{
  "height": 5,
  "block_hash": "ac5123c6e0feb8edf41b3bca3ed9fc93aeeb530ef47b67e022c9d68fbb966e10",
  "status": "confirmed",
  "bitcoin_block_height": 974874,
  "digest": {
    "alg": "sha256",
    "hex": "ac5123c6e0feb8edf41b3bca3ed9fc93aeeb530ef47b67e022c9d68fbb966e10",
    "preimage": "block:{\"at\":\"2026-11-06T22:30:18.468Z\",\"entry_count\":2,\"first_seq\":54,\"height\":5,\"key_id\":\"key_a521921c2ba20669\",\"last_seq\":55,\"merkle_root\":\"ef52359a561c226f4a7306c07a16a5f34b2c44408583d2b87f6811c7f2a5bc1f\",\"prev_hash\":\"c6fbc96265961f34d7f5286ed4bb91d7817caa31c35fe928cd7f13593b1258e6\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-11-06T22:34:47.904Z",
      "updated_at": "2026-11-07T03:08:43.475Z",
      "bitcoin_block_height": 974874,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6aee560abaf1a344584c67a77f0ebe5becdcc6b8c21b94c199790bb32b1b8e2271a415d15d3d09ef2c52defd"
        },
        {
          "type": "bitcoin",
          "block_height": 974874,
          "merkle_root": "fa522f272a37cb03554d5be30f11a1564362627a0d248c198befb5a303c3a302"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-11-06T22:34:47.904Z",
      "updated_at": "2026-11-07T03:08:43.475Z",
      "bitcoin_block_height": 974877,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6aee56094894c47f463b3a5ff636dd94eb6d9ee8b3165f90d422f4dd35a04679d0b513074af4d9e40242bd1e"
        },
        {
          "type": "bitcoin",
          "block_height": 974877,
          "merkle_root": "dee625f48434576e86df10e80f2912b1c31b96672232e47e103806c1faef5814"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "confirmed",
      "submitted_at": "2026-11-06T22:34:47.904Z",
      "updated_at": "2026-11-07T03:08:43.475Z",
      "bitcoin_block_height": 974877,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6aee5609a8a800c01e615b09255780949251f9048423993b663acdda6a29f0877ffccef772179a3d7c557639"
        },
        {
          "type": "bitcoin",
          "block_height": 974877,
          "merkle_root": "dee625f48434576e86df10e80f2912b1c31b96672232e47e103806c1faef5814"
        }
      ]
    }
  ],
  "proof_url": "https://www.a2ally.com/v1/ledger/blocks/5/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."
}