{
  "height": 35,
  "block_hash": "ca73f1e241eb6f79f128ccb7e798d523e44600ce063e2902fc1a19dbfc27f7d5",
  "status": "confirmed",
  "bitcoin_block_height": 972955,
  "digest": {
    "alg": "sha256",
    "hex": "ca73f1e241eb6f79f128ccb7e798d523e44600ce063e2902fc1a19dbfc27f7d5",
    "preimage": "block:{\"at\":\"2026-10-24T16:21:48.076Z\",\"entry_count\":1,\"first_seq\":37,\"height\":35,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":37,\"merkle_root\":\"c02c87c88518cce786cea6636d0da16efa3b7bde54b96609beffc2a075325daf\",\"prev_hash\":\"536950c724f3818f603663bd5a20fef3a4dc586ae7c8e66fbc49d0c630d8efd0\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T16:26:17.956Z",
      "updated_at": "2026-10-24T18:30:31.668Z",
      "bitcoin_block_height": 972955,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6adcdc2a8add9937cb4d48b4353ae06e04998022daca8bf977f1c4444ede08facba5dc6a74231dec43215720"
        },
        {
          "type": "bitcoin",
          "block_height": 972955,
          "merkle_root": "3070b4b64d766acc6b8c2ec362acc3415aa2e07e9a5bc2e992ccd9c676ae577b"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T16:26:17.956Z",
      "updated_at": "2026-10-24T18:30:31.668Z",
      "bitcoin_block_height": 972955,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6adcdc2ace4d6694b4e319572a3c4ab1e901f8e5de97a74301f95388689f5c195bf33260a20196a004110057"
        },
        {
          "type": "bitcoin",
          "block_height": 972955,
          "merkle_root": "3070b4b64d766acc6b8c2ec362acc3415aa2e07e9a5bc2e992ccd9c676ae577b"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "confirmed",
      "submitted_at": "2026-10-24T16:26:17.956Z",
      "updated_at": "2026-10-24T19:53:06.806Z",
      "bitcoin_block_height": 972959,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6adcdc2a85a8493dc7682e83d30eb764f367842a4cc4e0f1c53bf01e8aa81c090bb591f5eafcc1489b745a8d"
        },
        {
          "type": "bitcoin",
          "block_height": 972959,
          "merkle_root": "b24f80d7cd4c29a7c0218013b1bbb0a729ae2ef53b720f465ca9c5b104743f66"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/35/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."
}