{
  "height": 136,
  "block_hash": "448a3d91e8d5720ae15363bb215af15f640588c004cd5ef237c986c7705a7916",
  "status": "confirmed",
  "bitcoin_block_height": 973001,
  "digest": {
    "alg": "sha256",
    "hex": "448a3d91e8d5720ae15363bb215af15f640588c004cd5ef237c986c7705a7916",
    "preimage": "block:{\"at\":\"2026-10-25T00:56:17.991Z\",\"entry_count\":2,\"first_seq\":143,\"height\":136,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":144,\"merkle_root\":\"b7e16e0cf9048f80be1d26e7df725a98380a8b91cec76a2c0e8cc0e5392de16b\",\"prev_hash\":\"033d651090a715621a5941b2699fcf987915b917226e94c02fbef20775b0dc88\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-25T01:00:47.439Z",
      "updated_at": "2026-10-25T03:13:01.807Z",
      "bitcoin_block_height": 973001,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6add54c25e04891a38eb34465c3101e8d392c9a2c8e280d746aff804ac2b4c859e1b477c6f2ae03a7ab2699d"
        },
        {
          "type": "bitcoin",
          "block_height": 973001,
          "merkle_root": "7523ceb63fadcaf8408d48fb7985b756a5380aa791b1c4b4c0859bc661126d19"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-25T01:00:47.439Z",
      "updated_at": "2026-10-25T03:13:01.807Z",
      "bitcoin_block_height": 973001,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6add54c1fb82bbb9cc7f6c29c723c0cba15cfeff39ce1bee70771a42a7d0cbcf3d8dde08767318d0b568f73d"
        },
        {
          "type": "bitcoin",
          "block_height": 973001,
          "merkle_root": "7523ceb63fadcaf8408d48fb7985b756a5380aa791b1c4b4c0859bc661126d19"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "pending",
      "submitted_at": "2026-10-25T01:00:47.439Z",
      "updated_at": "2026-10-25T01:00:47.439Z",
      "bitcoin_block_height": null,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6add54c1a0db4d5a0a32d86f13904d9d19d75ed445113d5a158b2eabfc52c4fe3ab2d7d3aeef23fc321060c2"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/136/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."
}