{
  "height": 46,
  "block_hash": "b9bbca5a5553ab73a603467ee4fa2866c41c06d80d245a82b79f99ebc1d28993",
  "status": "confirmed",
  "bitcoin_block_height": 974874,
  "digest": {
    "alg": "sha256",
    "hex": "b9bbca5a5553ab73a603467ee4fa2866c41c06d80d245a82b79f99ebc1d28993",
    "preimage": "block:{\"at\":\"2026-11-07T01:01:59.975Z\",\"entry_count\":1,\"first_seq\":127,\"height\":46,\"key_id\":\"key_a521921c2ba20669\",\"last_seq\":127,\"merkle_root\":\"a53b5a59408e1d8ac95bc4d33ac896f23f3a9a66558f7baea4010942623909f0\",\"prev_hash\":\"46f492861fec9033a4d6b5dbec60b11e1f8a1418e05ea8468c21659d359469a0\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-11-07T01:08:43.458Z",
      "updated_at": "2026-11-07T03:08:43.475Z",
      "bitcoin_block_height": 974874,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6aee7a1dd3a48953a8c57797b3e2659f5bdec4adabe6386021beb89a9081927f30ca2f49d7a482f3a696fd14"
        },
        {
          "type": "bitcoin",
          "block_height": 974874,
          "merkle_root": "fa522f272a37cb03554d5be30f11a1564362627a0d248c198befb5a303c3a302"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-11-07T01:08:43.458Z",
      "updated_at": "2026-11-07T03:08:43.475Z",
      "bitcoin_block_height": 974877,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6aee7a1d5f27adb43ef98bf6b7df7a425bde50b981b4f3091a110f58d64d04daea9996b5a5c5d25d2a6b4238"
        },
        {
          "type": "bitcoin",
          "block_height": 974877,
          "merkle_root": "dee625f48434576e86df10e80f2912b1c31b96672232e47e103806c1faef5814"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "confirmed",
      "submitted_at": "2026-11-07T01:08:43.458Z",
      "updated_at": "2026-11-07T03:08:43.475Z",
      "bitcoin_block_height": 974877,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6aee7a1d549258fb12793f44022c91cef7e20008e1244f01d48bee25bb3336091642d2a2a54efc0280706744"
        },
        {
          "type": "bitcoin",
          "block_height": 974877,
          "merkle_root": "dee625f48434576e86df10e80f2912b1c31b96672232e47e103806c1faef5814"
        }
      ]
    }
  ],
  "proof_url": "https://www.a2ally.com/v1/ledger/blocks/46/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."
}