{
  "height": 97,
  "block_hash": "278516bd56cc353ab721667c64a42721e4218dfc14dbd14d5a8b84f0e623f11d",
  "status": "confirmed",
  "bitcoin_block_height": 974888,
  "digest": {
    "alg": "sha256",
    "hex": "278516bd56cc353ab721667c64a42721e4218dfc14dbd14d5a8b84f0e623f11d",
    "preimage": "block:{\"at\":\"2026-11-07T03:05:45.369Z\",\"entry_count\":1,\"first_seq\":205,\"height\":97,\"key_id\":\"key_a521921c2ba20669\",\"last_seq\":205,\"merkle_root\":\"b41684fb861c8d46d113a38820eaa5c06ed8960129721348aed5468391667f9e\",\"prev_hash\":\"ef12c14cd6ca0b63bf6a886133fcfabfaea2b68b775964d8b5f5d6bedf082d2d\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-11-07T03:08:43.475Z",
      "updated_at": "2026-11-07T05:08:43.485Z",
      "bitcoin_block_height": 974888,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6aee963fab2811f5bc0f636c572c699fa802dca49e56c4e18000d8cbac742cbc112a30a910509c033574a8f1"
        },
        {
          "type": "bitcoin",
          "block_height": 974888,
          "merkle_root": "a373ea77dcacd26df989734c2bed34895920c60a915ed91eb73aa06c53238081"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-11-07T03:08:43.475Z",
      "updated_at": "2026-11-07T05:08:43.485Z",
      "bitcoin_block_height": 974888,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6aee963f661e1c0cd89c5fbf846f124fd1ae0081bd1ffd51a110d3d6ad3a33224e7cad765cca36d74c96e006"
        },
        {
          "type": "bitcoin",
          "block_height": 974888,
          "merkle_root": "a373ea77dcacd26df989734c2bed34895920c60a915ed91eb73aa06c53238081"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "pending",
      "submitted_at": "2026-11-07T03:08:43.475Z",
      "updated_at": "2026-11-07T03:08:43.475Z",
      "bitcoin_block_height": null,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6aee963fa202c603899a3ec591ea912b046cfe0ca602667d8f864422680c52b14b45080d80545348c6d1ba3f"
        }
      ]
    }
  ],
  "proof_url": "https://www.a2ally.com/v1/ledger/blocks/97/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."
}