{
  "height": 159,
  "block_hash": "2f45028afc049438a46f1e9be5642f0b1de4325a5ba8e7e72142c369bb82429a",
  "status": "confirmed",
  "bitcoin_block_height": 973009,
  "digest": {
    "alg": "sha256",
    "hex": "2f45028afc049438a46f1e9be5642f0b1de4325a5ba8e7e72142c369bb82429a",
    "preimage": "block:{\"at\":\"2026-10-25T02:55:02.559Z\",\"entry_count\":2,\"first_seq\":190,\"height\":159,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":191,\"merkle_root\":\"fc1dbf45be305339e4b2a260b4d8923fb283225faed71ccfe63832ecd66c01ee\",\"prev_hash\":\"58861623133395651fd3cbbdad1ddb86d618a387e56c95df0fc68e5a9efe5923\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-25T02:59:17.526Z",
      "updated_at": "2026-10-25T04:08:50.519Z",
      "bitcoin_block_height": 973009,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6add7087749ab14b25e614121b26ffd54895339fbe68a39ee81b729fd24faf5161135d154376db681153e51d"
        },
        {
          "type": "bitcoin",
          "block_height": 973009,
          "merkle_root": "141cf56f7b4558df3d03647f005a747090c85f503425d28edb46d7b28e45ce37"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-25T02:59:17.526Z",
      "updated_at": "2026-10-25T04:08:50.519Z",
      "bitcoin_block_height": 973009,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6add708755173d0f769f24b863a3f2bcc7ae94e49b81b87e4d43ee150c716b0d093104a6e0f64c9578f80917"
        },
        {
          "type": "bitcoin",
          "block_height": 973009,
          "merkle_root": "141cf56f7b4558df3d03647f005a747090c85f503425d28edb46d7b28e45ce37"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "pending",
      "submitted_at": "2026-10-25T02:59:17.526Z",
      "updated_at": "2026-10-25T02:59:17.526Z",
      "bitcoin_block_height": null,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6add708723a81909931d4ce3ee50e1cf309115ebb5922846a3390966d1e1a1a0e38d4a94d9dab3a2e8c61de0"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/159/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."
}