{
  "height": 170,
  "block_hash": "88593add7819f3e63adf7a4df480b4fc64cf9fa089a298cf7146b48ff378fe5f",
  "status": "confirmed",
  "bitcoin_block_height": 973013,
  "digest": {
    "alg": "sha256",
    "hex": "88593add7819f3e63adf7a4df480b4fc64cf9fa089a298cf7146b48ff378fe5f",
    "preimage": "block:{\"at\":\"2026-10-25T03:54:21.282Z\",\"entry_count\":2,\"first_seq\":212,\"height\":170,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":213,\"merkle_root\":\"864798d57588edd3e28106b67ea2f888a58a05e53dc4154f2632cf8389c1e661\",\"prev_hash\":\"55529741772b45d00b3b8747525611d0655fe64b9cd6861fbcf9a4a424428e88\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-25T03:58:50.518Z",
      "updated_at": "2026-10-25T05:00:23.356Z",
      "bitcoin_block_height": 973013,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6add7e7c47d8ddf98c17f870d79a4324732b80de4302604692be64b251088845de90135667eac24bcccbe239"
        },
        {
          "type": "bitcoin",
          "block_height": 973013,
          "merkle_root": "3d312df43b8546a3f616c3e18e55a3b1a2799f5b24b1917bcd798bf615499c58"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-25T03:58:50.518Z",
      "updated_at": "2026-10-25T05:00:23.356Z",
      "bitcoin_block_height": 973013,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6add7e7b374014f91a8dec09dbc7614bfc270f5c55475cff68bca550da8a852929c289efa9f9dfa0d259c51c"
        },
        {
          "type": "bitcoin",
          "block_height": 973013,
          "merkle_root": "3d312df43b8546a3f616c3e18e55a3b1a2799f5b24b1917bcd798bf615499c58"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "pending",
      "submitted_at": "2026-10-25T03:58:50.518Z",
      "updated_at": "2026-10-25T03:58:50.518Z",
      "bitcoin_block_height": null,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6add7e7c590fe07b556dc1ce18ee1567417476fec17c86f022ea6bdcbb8f4ab501101fda4bda4fe60745e60f"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/170/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."
}