{
  "height": 34,
  "block_hash": "acf7be36eb472b60c9705b2b3af5d8e9c99c5729dc055b665a10c7124003e5b1",
  "status": "confirmed",
  "bitcoin_block_height": 974874,
  "digest": {
    "alg": "sha256",
    "hex": "acf7be36eb472b60c9705b2b3af5d8e9c99c5729dc055b665a10c7124003e5b1",
    "preimage": "block:{\"at\":\"2026-11-07T00:34:14.342Z\",\"entry_count\":2,\"first_seq\":109,\"height\":34,\"key_id\":\"key_a521921c2ba20669\",\"last_seq\":110,\"merkle_root\":\"d1e13243f85aa3e27fa5da8ac22875a2d3419bef86798bfd31c35886ca359197\",\"prev_hash\":\"4ff56e77792954e2401fd845f4988dabfe50079546d4bfda0893a1bcab2c3dd5\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-11-07T00:38:43.455Z",
      "updated_at": "2026-11-07T02:38:43.467Z",
      "bitcoin_block_height": 974874,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6aee73162cff8b352ac72e64763a88d14a5a9a090c4666eff1c786e46c327d0dbda7f28f0257cf1ffcf18038"
        },
        {
          "type": "bitcoin",
          "block_height": 974874,
          "merkle_root": "fa522f272a37cb03554d5be30f11a1564362627a0d248c198befb5a303c3a302"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-11-07T00:38:43.455Z",
      "updated_at": "2026-11-07T03:38:43.477Z",
      "bitcoin_block_height": 974877,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6aee73164a002a1688909fa357d83a446e56756c6981614f4766f39af3d72c5431a238745a6f27d1509401a2"
        },
        {
          "type": "bitcoin",
          "block_height": 974877,
          "merkle_root": "dee625f48434576e86df10e80f2912b1c31b96672232e47e103806c1faef5814"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "confirmed",
      "submitted_at": "2026-11-07T00:38:43.455Z",
      "updated_at": "2026-11-07T03:38:43.477Z",
      "bitcoin_block_height": 974877,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6aee731609c581d1456766252082ff7cd021a25fb3ec9744a6a6fa86c91aa95b969b347575cce35271304772"
        },
        {
          "type": "bitcoin",
          "block_height": 974877,
          "merkle_root": "dee625f48434576e86df10e80f2912b1c31b96672232e47e103806c1faef5814"
        }
      ]
    }
  ],
  "proof_url": "https://www.a2ally.com/v1/ledger/blocks/34/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."
}