{
  "height": 25,
  "block_hash": "47d88c72f3ef4caf6ceb83f0e1e7dc897f18f1270d84078707bfbc3048986098",
  "status": "confirmed",
  "bitcoin_block_height": 974874,
  "digest": {
    "alg": "sha256",
    "hex": "47d88c72f3ef4caf6ceb83f0e1e7dc897f18f1270d84078707bfbc3048986098",
    "preimage": "block:{\"at\":\"2026-11-06T23:59:28.464Z\",\"entry_count\":1,\"first_seq\":93,\"height\":25,\"key_id\":\"key_a521921c2ba20669\",\"last_seq\":93,\"merkle_root\":\"2fbd34ebfae1f424dc31c175f78e63c09a830ef1b1ab65f73c969659354de036\",\"prev_hash\":\"6af17e9c0b5c3be39d1d55ddf22f4cfd980724be121c55e12d2f444dac0a7cf6\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-11-07T00:08:43.449Z",
      "updated_at": "2026-11-07T03:08:43.475Z",
      "bitcoin_block_height": 974874,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6aee6c0c59be2f49f7ddf3d7e0906f435d305e5d53fd8e215681785d89fd557970da8a873143dcfacfead36e"
        },
        {
          "type": "bitcoin",
          "block_height": 974874,
          "merkle_root": "fa522f272a37cb03554d5be30f11a1564362627a0d248c198befb5a303c3a302"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-11-07T00:08:43.449Z",
      "updated_at": "2026-11-07T03:08:43.475Z",
      "bitcoin_block_height": 974877,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6aee6c0ce1c982f98de0cd38842f1759a3fe2d2d0642b3c01a2a2cc9bd61d1fb8be4a83872bcf25161452d4e"
        },
        {
          "type": "bitcoin",
          "block_height": 974877,
          "merkle_root": "dee625f48434576e86df10e80f2912b1c31b96672232e47e103806c1faef5814"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "confirmed",
      "submitted_at": "2026-11-07T00:08:43.449Z",
      "updated_at": "2026-11-07T03:08:43.475Z",
      "bitcoin_block_height": 974877,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6aee6c0ccc132863a51739e0e990ef49d29c6aae6c6c36dc0ead7d560e3a01d817bc405419ec6f12f22e577a"
        },
        {
          "type": "bitcoin",
          "block_height": 974877,
          "merkle_root": "dee625f48434576e86df10e80f2912b1c31b96672232e47e103806c1faef5814"
        }
      ]
    }
  ],
  "proof_url": "https://www.a2ally.com/v1/ledger/blocks/25/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."
}