Fucking awesome. Truly trustless decentralised mixing - this could be Block's killer app.

Any coins of any currency you want to mix? Bitcoin, Litecoin, Syscoin, Ether etc. Just use the zcash mixer. And since Block is used it will boost the price of Block up the more the service is in demand. Positive feedback loop baby.

Note this works because of the atomic swaps used as the foundation of the Xbridge.