{
  "height": 6,
  "block_hash": "ea354cced0a97a2c7952b8892fb1d9139ba73d365334ff98ef10aa0eb5315078",
  "status": "confirmed",
  "bitcoin_block_height": 974874,
  "digest": {
    "alg": "sha256",
    "hex": "ea354cced0a97a2c7952b8892fb1d9139ba73d365334ff98ef10aa0eb5315078",
    "preimage": "block:{\"at\":\"2026-11-06T22:35:18.484Z\",\"entry_count\":2,\"first_seq\":56,\"height\":6,\"key_id\":\"key_a521921c2ba20669\",\"last_seq\":57,\"merkle_root\":\"77e26bc48000eb56b0e0d89324dc4ed678363ad65888b20b273363a065101102\",\"prev_hash\":\"ac5123c6e0feb8edf41b3bca3ed9fc93aeeb530ef47b67e022c9d68fbb966e10\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-11-06T22:44:47.908Z",
      "updated_at": "2026-11-07T03:08:43.475Z",
      "bitcoin_block_height": 974874,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6aee5860806216e8f399c9b473b97eaf1642c99a58a895d969c6f522cec07b1eb197b966f05ce557e102fa21"
        },
        {
          "type": "bitcoin",
          "block_height": 974874,
          "merkle_root": "fa522f272a37cb03554d5be30f11a1564362627a0d248c198befb5a303c3a302"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-11-06T22:44:47.908Z",
      "updated_at": "2026-11-07T03:08:43.475Z",
      "bitcoin_block_height": 974877,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6aee5861a43139a30771a05da832c5e775919ae42f0f8d0683182fe22bbdbff984082c19193079d95de2018b"
        },
        {
          "type": "bitcoin",
          "block_height": 974877,
          "merkle_root": "dee625f48434576e86df10e80f2912b1c31b96672232e47e103806c1faef5814"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "confirmed",
      "submitted_at": "2026-11-06T22:44:47.908Z",
      "updated_at": "2026-11-07T03:08:43.475Z",
      "bitcoin_block_height": 974877,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6aee5860433e0477d945c1f18d9d892d83fdf0113b83796a7bcc24beacaf3c389bce8a935957a68b6e9630ec"
        },
        {
          "type": "bitcoin",
          "block_height": 974877,
          "merkle_root": "dee625f48434576e86df10e80f2912b1c31b96672232e47e103806c1faef5814"
        }
      ]
    }
  ],
  "proof_url": "https://www.a2ally.com/v1/ledger/blocks/6/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."
}