{
  "height": 16,
  "block_hash": "23b1d9d14bc98fb3c7ce8ca866c600dcba008204ee99d8500daed8d6d6a4d7a4",
  "status": "confirmed",
  "bitcoin_block_height": 972677,
  "digest": {
    "alg": "sha256",
    "hex": "23b1d9d14bc98fb3c7ce8ca866c600dcba008204ee99d8500daed8d6d6a4d7a4",
    "preimage": "block:{\"at\":\"2026-10-23T00:10:51.141Z\",\"entry_count\":1,\"first_seq\":18,\"height\":16,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":18,\"merkle_root\":\"9d72f1ba50354220a96f35b883d8dc83101af698ed2bb0327d9060f996af1b7c\",\"prev_hash\":\"08975b51d6d5dd0907918c04a7a3006b301a5ec258ad60fa7b5ef461963c569d\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-23T00:12:49.197Z",
      "updated_at": "2026-10-23T01:12:49.202Z",
      "bitcoin_block_height": 972677,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6adaa682dfa32b1779e36ac007490adcf9d71a37351c527d841e545e052e6fcc75a108d9b472784e8c00135c"
        },
        {
          "type": "bitcoin",
          "block_height": 972677,
          "merkle_root": "018f62bea2b90fe50ea0e6fd75fdd0656631fd0e95be98adf665f2f066b164ef"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-23T00:12:49.197Z",
      "updated_at": "2026-10-23T01:12:49.202Z",
      "bitcoin_block_height": 972677,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6adaa68103d6a543a70bd9b49509898e08458b97e0f891bf75f3f0397cd6b0f25197897e277ea2a6abaa2d3f"
        },
        {
          "type": "bitcoin",
          "block_height": 972677,
          "merkle_root": "018f62bea2b90fe50ea0e6fd75fdd0656631fd0e95be98adf665f2f066b164ef"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "confirmed",
      "submitted_at": "2026-10-23T00:12:49.197Z",
      "updated_at": "2026-10-23T02:12:49.212Z",
      "bitcoin_block_height": 972682,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6adaa682c52e304a704d80b50a4e00f65068d0c9352a652ecc728f3f29f3d16780d6ab02485f7cca9b11d615"
        },
        {
          "type": "bitcoin",
          "block_height": 972682,
          "merkle_root": "12bec322a5f36fa448c540c2e8ac1e0a905806b677a627aef81a6f4cc783c802"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/16/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."
}