{
  "height": 143,
  "block_hash": "ae36c2e410730badd0671ae78f5cb81f2f2e5f5a9a24981f488d0b247073aa8a",
  "status": "confirmed",
  "bitcoin_block_height": 973001,
  "digest": {
    "alg": "sha256",
    "hex": "ae36c2e410730badd0671ae78f5cb81f2f2e5f5a9a24981f488d0b247073aa8a",
    "preimage": "block:{\"at\":\"2026-10-25T01:31:18.810Z\",\"entry_count\":2,\"first_seq\":157,\"height\":143,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":158,\"merkle_root\":\"95b6dbeb41199ef8570eb8641253c187117d6ad4c76067e752f41ed5b0a14d10\",\"prev_hash\":\"9cc308c702fa571eaaf3f1aa1d631f8cc7dc1d71a2c551ddd9f7bd0983848b90\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-25T01:39:22.930Z",
      "updated_at": "2026-10-25T03:13:01.807Z",
      "bitcoin_block_height": 973001,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6add5dcb880677095b2d4cb2964aebb03e241dd67c3f8f01f1d37b01305c9152c41815342da711eae19c144e"
        },
        {
          "type": "bitcoin",
          "block_height": 973001,
          "merkle_root": "7523ceb63fadcaf8408d48fb7985b756a5380aa791b1c4b4c0859bc661126d19"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-25T01:39:22.930Z",
      "updated_at": "2026-10-25T03:13:01.807Z",
      "bitcoin_block_height": 973001,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6add5dcb4864169201d9836aa30d3f460038f7e753d8307e758109c966367858966436e06465bdbb49a130f6"
        },
        {
          "type": "bitcoin",
          "block_height": 973001,
          "merkle_root": "7523ceb63fadcaf8408d48fb7985b756a5380aa791b1c4b4c0859bc661126d19"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "pending",
      "submitted_at": "2026-10-25T01:39:22.930Z",
      "updated_at": "2026-10-25T01:39:22.930Z",
      "bitcoin_block_height": null,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6add5dcc404402462479d98679d17397621ac1e948c1adb8b5529da3dc7c0b6cc9a11a83b8d7bdb47eed9010"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/143/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."
}