{
  "height": 43,
  "block_hash": "e02ba03d8c780817ef6cee7e97c44ab4eee3bfdbf1c0b3f97d1c2876fb89a733",
  "status": "confirmed",
  "bitcoin_block_height": 972955,
  "digest": {
    "alg": "sha256",
    "hex": "e02ba03d8c780817ef6cee7e97c44ab4eee3bfdbf1c0b3f97d1c2876fb89a733",
    "preimage": "block:{\"at\":\"2026-10-24T17:02:13.027Z\",\"entry_count\":1,\"first_seq\":45,\"height\":43,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":45,\"merkle_root\":\"23d504939129fde7c84e732268a2ae30b5967add93e11e270f196b2085db39c4\",\"prev_hash\":\"1fb7d6625f6683c54a6254e8e5525bfcceb3a9cb10004e6fce3452720e6e4049\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T17:05:36.030Z",
      "updated_at": "2026-10-24T18:43:36.793Z",
      "bitcoin_block_height": 972955,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6adce56174966b1a10a7f0d54bef50f3a0d5424822f99af29b13907b5483d56e5872d30fdb7a5dd9394fbd82"
        },
        {
          "type": "bitcoin",
          "block_height": 972955,
          "merkle_root": "3070b4b64d766acc6b8c2ec362acc3415aa2e07e9a5bc2e992ccd9c676ae577b"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T17:05:36.030Z",
      "updated_at": "2026-10-24T18:43:36.793Z",
      "bitcoin_block_height": 972955,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6adce5601bbbd2f0015de70d424a87cb52e26134c34ef707c5be2301688be0ba9078a4cc1eacc21273b70061"
        },
        {
          "type": "bitcoin",
          "block_height": 972955,
          "merkle_root": "3070b4b64d766acc6b8c2ec362acc3415aa2e07e9a5bc2e992ccd9c676ae577b"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "confirmed",
      "submitted_at": "2026-10-24T17:05:36.030Z",
      "updated_at": "2026-10-24T19:53:06.806Z",
      "bitcoin_block_height": 972959,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6adce5612648204bb5399e1efeee666d569a086296d41a735be245dcb425659ab02176044d368b5912201348"
        },
        {
          "type": "bitcoin",
          "block_height": 972959,
          "merkle_root": "b24f80d7cd4c29a7c0218013b1bbb0a729ae2ef53b720f465ca9c5b104743f66"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/43/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."
}