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I don't know anything about ZCASH. I have been following Nxt and the SuperNet for a long time. The SuperNet split from Nxt and started using BitcoinDark and then became Komodo. The main BitcoinDark dev is with the Komodo platform now.

Is ZCASH using BitcoinDark tech?

ZCASH uses Zsnark technology, I dont know how that originated.