{
  "height": 11,
  "block_hash": "55c169560b3da22c9790809f174d29d031a4217b8a7b938425e27d5dc4568d13",
  "status": "confirmed",
  "bitcoin_block_height": 974874,
  "digest": {
    "alg": "sha256",
    "hex": "55c169560b3da22c9790809f174d29d031a4217b8a7b938425e27d5dc4568d13",
    "preimage": "block:{\"at\":\"2026-11-06T23:00:18.556Z\",\"entry_count\":2,\"first_seq\":66,\"height\":11,\"key_id\":\"key_a521921c2ba20669\",\"last_seq\":67,\"merkle_root\":\"e18a913d8815bf2e8d2e2de3a50b98a5fc10195f9d2ef30f240731e9430579ed\",\"prev_hash\":\"b17b8d2dadfb6e164e01ffd5e9ba481c2c520ffa33c2ee1eafd7aca4b3ef75a2\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-11-06T23:04:47.915Z",
      "updated_at": "2026-11-07T03:08:43.475Z",
      "bitcoin_block_height": 974874,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6aee5d1122234286b4003aa666fd5f6d8ae1951d678d97a5b393f5ec1df4104037434090f492af07fc75ad2c"
        },
        {
          "type": "bitcoin",
          "block_height": 974874,
          "merkle_root": "fa522f272a37cb03554d5be30f11a1564362627a0d248c198befb5a303c3a302"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-11-06T23:04:47.915Z",
      "updated_at": "2026-11-07T03:08:43.475Z",
      "bitcoin_block_height": 974877,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6aee5d114326f0241de9003455f4dbd2bb6efa1660f245d740499382da0a4920779f7563ab7bd6d32e7b3146"
        },
        {
          "type": "bitcoin",
          "block_height": 974877,
          "merkle_root": "dee625f48434576e86df10e80f2912b1c31b96672232e47e103806c1faef5814"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "confirmed",
      "submitted_at": "2026-11-06T23:04:47.915Z",
      "updated_at": "2026-11-07T03:08:43.475Z",
      "bitcoin_block_height": 974877,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6aee5d11fb3443c17c86566395684d95b153c96d9aa70bbebe420a1bf64d8cb90128a5f03012993ad6575e04"
        },
        {
          "type": "bitcoin",
          "block_height": 974877,
          "merkle_root": "dee625f48434576e86df10e80f2912b1c31b96672232e47e103806c1faef5814"
        }
      ]
    }
  ],
  "proof_url": "https://www.a2ally.com/v1/ledger/blocks/11/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."
}