{
  "height": 89,
  "block_hash": "036efb712626a7de2a4e0db28bc3b99cbceb813240dad631969f8522df55166d",
  "status": "confirmed",
  "bitcoin_block_height": 974883,
  "digest": {
    "alg": "sha256",
    "hex": "036efb712626a7de2a4e0db28bc3b99cbceb813240dad631969f8522df55166d",
    "preimage": "block:{\"at\":\"2026-11-07T02:45:45.328Z\",\"entry_count\":1,\"first_seq\":193,\"height\":89,\"key_id\":\"key_a521921c2ba20669\",\"last_seq\":193,\"merkle_root\":\"74c5e0186998ee691e7ea32240ef40bb934451473e0382fdcbc83d514febc2eb\",\"prev_hash\":\"4cb374fc5305492f62236d1a9e647bf57e7f8aba7f5d523f758d61fb1a3214b2\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-11-07T02:48:43.467Z",
      "updated_at": "2026-11-07T04:48:43.485Z",
      "bitcoin_block_height": 974883,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6aee918f1db628f6cc328a6223d6213924d63f6225c401b14389d4bd01cf3cb11574352b39875af9da584f42"
        },
        {
          "type": "bitcoin",
          "block_height": 974883,
          "merkle_root": "79abb9dd33baad0a1ff37045cc779f6fe1b133a7037999fbd2c996ad78e43b90"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-11-07T02:48:43.467Z",
      "updated_at": "2026-11-07T04:48:43.485Z",
      "bitcoin_block_height": 974883,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6aee918f8305c9c7c05f4d11ddfb76273e9266a36c43fc2070ca8a8fb7bf67dc2d8a40728bfa4cef0c3cafda"
        },
        {
          "type": "bitcoin",
          "block_height": 974883,
          "merkle_root": "79abb9dd33baad0a1ff37045cc779f6fe1b133a7037999fbd2c996ad78e43b90"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "pending",
      "submitted_at": "2026-11-07T02:48:43.467Z",
      "updated_at": "2026-11-07T02:48:43.467Z",
      "bitcoin_block_height": null,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6aee918fe765f4fe9da084da31c6fde3fb52601ba2a5b602d6c735a1845d17d803acf0f0af268eb526aac6e7"
        }
      ]
    }
  ],
  "proof_url": "https://www.a2ally.com/v1/ledger/blocks/89/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."
}