From a technical point of view, it's okay to explicitly ban bitcoin transactions in a country. Bitcoin transactions do not depend on a centralized state, but on all the nodes of the Internet. The state can be regarded as the central authority and can stop its own transactions, but cannot stop other nodes from continuing to operate. From the perspective of interests: according to the attack of 51% computing power, it can hinder the correctness of the receiving data of other nodes. However, the cost of use is too large. I have asked the people in the mine, and based on the current block size, it would cost billions or even billions of dollars to tamper with the data. The cost and purpose are not proportional. And digital currency cannot be banned.