{
  "height": 7,
  "block_hash": "9b578624c1d48775a02538294fc183ac9ccc100629db31df41627c324111f75b",
  "status": "confirmed",
  "bitcoin_block_height": 974874,
  "digest": {
    "alg": "sha256",
    "hex": "9b578624c1d48775a02538294fc183ac9ccc100629db31df41627c324111f75b",
    "preimage": "block:{\"at\":\"2026-11-06T22:40:18.488Z\",\"entry_count\":2,\"first_seq\":58,\"height\":7,\"key_id\":\"key_a521921c2ba20669\",\"last_seq\":59,\"merkle_root\":\"341bd062f288fb9f4c977c97cb062798edd772ba7c59ee81eedc379ecd853f2d\",\"prev_hash\":\"ea354cced0a97a2c7952b8892fb1d9139ba73d365334ff98ef10aa0eb5315078\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-11-06T22:44:47.908Z",
      "updated_at": "2026-11-07T03:08:43.475Z",
      "bitcoin_block_height": 974874,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6aee5861e2d81a4cf521c3ba39f646365d3080d8f4ee4543c92ef54e9b30208a7f11cc9abd29350afa19530c"
        },
        {
          "type": "bitcoin",
          "block_height": 974874,
          "merkle_root": "fa522f272a37cb03554d5be30f11a1564362627a0d248c198befb5a303c3a302"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-11-06T22:44:47.908Z",
      "updated_at": "2026-11-07T03:08:43.475Z",
      "bitcoin_block_height": 974877,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6aee586282ae77d2e0edffa9862824a61a7c490744bd45738468ee839cbb6682c3e6a84953a69471512e0a91"
        },
        {
          "type": "bitcoin",
          "block_height": 974877,
          "merkle_root": "dee625f48434576e86df10e80f2912b1c31b96672232e47e103806c1faef5814"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "confirmed",
      "submitted_at": "2026-11-06T22:44:47.908Z",
      "updated_at": "2026-11-07T03:08:43.475Z",
      "bitcoin_block_height": 974877,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6aee5861572be8b630d7b86ad7bfae23f833d9a6370c36d67e4846322824caaacfc6800a4eac82e1c17b5702"
        },
        {
          "type": "bitcoin",
          "block_height": 974877,
          "merkle_root": "dee625f48434576e86df10e80f2912b1c31b96672232e47e103806c1faef5814"
        }
      ]
    }
  ],
  "proof_url": "https://www.a2ally.com/v1/ledger/blocks/7/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."
}