{
  "height": 173,
  "block_hash": "6287476df5e10f92ad08c591f7ac7c33e9b0627104fbdf0be1acd5cc04708d76",
  "status": "confirmed",
  "bitcoin_block_height": 973017,
  "digest": {
    "alg": "sha256",
    "hex": "6287476df5e10f92ad08c591f7ac7c33e9b0627104fbdf0be1acd5cc04708d76",
    "preimage": "block:{\"at\":\"2026-10-25T04:09:21.380Z\",\"entry_count\":2,\"first_seq\":218,\"height\":173,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":219,\"merkle_root\":\"16364ca01b4c7bbe873985fefb9150af31cb86fb9e3168a9b1c29e2ce48d83bc\",\"prev_hash\":\"c87c4d0a75e3b42c810957841882003da650c876ca1c6cdf888451365f2fd409\",\"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": "6add832b1f038d1369df37db8aa6c9955befeac2ca739e94c8f3331bf2417815eb98565c1c3cad70ae3a1f9a"
        },
        {
          "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": "6add832bd81dabd4284ed1d764569c4e97d945bdd4bfabf754be4047c47ba31cf1e9d6563f68fc50f7727314"
        },
        {
          "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": "6add832b34c6031785d5f5b85085d0de4166fbbc4b0c28ecaa4c5af36be9943f21d1a953ef9ef2af14e8d37d"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/173/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."
}