{
  "height": 88,
  "block_hash": "4cb374fc5305492f62236d1a9e647bf57e7f8aba7f5d523f758d61fb1a3214b2",
  "status": "confirmed",
  "bitcoin_block_height": 974883,
  "digest": {
    "alg": "sha256",
    "hex": "4cb374fc5305492f62236d1a9e647bf57e7f8aba7f5d523f758d61fb1a3214b2",
    "preimage": "block:{\"at\":\"2026-11-07T02:44:15.322Z\",\"entry_count\":2,\"first_seq\":191,\"height\":88,\"key_id\":\"key_a521921c2ba20669\",\"last_seq\":192,\"merkle_root\":\"797c2ce7f47a57fdd85b995494e10a12a54ad6301b3aed71498e1fd71540fb1c\",\"prev_hash\":\"f185bc791594f6360ea4641125bbd8b3158363646ce1f5fc20d46f2d31afefe4\",\"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": "6aee918e718822f1988c0b4ddd18dc33a273147cdb66d9e713ca1f3f1953a2e67a4b40c6afaf3e00cdc31239"
        },
        {
          "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": "6aee918e066d7fc1fa10514460b4ccca3d57657c7a475d6dc858b1f92259281ce613c0974d6b01d063dcbd3d"
        },
        {
          "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": "6aee918e77429b8e194da093ffa087d2a429af53882837ea9b291488e9dce3cb329287beb7e9deb71ad1e3c4"
        }
      ]
    }
  ],
  "proof_url": "https://www.a2ally.com/v1/ledger/blocks/88/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."
}