{
  "height": 25,
  "block_hash": "6f33705e4ca137b35d6788604b2c7f937dcb7130af2f0a6df1c5a64d72be0b69",
  "status": "confirmed",
  "bitcoin_block_height": 972929,
  "digest": {
    "alg": "sha256",
    "hex": "6f33705e4ca137b35d6788604b2c7f937dcb7130af2f0a6df1c5a64d72be0b69",
    "preimage": "block:{\"at\":\"2026-10-24T13:57:11.199Z\",\"entry_count\":1,\"first_seq\":27,\"height\":25,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":27,\"merkle_root\":\"dd7573d0df0f933732ce4bbfb8d304490d33ddbda1e2f6ab9b34df4020595311\",\"prev_hash\":\"71201f58bd9113a49d386f8f596bbe5832bad37b5d590281b7d3d2e4e309666d\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T13:57:41.214Z",
      "updated_at": "2026-10-24T15:07:11.219Z",
      "bitcoin_block_height": 972929,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6adcb95672826274fee83dfa26d415229c6bda08ed61b2c8d7f0fb3b74baf2d8410b76940ae27ec8a0af00dc"
        },
        {
          "type": "bitcoin",
          "block_height": 972929,
          "merkle_root": "44738cdf7d588ad4627c41d8548560771f1cb71de6e05deefcea0703f65de1e3"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T13:57:41.214Z",
      "updated_at": "2026-10-24T16:57:12.873Z",
      "bitcoin_block_height": 972944,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6adcb955a1bbcf06d883a79c2fadcb0e688049c57c6ccb9a20c76c862c902ceea01a9630bb3bec671ae78468"
        },
        {
          "type": "bitcoin",
          "block_height": 972944,
          "merkle_root": "7cef4b3063deecf55c9f86b448194f888a3723e26d1e7aaa1ef6b349573d4656"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "confirmed",
      "submitted_at": "2026-10-24T13:57:41.214Z",
      "updated_at": "2026-10-24T19:53:06.806Z",
      "bitcoin_block_height": 972959,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6adcb956a549152e94b2df84d16420df983dd47eb6cd3ee8a299eb567b34591e572dd850dd6f19df474ea6cc"
        },
        {
          "type": "bitcoin",
          "block_height": 972959,
          "merkle_root": "b24f80d7cd4c29a7c0218013b1bbb0a729ae2ef53b720f465ca9c5b104743f66"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/25/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."
}