{
  "height": 76,
  "block_hash": "494aad86debc0719cb9353b850c7245ed5de4d1c14e0aedadc6f679e1d3787fd",
  "status": "confirmed",
  "bitcoin_block_height": 972970,
  "digest": {
    "alg": "sha256",
    "hex": "494aad86debc0719cb9353b850c7245ed5de4d1c14e0aedadc6f679e1d3787fd",
    "preimage": "block:{\"at\":\"2026-10-24T19:53:37.597Z\",\"entry_count\":1,\"first_seq\":78,\"height\":76,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":78,\"merkle_root\":\"e5713271bf3020a9a254d09782885ce0301052eb6840eae7e450bb44df1413e1\",\"prev_hash\":\"8cb6496179641e5d87bbc10926e716b3924f48f62ff2bf51be9cd3ce2269f1f4\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T20:03:06.808Z",
      "updated_at": "2026-10-24T21:06:48.979Z",
      "bitcoin_block_height": 972970,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6add0efc2ed8abaaf7dd769ce48db070be9d4ba666097b0772883e5f218b554f21e2541a9113c1153617d449"
        },
        {
          "type": "bitcoin",
          "block_height": 972970,
          "merkle_root": "981994db85d44894e89054822a38e892b6dfa0f4a87277463faafcbbd05de202"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T20:03:06.808Z",
      "updated_at": "2026-10-24T21:06:48.979Z",
      "bitcoin_block_height": 972970,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6add0efbb278722565f7dceeb58f0159d0ccd3dde699c3dcdc65b382bc461d2fd90c02241dc458ea6809246d"
        },
        {
          "type": "bitcoin",
          "block_height": 972970,
          "merkle_root": "981994db85d44894e89054822a38e892b6dfa0f4a87277463faafcbbd05de202"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "confirmed",
      "submitted_at": "2026-10-24T20:03:06.808Z",
      "updated_at": "2026-10-25T02:49:17.524Z",
      "bitcoin_block_height": 972999,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6add0efc57d75dff799d29a0810c7e3ad79200496b5f89eea6a764ea5400e5cad5cb4d6a0d1bbd78f502cef4"
        },
        {
          "type": "bitcoin",
          "block_height": 972999,
          "merkle_root": "ae0e717f0d642956016a8572888d23fb045efcac654b542c5ac908707f3b5590"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/76/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."
}