Zcash, monero, dash, mimblewimble and quisquis have big challenges. It is not trivial to solve the encrypted coins problem because: - it is very hard to audit

Zcash, monero, dash, mimblewimble and quisquis have big challenges. It is not trivial to solve the encrypted coins problem because: - it is very hard to audit the chain for bugs. If someone finds a bug to create coins through thin air you probably won't notice it. - regulations by states is made hard. If you are required to pay taxes, and you live in a society, then these things do matter. If you want cryptocurrencies to work, we need cryptocoins that are not encrypting transactions.