{
  "height": 137,
  "block_hash": "600330c4d6387a8e56e91f00104fba7fa77063047b8b48055bee33a21cb72449",
  "status": "confirmed",
  "bitcoin_block_height": 973001,
  "digest": {
    "alg": "sha256",
    "hex": "600330c4d6387a8e56e91f00104fba7fa77063047b8b48055bee33a21cb72449",
    "preimage": "block:{\"at\":\"2026-10-25T01:01:18.228Z\",\"entry_count\":2,\"first_seq\":145,\"height\":137,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":146,\"merkle_root\":\"ece3ff9c87564af778c32696d214145076f8a224cc62ab936434c2648136a157\",\"prev_hash\":\"448a3d91e8d5720ae15363bb215af15f640588c004cd5ef237c986c7705a7916\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-25T01:10:47.440Z",
      "updated_at": "2026-10-25T03:13:01.807Z",
      "bitcoin_block_height": 973001,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6add5718e0b61c532c573a0454d98c128c9788b1c9175b55af208b8b8262c9b5c9a32cd1dbcaef2763a7f9cf"
        },
        {
          "type": "bitcoin",
          "block_height": 973001,
          "merkle_root": "7523ceb63fadcaf8408d48fb7985b756a5380aa791b1c4b4c0859bc661126d19"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-25T01:10:47.440Z",
      "updated_at": "2026-10-25T03:13:01.807Z",
      "bitcoin_block_height": 973001,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6add5718599df59f0df5be99b502ff3b1350c1c7da4d938c82111d6b478199800939639e26dc9e0f0cd14a40"
        },
        {
          "type": "bitcoin",
          "block_height": 973001,
          "merkle_root": "7523ceb63fadcaf8408d48fb7985b756a5380aa791b1c4b4c0859bc661126d19"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "pending",
      "submitted_at": "2026-10-25T01:10:47.440Z",
      "updated_at": "2026-10-25T01:10:47.440Z",
      "bitcoin_block_height": null,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6add5718d1cc786e0ca03ac6f6486c7e2f1bd21d31b7950bbcac490b0c469999cc0ad584c5c76148051ff354"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/137/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."
}