{
  "height": 142,
  "block_hash": "9cc308c702fa571eaaf3f1aa1d631f8cc7dc1d71a2c551ddd9f7bd0983848b90",
  "status": "confirmed",
  "bitcoin_block_height": 973001,
  "digest": {
    "alg": "sha256",
    "hex": "9cc308c702fa571eaaf3f1aa1d631f8cc7dc1d71a2c551ddd9f7bd0983848b90",
    "preimage": "block:{\"at\":\"2026-10-25T01:26:18.785Z\",\"entry_count\":2,\"first_seq\":155,\"height\":142,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":156,\"merkle_root\":\"8d4c8018c4e9f0542dfff0e637d5c4029fbcaea277d5d25fc26518cc43d91a86\",\"prev_hash\":\"1a45da3a9a9588f27802e2e506ab27dfec1035927b6382b5a73e5be6ef4abe9c\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-25T01:30:47.444Z",
      "updated_at": "2026-10-25T03:13:01.807Z",
      "bitcoin_block_height": 973001,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6add5bc893f4963cda9d13e1168eb2e5ed2e18bfd8b1f361bb4eba413c480563aefb6e5df48a2d44f25ee317"
        },
        {
          "type": "bitcoin",
          "block_height": 973001,
          "merkle_root": "7523ceb63fadcaf8408d48fb7985b756a5380aa791b1c4b4c0859bc661126d19"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-25T01:30:47.444Z",
      "updated_at": "2026-10-25T03:13:01.807Z",
      "bitcoin_block_height": 973001,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6add5bc94291af0aa44b62069720d7ad95cbe75f43909a4a980168fd873aec9fc271f2f6442fde9a59c96a31"
        },
        {
          "type": "bitcoin",
          "block_height": 973001,
          "merkle_root": "7523ceb63fadcaf8408d48fb7985b756a5380aa791b1c4b4c0859bc661126d19"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "pending",
      "submitted_at": "2026-10-25T01:30:47.444Z",
      "updated_at": "2026-10-25T01:30:47.444Z",
      "bitcoin_block_height": null,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6add5bc94711fc9ce8c69d8a578f4be37140e4b0aa0048f03dd9608e91c79a83487c63521ee4da2be42bb32c"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/142/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."
}