{
  "height": 91,
  "block_hash": "5eb7bf34f81a46e42988754cc4636a82cec742ef0c64a1e7e134a66859e33323",
  "status": "confirmed",
  "bitcoin_block_height": 974883,
  "digest": {
    "alg": "sha256",
    "hex": "5eb7bf34f81a46e42988754cc4636a82cec742ef0c64a1e7e134a66859e33323",
    "preimage": "block:{\"at\":\"2026-11-07T02:50:45.340Z\",\"entry_count\":1,\"first_seq\":196,\"height\":91,\"key_id\":\"key_a521921c2ba20669\",\"last_seq\":196,\"merkle_root\":\"8f3bbe261436fd8756618401195f6cf7f87facabd192ad08de1390a9a2e5c587\",\"prev_hash\":\"ed1cee41c6396294da6fd23a7cb889928142f21d56c5ed7fd2a70aaad95571fa\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-11-07T02:58:43.471Z",
      "updated_at": "2026-11-07T04:58:43.484Z",
      "bitcoin_block_height": 974883,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6aee93e50a29d2fd24d8c2e94540b6beec6a1526540d8ce4ef98c21b2afd7b1d0c70be8351516ee552f0c579"
        },
        {
          "type": "bitcoin",
          "block_height": 974883,
          "merkle_root": "79abb9dd33baad0a1ff37045cc779f6fe1b133a7037999fbd2c996ad78e43b90"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-11-07T02:58:43.471Z",
      "updated_at": "2026-11-07T04:58:43.484Z",
      "bitcoin_block_height": 974883,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6aee93e52c98cbdf123ef7f34a3d7de3e113a7a0cf381d40baef9d3ef31b22f9af11558a3da21b9f15c30823"
        },
        {
          "type": "bitcoin",
          "block_height": 974883,
          "merkle_root": "79abb9dd33baad0a1ff37045cc779f6fe1b133a7037999fbd2c996ad78e43b90"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "pending",
      "submitted_at": "2026-11-07T02:58:43.471Z",
      "updated_at": "2026-11-07T02:58:43.471Z",
      "bitcoin_block_height": null,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6aee93e40ec8cca14d66f0c6f6ecfb755f71ef222daed0be6b9f27097303c92c864242b8a9c8d46433c6edb7"
        }
      ]
    }
  ],
  "proof_url": "https://www.a2ally.com/v1/ledger/blocks/91/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."
}