We are planning to build an exchange and banking into the app this year. Today when you withdrawal from an exchange you give them a bitcoin address and they tie it your user and send you the funds. I've figured out a way so you can provably withdrawal from the exchange without us knowing your address, we would just know your address is one of these 100 (or whatever the size of batch was).

withdrawals from our future exchange to your non-custodial wallet :)