According to the China Business News, Yang Fan, a central bank blockchain financial expert, said in an interview that the era of the big game between fiat digital currencies and illegal currency digital currencies has arrived. First of all, the game of monetary policy. Civil digital currencies further weaken the status of fiat currencies and weaken the role of monetary policy regulation. In fact, it is very detrimental to the stability of economic development. At the same time, fiat currency and illegal currency digital currency are both virtual currencies, and there are different algorithms and games. Digital currencies are issued by computer algorithms, so the issuance of private currencies such as Bitcoin is not determined by the central bank, but ultimately by social consensus.