{
  "height": 10,
  "block_hash": "b17b8d2dadfb6e164e01ffd5e9ba481c2c520ffa33c2ee1eafd7aca4b3ef75a2",
  "status": "confirmed",
  "bitcoin_block_height": 974874,
  "digest": {
    "alg": "sha256",
    "hex": "b17b8d2dadfb6e164e01ffd5e9ba481c2c520ffa33c2ee1eafd7aca4b3ef75a2",
    "preimage": "block:{\"at\":\"2026-11-06T22:55:18.516Z\",\"entry_count\":2,\"first_seq\":64,\"height\":10,\"key_id\":\"key_a521921c2ba20669\",\"last_seq\":65,\"merkle_root\":\"54b341483bd7078d3ede289cfb579aa787829d944d60272f7919a3756e3097a0\",\"prev_hash\":\"1147e6b088d9b71e7e67aa37c8651efdd40ed17a1e3fbf35758da40f56227509\",\"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": "6aee5d1070d77cd59c1ddf9470da68fab07bf623433ff9081214300152cb0f54e687eda8ec31b2a3ae23cb6e"
        },
        {
          "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": "6aee5d108f68b30896f24bd67b4f0f7a8a1c3190d09ed1a56a7287893f6d92035faee874eaa35b507112cfaf"
        },
        {
          "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": "6aee5d1014b0de4efe01553b57c36eeea214de8d9ed136becbc458a6366c6feb4de874f26ae25bb878be64c4"
        },
        {
          "type": "bitcoin",
          "block_height": 974877,
          "merkle_root": "dee625f48434576e86df10e80f2912b1c31b96672232e47e103806c1faef5814"
        }
      ]
    }
  ],
  "proof_url": "https://www.a2ally.com/v1/ledger/blocks/10/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."
}