Proof-of-Work (PoW)

The challenger will receive a prefix and number n representing difficulty. He has to compute an answer such that sha256(prefix + answer) has n leading zero bits.

This PoW is used in Balsn CTF 2019.

Pow solver

We support various languages to help you solve the obnoxious PoW.

• Python 2
• Python 3
• NodeJs
• Browser-based
• Ruby
• Go (contributed by Lee Xun)
• Rust
• C/C++
• Java

Modules

• powser.py: A IP-based PoW server module implemented in Python 3.8. Suitable for web challenges.
• nc_powser.py: A simple PoW server module implemented in Python 3.8. Suitable for nc-based challenges.