{
  "height": 1,
  "block_hash": "6f4e1751e75bebf58a757bda61b5d8ff16494ca039a753b47ece4e024eae74de",
  "status": "confirmed",
  "bitcoin_block_height": 974874,
  "digest": {
    "alg": "sha256",
    "hex": "6f4e1751e75bebf58a757bda61b5d8ff16494ca039a753b47ece4e024eae74de",
    "preimage": "block:{\"at\":\"2026-11-06T22:14:47.898Z\",\"entry_count\":34,\"first_seq\":12,\"height\":1,\"key_id\":\"key_a521921c2ba20669\",\"last_seq\":45,\"merkle_root\":\"a78e76bde5f29963718039cdf9f5142ae76de07e663e5df36ec649c5bfe3b27a\",\"prev_hash\":\"0aad1605bfe10fe1370da1ff6dd97a95d382b04e66c402ea3a32bb94016c41a7\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-11-06T22:15:17.913Z",
      "updated_at": "2026-11-07T03:08:43.475Z",
      "bitcoin_block_height": 974874,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6aee5176148d37c17e70d7972f9bb9127b463397de9f5036e78f2205cd380827e2c285abf8be4ed3bb138d5f"
        },
        {
          "type": "bitcoin",
          "block_height": 974874,
          "merkle_root": "fa522f272a37cb03554d5be30f11a1564362627a0d248c198befb5a303c3a302"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-11-06T22:15:17.913Z",
      "updated_at": "2026-11-07T03:08:43.475Z",
      "bitcoin_block_height": 974877,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6aee517750570ba94e2e13b019ab0be719d4e4a7e95f09ca2cfd1282b74d04edc95be70a9065fab8c8502181"
        },
        {
          "type": "bitcoin",
          "block_height": 974877,
          "merkle_root": "dee625f48434576e86df10e80f2912b1c31b96672232e47e103806c1faef5814"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "confirmed",
      "submitted_at": "2026-11-06T22:15:17.913Z",
      "updated_at": "2026-11-07T03:08:43.475Z",
      "bitcoin_block_height": 974877,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6aee5177a9be29d50f4b8a5f0e7c12588584fc941a81756eb93cc8d1b286b1e7a6d2b22cde076ca0ce9c60d3"
        },
        {
          "type": "bitcoin",
          "block_height": 974877,
          "merkle_root": "dee625f48434576e86df10e80f2912b1c31b96672232e47e103806c1faef5814"
        }
      ]
    }
  ],
  "proof_url": "https://www.a2ally.com/v1/ledger/blocks/1/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."
}