{
  "height": 79,
  "block_hash": "4b65966ca977071c26b79caa38e5818b4305fe0eb9625c7994515338930d1391",
  "status": "confirmed",
  "bitcoin_block_height": 974880,
  "digest": {
    "alg": "sha256",
    "hex": "4b65966ca977071c26b79caa38e5818b4305fe0eb9625c7994515338930d1391",
    "preimage": "block:{\"at\":\"2026-11-07T02:21:15.270Z\",\"entry_count\":1,\"first_seq\":177,\"height\":79,\"key_id\":\"key_a521921c2ba20669\",\"last_seq\":177,\"merkle_root\":\"6adc822b658730db498308c1311ee23a02be904cc1bf6765850431cd7364cda0\",\"prev_hash\":\"77e2c501c67098511d57d53cf6593e9e1e7c6004e136f370b7b05ddd98408f8d\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-11-07T02:28:43.466Z",
      "updated_at": "2026-11-07T04:28:43.481Z",
      "bitcoin_block_height": 974880,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6aee8cdd80725a37ec0c87c0e541e9406c3c710afb2172564692de46bd5465691c7b7d00fcc9938f50569793"
        },
        {
          "type": "bitcoin",
          "block_height": 974880,
          "merkle_root": "e20917e92c25ba0bebbc60b5b7fe48f0ee84f05c3eb4987c3107d249f2c7113d"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-11-07T02:28:43.466Z",
      "updated_at": "2026-11-07T04:28:43.481Z",
      "bitcoin_block_height": 974883,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6aee8cdd4b5b4a270bdac74a0f14aad71683d60c8ce0bff1c50a46b5aa83cdfc18c4fe53f6903eaffc34bbb0"
        },
        {
          "type": "bitcoin",
          "block_height": 974883,
          "merkle_root": "79abb9dd33baad0a1ff37045cc779f6fe1b133a7037999fbd2c996ad78e43b90"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "pending",
      "submitted_at": "2026-11-07T02:28:43.466Z",
      "updated_at": "2026-11-07T02:28:43.466Z",
      "bitcoin_block_height": null,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6aee8cdd9896f993a75a4605575e18c407a1c3358db50548bf8d692b66d464998cc82ee9ffaf56a2481392bb"
        }
      ]
    }
  ],
  "proof_url": "https://www.a2ally.com/v1/ledger/blocks/79/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."
}