{
  "height": 100,
  "block_hash": "94d5079cd2953aac1a91553c1f3a3c44ac1ff8534498c9bc07ad5d99dd7e8dc2",
  "status": "confirmed",
  "bitcoin_block_height": 974888,
  "digest": {
    "alg": "sha256",
    "hex": "94d5079cd2953aac1a91553c1f3a3c44ac1ff8534498c9bc07ad5d99dd7e8dc2",
    "preimage": "block:{\"at\":\"2026-11-07T03:14:15.420Z\",\"entry_count\":2,\"first_seq\":209,\"height\":100,\"key_id\":\"key_a521921c2ba20669\",\"last_seq\":210,\"merkle_root\":\"0bdff80259ffbacf5b30757eaf46dc819882a6ac29a64975bcbf2a2aec6dab79\",\"prev_hash\":\"01e36dc3e6addc381f08ef4b76591910e805cd99064c1dafcb60818a129e597c\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-11-07T03:18:43.476Z",
      "updated_at": "2026-11-07T05:18:43.485Z",
      "bitcoin_block_height": 974888,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6aee98962eba05c3efb1cb2b81fe5ac825f5447d45877b6ac79effbe4a953ffb4a8eea620e6f74691c0ccaea"
        },
        {
          "type": "bitcoin",
          "block_height": 974888,
          "merkle_root": "a373ea77dcacd26df989734c2bed34895920c60a915ed91eb73aa06c53238081"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-11-07T03:18:43.476Z",
      "updated_at": "2026-11-07T05:18:43.485Z",
      "bitcoin_block_height": 974888,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6aee98968bc7b2c17093286dcf69b1e412a1098b84ebd558a44b7f1e5971f860462c41a767f2fe45a5b57389"
        },
        {
          "type": "bitcoin",
          "block_height": 974888,
          "merkle_root": "a373ea77dcacd26df989734c2bed34895920c60a915ed91eb73aa06c53238081"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "pending",
      "submitted_at": "2026-11-07T03:18:43.476Z",
      "updated_at": "2026-11-07T03:18:43.476Z",
      "bitcoin_block_height": null,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6aee98965929045c56d8340b2bd791a080f73a324f295b4988242da2c42412da4796a4142150569ac6627047"
        }
      ]
    }
  ],
  "proof_url": "https://www.a2ally.com/v1/ledger/blocks/100/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."
}