{
  "height": 22,
  "block_hash": "033167808d002e843386c5d8ad1d84e944c3c839205d8d17c916935a3e0b0214",
  "status": "confirmed",
  "bitcoin_block_height": 974874,
  "digest": {
    "alg": "sha256",
    "hex": "033167808d002e843386c5d8ad1d84e944c3c839205d8d17c916935a3e0b0214",
    "preimage": "block:{\"at\":\"2026-11-06T23:53:33.746Z\",\"entry_count\":2,\"first_seq\":88,\"height\":22,\"key_id\":\"key_a521921c2ba20669\",\"last_seq\":89,\"merkle_root\":\"014294fd606b7c10af1a60410fe32dbc1784fdd44ead04b252550f1f2a19976d\",\"prev_hash\":\"bf4d4b3cf7fd652fa2250ad045999d635a875cf12b45003ef4d655a3ff195dd8\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-11-06T23:59:13.453Z",
      "updated_at": "2026-11-07T03:08:43.475Z",
      "bitcoin_block_height": 974874,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6aee69d21489b92ec4944ab554eaa9b3a4106a3b39d04425e0f790775f75adaa68f14240e74597cdaa125c86"
        },
        {
          "type": "bitcoin",
          "block_height": 974874,
          "merkle_root": "fa522f272a37cb03554d5be30f11a1564362627a0d248c198befb5a303c3a302"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-11-06T23:59:13.453Z",
      "updated_at": "2026-11-07T03:08:43.475Z",
      "bitcoin_block_height": 974877,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6aee69d29f78afb40bd7ee3a8c75b9f455022eff713db8778871a58a0024594e13c92bae70b29ac1e4a80900"
        },
        {
          "type": "bitcoin",
          "block_height": 974877,
          "merkle_root": "dee625f48434576e86df10e80f2912b1c31b96672232e47e103806c1faef5814"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "confirmed",
      "submitted_at": "2026-11-06T23:59:13.453Z",
      "updated_at": "2026-11-07T03:08:43.475Z",
      "bitcoin_block_height": 974877,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6aee69d24ef66bc82c1b14853fe4ce232e7a676dadfd6cb6b9b41a956cd1da91c4a1a3723d0c21c8cf5f1aae"
        },
        {
          "type": "bitcoin",
          "block_height": 974877,
          "merkle_root": "dee625f48434576e86df10e80f2912b1c31b96672232e47e103806c1faef5814"
        }
      ]
    }
  ],
  "proof_url": "https://www.a2ally.com/v1/ledger/blocks/22/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."
}