{
  "height": 174,
  "block_hash": "a07f76b47267994bf09992dd080932045cd501b1d841263071aee40025544b87",
  "status": "confirmed",
  "bitcoin_block_height": 973017,
  "digest": {
    "alg": "sha256",
    "hex": "a07f76b47267994bf09992dd080932045cd501b1d841263071aee40025544b87",
    "preimage": "block:{\"at\":\"2026-10-25T04:14:21.398Z\",\"entry_count\":2,\"first_seq\":220,\"height\":174,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":221,\"merkle_root\":\"ae4d8d2ec225d4550c61697bc3aa4f9a20fade60780d1627e1808c352ed5a7bc\",\"prev_hash\":\"6287476df5e10f92ad08c591f7ac7c33e9b0627104fbdf0be1acd5cc04708d76\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-25T04:18:50.520Z",
      "updated_at": "2026-10-25T05:20:23.360Z",
      "bitcoin_block_height": 973017,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6add832c65c1726e3ad6d1dc34ace07b446c9b6404fde6f2c6e660268763cb7fd92dba3a8d5b978dc2ed1ae0"
        },
        {
          "type": "bitcoin",
          "block_height": 973017,
          "merkle_root": "b174116b81e9608bde0c4798462f8d8f3715d08d32613a0772f57e0c262b6505"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-25T04:18:50.520Z",
      "updated_at": "2026-10-25T05:20:23.360Z",
      "bitcoin_block_height": 973017,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6add832cf34e35334f11581c2bf9477f657cd31ec83f52cc326fa36a9eb3f1b850e6e9f4912077cc44bd3715"
        },
        {
          "type": "bitcoin",
          "block_height": 973017,
          "merkle_root": "b174116b81e9608bde0c4798462f8d8f3715d08d32613a0772f57e0c262b6505"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "pending",
      "submitted_at": "2026-10-25T04:18:50.520Z",
      "updated_at": "2026-10-25T04:18:50.520Z",
      "bitcoin_block_height": null,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6add832ca891646ea9707f4920241df7ad396fd7339b954dbdc7feb103ca4c1d367a5a051b26b6fe13ccb788"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/174/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."
}