There is nothing like having a central bank for cryptocurrency, that’s not going to happen. Blockchain is open software and there is no one in control, everyone is in control of their money. If you’ve read Satoshi’s definition of cryptocurrency, he said that he wanted to create something that can help people send and receive money without the middleman, so cryptocurrency is like giving you complete freedom over your money and the risk is also on you. So there is no need for any bank.