{
  "height": 14,
  "block_hash": "4f074183ca945fd43bf666780b348daca82e8e4d21606a521f4a30b23fda5f08",
  "status": "confirmed",
  "bitcoin_block_height": 974874,
  "digest": {
    "alg": "sha256",
    "hex": "4f074183ca945fd43bf666780b348daca82e8e4d21606a521f4a30b23fda5f08",
    "preimage": "block:{\"at\":\"2026-11-06T23:15:18.657Z\",\"entry_count\":2,\"first_seq\":72,\"height\":14,\"key_id\":\"key_a521921c2ba20669\",\"last_seq\":73,\"merkle_root\":\"6522d2dee8f12df730b3ad2d047591f368a7f6bfc602ebc4545edca30d5add46\",\"prev_hash\":\"54b5847dbd04a08b258af1c6f6f5cdca7bff14305a122b64981c7940ede293d2\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-11-06T23:23:33.611Z",
      "updated_at": "2026-11-07T03:28:43.476Z",
      "bitcoin_block_height": 974874,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6aee61769aec0700786bd37501e5e5b837f4eecf72885055a22c5d065ee2963b01dca19d8df32faac06d2271"
        },
        {
          "type": "bitcoin",
          "block_height": 974874,
          "merkle_root": "fa522f272a37cb03554d5be30f11a1564362627a0d248c198befb5a303c3a302"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-11-06T23:23:33.611Z",
      "updated_at": "2026-11-07T03:28:43.476Z",
      "bitcoin_block_height": 974877,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6aee61766600a7482571b078fba24b0d7f47e8fe3cc3cd94d37ced7d91c33cfa60e5bcfa00a72c69a2957419"
        },
        {
          "type": "bitcoin",
          "block_height": 974877,
          "merkle_root": "dee625f48434576e86df10e80f2912b1c31b96672232e47e103806c1faef5814"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "confirmed",
      "submitted_at": "2026-11-06T23:23:33.611Z",
      "updated_at": "2026-11-07T03:28:43.476Z",
      "bitcoin_block_height": 974877,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6aee6176b111b0a55064ba8b9fc22b0f94ae1cb09c572390cb3a9790b9117d09f486c1734c169c3ff172b208"
        },
        {
          "type": "bitcoin",
          "block_height": 974877,
          "merkle_root": "dee625f48434576e86df10e80f2912b1c31b96672232e47e103806c1faef5814"
        }
      ]
    }
  ],
  "proof_url": "https://www.a2ally.com/v1/ledger/blocks/14/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."
}