"at\":\"2026-10-24T17:36:01.940Z\",\"entry_count\":1,\"first_seq\":51,\"height\":49,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":51,\"merkle_root\":\"574ce28931159f710752bb9345a9eac005788d9b91480854f5def7d71d2ed306\",\"prev_hash\":\"9c7b8594dc5d394d23e2830f69c4d71dcafdb2731a4284495e5eb7b1fbbc0c89\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T17:40:31.659Z",
      "updated_at": "2026-10-24T18:40:31.672Z",
      "bitcoin_block_height": 972955,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6adced91fa8dcd87ca8794db4fac18f996103e3a1f525fabc53c1550ce97c51bd4e5f4a97c3ec58b17bc9f40"
        },
        {
          "type": "bitcoin",
          "block_height": 972955,
          "merkle_root": "3070b4b64d766acc6b8c2ec362acc3415aa2e07e9a5bc2e992ccd9c676ae577b"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T17:40:31.659Z",
      "updated_at": "2026-10-24T18:40:31.672Z",
      "bitcoin_block_height": 972955,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6adced9103fa87673d531b23b26329a46d15d166a9be7e64d38ab6b39bfc93435fb06d705df5df6ede826994"
        },
        {
          "type": "bitcoin",
          "block_height": 972955,
          "merkle_root": "3070b4b64d766acc6b8c2ec362acc3415aa2e07e9a5bc2e992ccd9c676ae577b"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "confirmed",
      "submitted_at": "2026-10-24T17:40:31.659Z",
      "updated_at": "2026-10-24T19:53:06.806Z",
      "bitcoin_block_height": 972959,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6adced91757858d0874f16cd778d703042f84552f808563a47340cd3d5f83fba8eaaae471a8f27e1cb255974"
        },
        {
          "type": "bitcoin",
          "block_height": 972959,
          "merkle_root": "b24f80d7cd4c29a7c0218013b1bbb0a729ae2ef53b720f465ca9c5b104743f66"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/49/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."
}