{
  "height": 139,
  "block_hash": "b638309b5396104b73eeffad89fca54d83e9d03409135c70b0fc497b0130e76f",
  "status": "confirmed",
  "bitcoin_block_height": 973001,
  "digest": {
    "alg": "sha256",
    "hex": "b638309b5396104b73eeffad89fca54d83e9d03409135c70b0fc497b0130e76f",
    "preimage": "block:{\"at\":\"2026-10-25T01:11:18.311Z\",\"entry_count\":2,\"first_seq\":149,\"height\":139,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":150,\"merkle_root\":\"df1c8efd6ae860571f916023f250d9ca0b7c99c3990b3d7acc18aef4378d6c17\",\"prev_hash\":\"10cf500f9ed2cc4af6d5bab02b10e8b5ebedbfaf61fa60910d8035915c8dc39c\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-25T01:20:47.443Z",
      "updated_at": "2026-10-25T03:13:01.807Z",
      "bitcoin_block_height": 973001,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6add5970da1076259d449f88b01f1fcb25acdffd3d8e9b8c8b439b26a9497d823524f2c80b827a95d21c93a7"
        },
        {
          "type": "bitcoin",
          "block_height": 973001,
          "merkle_root": "7523ceb63fadcaf8408d48fb7985b756a5380aa791b1c4b4c0859bc661126d19"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-25T01:20:47.443Z",
      "updated_at": "2026-10-25T03:13:01.807Z",
      "bitcoin_block_height": 973001,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6add596f01a40e72bdea1d92eb83c52220cf75d766d4cf475593ce1a880c76f07020470420246f3aa3c1322f"
        },
        {
          "type": "bitcoin",
          "block_height": 973001,
          "merkle_root": "7523ceb63fadcaf8408d48fb7985b756a5380aa791b1c4b4c0859bc661126d19"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "pending",
      "submitted_at": "2026-10-25T01:20:47.443Z",
      "updated_at": "2026-10-25T01:20:47.443Z",
      "bitcoin_block_height": null,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6add596f59ff8e67004fa282dfa426ef722f2ca0aea7b6e883a0b142f33c94f35ee7c78d7f5f6ff74d7395ec"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/139/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."
}