{
  "id": "cyber-apocalypse-2023-blokechain",
  "title": "Challenge archive: HTB Cyber Apocalypse 2023 - Blokechain",
  "challenge_name": "Blokechain",
  "year": 2023,
  "category": "Cryptography",
  "authors": [
    "deuterium"
  ],
  "mode": "interactive",
  "event": {
    "id": "cyber-apocalypse-2023",
    "series": "Hack The Box",
    "label": "Cyber Apocalypse 2023",
    "starts_at": "2023-03-18T13:00:00+00:00",
    "date_source": "https://ctftime.org/event/1889",
    "year": 2023
  },
  "article_url": "https://deut-erium.github.io/challenges/cyber-apocalypse-2023/blokechain/",
  "article_path": "/challenges/cyber-apocalypse-2023/blokechain/",
  "text_url": "https://deut-erium.github.io/challenges/cyber-apocalypse-2023/blokechain/challenge.txt",
  "text_path": "/challenges/cyber-apocalypse-2023/blokechain/challenge.txt",
  "json_url": "https://deut-erium.github.io/challenges/cyber-apocalypse-2023/blokechain/challenge.json",
  "json_path": "/challenges/cyber-apocalypse-2023/blokechain/challenge.json",
  "statement": {
    "label": "Summary",
    "text": "Mine blocks against a private hash function and earn enough to destroy the vessels."
  },
  "notes": [
    "The handout contains server.py and prints a placeholder when you win; it does not include the event flag.",
    "This copy comes from Cyberkarta's community archive, not an official HTB repository. The original remote service is retired; browser practice runs locally with a public dummy reward.",
    "The original remote service is retired. Browser practice runs locally with the public dummy reward practice{local_dummy_reward}, not an event flag or authoritative score. No TCP endpoint is provided."
  ],
  "files": [
    {
      "name": "crypto_blokechain.zip",
      "label": "crypto_blokechain.zip",
      "kind": "handout",
      "url": "https://deut-erium.github.io/assets/challenges/cyber-apocalypse-2023-blokechain/crypto_blokechain.zip",
      "path": "/assets/challenges/cyber-apocalypse-2023-blokechain/crypto_blokechain.zip",
      "bytes": 1642,
      "sha256": "b26190c3145eeadfb318487d410986baee6758d12c414ad297044626a9f68455",
      "upstream_url": "https://raw.githubusercontent.com/cyberkarta/HTBCyberApocalypse2023/d3fc66c54303eb6f2a6cd831c786f054bb8214c6/crypto_blokechain.zip"
    }
  ],
  "spoilers": {
    "warning": "Spoilers: organizer files and upstream source, archive, or solution links may reveal answers. Modified downloads are identified below.",
    "files": [

    ],
    "source_url": "https://github.com/cyberkarta/HTBCyberApocalypse2023/blob/d3fc66c54303eb6f2a6cd831c786f054bb8214c6/crypto_blokechain.zip",
    "archive_url": "https://github.com/cyberkarta/HTBCyberApocalypse2023/tree/d3fc66c54303eb6f2a6cd831c786f054bb8214c6"
  },
  "licenses": [

  ],
  "browser_practice": {
    "runtime": "blokechain",
    "variants": [
      "default"
    ],
    "launch_url": "https://deut-erium.github.io/challenges/cyber-apocalypse-2023/blokechain/#browser-practice",
    "launch_path": "/challenges/cyber-apocalypse-2023/blokechain/#browser-practice"
  }
}