Challenge archive: HTB Cyber Apocalypse 2023 - Blokechain

Challenge: Blokechain
Event: Hack The Box - Cyber Apocalypse 2023
Year: 2023
Category: Cryptography
Authors: deuterium
Mode: interactive
Article: https://deut-erium.github.io/challenges/cyber-apocalypse-2023/blokechain/
Text: https://deut-erium.github.io/challenges/cyber-apocalypse-2023/blokechain/challenge.txt
JSON: https://deut-erium.github.io/challenges/cyber-apocalypse-2023/blokechain/challenge.json

Summary:
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.

Browser practice: https://deut-erium.github.io/challenges/cyber-apocalypse-2023/blokechain/#browser-practice
Runtime: blokechain
Variants: default (first is default)
Mode describes the original interactive I/O. Start practice from the article, not a TCP client.

Challenge files (primary):
- crypto_blokechain.zip (crypto_blokechain.zip; handout)
  URL: https://deut-erium.github.io/assets/challenges/cyber-apocalypse-2023-blokechain/crypto_blokechain.zip
  Bytes: 1642
  SHA-256: b26190c3145eeadfb318487d410986baee6758d12c414ad297044626a9f68455
  Upstream provenance: https://raw.githubusercontent.com/cyberkarta/HTBCyberApocalypse2023/d3fc66c54303eb6f2a6cd831c786f054bb8214c6/crypto_blokechain.zip

Licenses (local copies):
No local license record is available for this entry.

SPOILERS - organizer files and solutions
Spoilers: organizer files and upstream source, archive, or solution links may reveal answers. Modified downloads are identified below.
Source: https://github.com/cyberkarta/HTBCyberApocalypse2023/blob/d3fc66c54303eb6f2a6cd831c786f054bb8214c6/crypto_blokechain.zip
Archive: https://github.com/cyberkarta/HTBCyberApocalypse2023/tree/d3fc66c54303eb6f2a6cd831c786f054bb8214c6