It doesn't make much sense to use a memory hard hash function as part of the Hashcash proof of work system, since 1) Proof of Work systems should make verifica

It doesn't make much sense to use a memory hard hash function as part of the Hashcash proof of work system, since 1) Proof of Work systems should make verification as cheap as possible. 2) Hashcash makes verification as expensive as proof attempt. Project pages for the above asymmetric Proof of Work systems, which do not suffer from this conflict, can be found at https://github.com/khovratovich/equihash https://github.com/khovratovich/equihash https://github.com/tromp/cuckoo https://github.com/tromp/cuckoo