{
  "height": 161,
  "block_hash": "d021d0ab6aee0985881e10b41cad9d9ba456ffecb8c8ed0b72e2a483fa54119d",
  "status": "confirmed",
  "bitcoin_block_height": 973009,
  "digest": {
    "alg": "sha256",
    "hex": "d021d0ab6aee0985881e10b41cad9d9ba456ffecb8c8ed0b72e2a483fa54119d",
    "preimage": "block:{\"at\":\"2026-10-25T03:05:02.604Z\",\"entry_count\":2,\"first_seq\":194,\"height\":161,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":195,\"merkle_root\":\"977cc8c899e538ecc800a0ae5c72781afa66cb337b5a306f30b3f45928bfbb5d\",\"prev_hash\":\"3080bcbd8e46ad3697f472104680eb52bde998c62100d143b3630b4089a18895\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-25T03:09:17.527Z",
      "updated_at": "2026-10-25T04:18:50.520Z",
      "bitcoin_block_height": 973009,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6add72df011f0af9943a35e28bf6c34e486331c73868f72f080b9fcbc471c128afb5288e9774c6cf9715367d"
        },
        {
          "type": "bitcoin",
          "block_height": 973009,
          "merkle_root": "141cf56f7b4558df3d03647f005a747090c85f503425d28edb46d7b28e45ce37"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-25T03:09:17.527Z",
      "updated_at": "2026-10-25T04:18:50.520Z",
      "bitcoin_block_height": 973009,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6add72de38b438f8653d88c034b9ae698955f817138f3df72012fe0798e5b7db4be334b3f05c1048eaedbeae"
        },
        {
          "type": "bitcoin",
          "block_height": 973009,
          "merkle_root": "141cf56f7b4558df3d03647f005a747090c85f503425d28edb46d7b28e45ce37"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "pending",
      "submitted_at": "2026-10-25T03:09:17.527Z",
      "updated_at": "2026-10-25T03:09:17.527Z",
      "bitcoin_block_height": null,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6add72dfd51fa435046dc8546aa724061ffa9dccc256d22f824cdc3c1442a2cc5f8e37ca1d6577fc135fcf0a"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/161/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."
}