{
  "height": 84,
  "block_hash": "735ccb11f313c42bdf2d9ddd65e2d7598a3e2a0d32972695effa8edeade82709",
  "status": "confirmed",
  "bitcoin_block_height": 974883,
  "digest": {
    "alg": "sha256",
    "hex": "735ccb11f313c42bdf2d9ddd65e2d7598a3e2a0d32972695effa8edeade82709",
    "preimage": "block:{\"at\":\"2026-11-07T02:34:15.304Z\",\"entry_count\":2,\"first_seq\":185,\"height\":84,\"key_id\":\"key_a521921c2ba20669\",\"last_seq\":186,\"merkle_root\":\"576d8849643540069b4c208438acbc3c057edbc9b247c22187ae508e1249f076\",\"prev_hash\":\"c960ea3dcec0bd6f1b6a37abb9ce52b31479d217c64488ae9305ea830719c8d1\",\"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": "6aee8f36e4699acf07ff0a7bf7c896410ada1daa6b33a45f0b2995f4c520edec167cc6b19d6208c3111b60b5"
        },
        {
          "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": "6aee8f363f2ae0f841f34bcbb403557c8a6ce00a7ce7bb5164553b7080e82b3293786ae4bfe76a2be7fb5ce6"
        },
        {
          "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": "6aee8f36fc07a5cd6e2c8681473c6f832b0937ec359f85942d415a23d9a4a962fce94f872d3383453ac6a943"
        }
      ]
    }
  ],
  "proof_url": "https://www.a2ally.com/v1/ledger/blocks/84/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."
}