I think that cryptocurrency and fiat currency can be used together. The feature of cryptocurrency is that fiat currency does not have, and the feature of fiat currency is that cryptocurrency does not. If there is no fiat currency, how do we buy cryptocurrency, and now various countries are launching digital fiat currency , This is actually a threat to cryptocurrency, because the government cannot control cryptocurrency. It will prohibit the use of cryptocurrency for everyone to use legal digital currency. It will be a blow to cryptocurrency at that time, but we Everyone likes to use cryptocurrency because it is relatively free, not regulated by the government, and there is no third party. Your own information will not be easily leaked, and now transaction payments are more convenient and fast