Hashcash should use stronger hash #30
Description
Describe the bug
FNV is not suitable for Hashcash.
Ruffles/Ruffles/Hashing/HashCash.cs
Line 23 in 3f0c582
Any math undergrad can break this in his spare time.
You need a stronger cryptographic algorithm for hashcash. The state of the art appears to be sha256, or at least sha1:
https://en.bitcoin.it/wiki/Hashcash#Hash_function_choices