{
  "height": 82,
  "block_hash": "af6b9e7bc5430e09665e82205a06facac72d262116b78b47a37478d01d7e8443",
  "status": "confirmed",
  "bitcoin_block_height": 974883,
  "digest": {
    "alg": "sha256",
    "hex": "af6b9e7bc5430e09665e82205a06facac72d262116b78b47a37478d01d7e8443",
    "preimage": "block:{\"at\":\"2026-11-07T02:29:15.285Z\",\"entry_count\":2,\"first_seq\":182,\"height\":82,\"key_id\":\"key_a521921c2ba20669\",\"last_seq\":183,\"merkle_root\":\"81fd7046a6b93b5280eac07b161d2e38bb28ca89bc32e4287b6cc5390e3445c3\",\"prev_hash\":\"b1dcac2875f4798ed4894f224ad244fa3fb764c62444c2522b72d734722cc9f8\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-11-07T02:38:43.467Z",
      "updated_at": "2026-11-07T04:38:43.483Z",
      "bitcoin_block_height": 974883,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6aee8f340803ced31d41ecc60763c6b5eded9f08ca2222c3fc98ae93414e8ee8e11e5b1a26a72091ab664496"
        },
        {
          "type": "bitcoin",
          "block_height": 974883,
          "merkle_root": "79abb9dd33baad0a1ff37045cc779f6fe1b133a7037999fbd2c996ad78e43b90"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-11-07T02:38:43.467Z",
      "updated_at": "2026-11-07T04:38:43.483Z",
      "bitcoin_block_height": 974883,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6aee8f344f75f25d7c31801b8a51ff7d258b7b4549c8b2f8f6943dac77be271d37bc7c88240de722b8b688d6"
        },
        {
          "type": "bitcoin",
          "block_height": 974883,
          "merkle_root": "79abb9dd33baad0a1ff37045cc779f6fe1b133a7037999fbd2c996ad78e43b90"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "pending",
      "submitted_at": "2026-11-07T02:38:43.467Z",
      "updated_at": "2026-11-07T02:38:43.467Z",
      "bitcoin_block_height": null,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6aee8f347df3c7626ed2561352b8f39aa583b02a0a07c6a588ed920cae92853c4d15662dd494df444c1c36c2"
        }
      ]
    }
  ],
  "proof_url": "https://www.a2ally.com/v1/ledger/blocks/82/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."
}