so with all those zcash clone recently, someone can enlighten me? zcoin, for example they said it's use a better technology than zcash, is this true or just a scam coin that want to ride the hype before the official zcash launch?
It's hard to tell which tech is better. Zcoin uses earlier more proven Zerocoin tech. Zcash uses cutting edge tech but has drawbacks as well.
Zcoin is called Zcoin cause of the use of Zerocoin paper.
Zcash is called Zcash cause of the use of Zerocash paper.
I wouldn't call it a scam coin just cause of the name.
Further reading:
http://blog.zcoin.tech/zcoin-and-zcash/I also posted on this here:
https://bitcointalk.org/index.php?topic=1663416.msg16708960#msg16708960