{
  "height": 85,
  "block_hash": "ef427b3773407921480fd312246c76509ae34d7bb3d6175e6e6911c5d112c982",
  "status": "confirmed",
  "bitcoin_block_height": 974883,
  "digest": {
    "alg": "sha256",
    "hex": "ef427b3773407921480fd312246c76509ae34d7bb3d6175e6e6911c5d112c982",
    "preimage": "block:{\"at\":\"2026-11-07T02:36:00.307Z\",\"entry_count\":1,\"first_seq\":187,\"height\":85,\"key_id\":\"key_a521921c2ba20669\",\"last_seq\":187,\"merkle_root\":\"c341bdad28e9da66d2ae37c27dae9c41455e1458b022562c744709c8e05dcf52\",\"prev_hash\":\"735ccb11f313c42bdf2d9ddd65e2d7598a3e2a0d32972695effa8edeade82709\",\"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": "6aee8f37d0b3916dfce4d62dac820f60a33b4959ad6b971c1ce16b2b01970a9fdaed97fdce9754a055c54c8c"
        },
        {
          "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": "6aee8f37a1149598e8de92c2808d3c219c630b8de7bfa01530b675491deb3246a0ba2d96753c79c69928ed83"
        },
        {
          "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": "6aee8f37e1edb345158717e20afd54d94b77dffc5848e1afda6f99ce5800daf8f57c5527e48616400b7528ac"
        }
      ]
    }
  ],
  "proof_url": "https://www.a2ally.com/v1/ledger/blocks/85/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."
}