According to China Economic Net News, Ouyang Rihui, deputy dean of the China Internet Economics Research Institute of Central University of Finance and Economics, recently said at the Bozhi Macro Forum that important issues in the application of digital currencies deserve attention. I think digital currency includes two types, legal digital currency and commodity digital currency. The first important question is for commodity digital currencies, where is its use boundary? For example, in the early days of virtual currencies such as Q coins, Facebook's digital currency platforms and influence were relatively large this time, but their use boundaries are still uncertain. There are also border issues in cross-border use. Another question is whether digital currency can be directly exchanged with fiat currency? Facebook's digital currency is also involved in this issue.