{
  "height": 86,
  "block_hash": "c0b7271eeab33d7c12e538a4c28297729e64c6d285d3bc83b5ff8b110e2135e1",
  "status": "confirmed",
  "bitcoin_block_height": 974883,
  "digest": {
    "alg": "sha256",
    "hex": "c0b7271eeab33d7c12e538a4c28297729e64c6d285d3bc83b5ff8b110e2135e1",
    "preimage": "block:{\"at\":\"2026-11-07T02:39:15.311Z\",\"entry_count\":2,\"first_seq\":188,\"height\":86,\"key_id\":\"key_a521921c2ba20669\",\"last_seq\":189,\"merkle_root\":\"1d6334a7f1b25bff1f3505b8cdf91108a745d8534134ea2404148fea0d42628b\",\"prev_hash\":\"ef427b3773407921480fd312246c76509ae34d7bb3d6175e6e6911c5d112c982\",\"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": "6aee918c8f8c4869be51b81bd21ee01d664b5c44347fd7be4a1a1d96b1bc503b5e9fd89de433bad421583fbe"
        },
        {
          "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": "6aee918c3590c62a9af66aa0eae95e8152372ba1cddaee3d6852f82e5ecb57a353998d429fa67bf2d0313574"
        },
        {
          "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": "6aee918cbf71b9cd7bcf93e46da40738886a7e11329bdaa90f2085cbb2df95b17a92a034ecf880e47384bf5f"
        }
      ]
    }
  ],
  "proof_url": "https://www.a2ally.com/v1/ledger/blocks/86/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."
}