whats differences of zcoin vs zclassic? Thanks
Zclassic is a almost an exact fork of Zcash (different project). It's the same tech as Zcash but they dumped the founder's reward I believe.
Zcash uses Zerocash protocol.
Zcoin uses Zerocoin protocol and isn't a fork of any coin (though there are forks of Zcoin like Zoin and zcoin classic).
There is no relation between the Zcoin and Zcash teams though the many of the guys working in Zcash now wrote the original paper on Zerocoin (the protocol that Zcoin uses).
Both use zero knowledge proofs but different underlying cryptography. Zcash seeks to bring down proof sizes and greater anonymity in exchange for using less tested cryptography, more computational requirements and an unauditable supply. Zcoin uses more established cryptography and is computationally less intensive than Zcash with a fully auditable supply but has larger proof sizes. Both has its pros and cons and despite differing views, we think that both techs are pretty awesome.
Once we implement MTP, it is also our view that it will be a superior PoW algorithm to Equihash. In fact MTP was created to address the shortcomings of Equihash.
For a full explanation you can check it on our blog post on why we think Zerocoin is the more prudent implementation:
http://zcoin.io/language/en/zcoin-and-zcash/
