Cryptocurrency was invented so internet payments could be be as anonymous and private as physical cash. Most exchanges are the weak-point, where virtual wallets become linked to real-world identities, requiring a scan of one's I.D. just to trade Dogecoin for Zcash.
bitni.com stays true to the founding ideals of crypto-freedom - Trade DOGE for ZEC anonymously without identification. No tracing or spying on your activity.