My opinion has always been very firm, that is, Bitcoin has no value. If Bitcoin must be valuable, it is just illegal value. Some people say that Bitcoin is non-issuable, and the total amount is limited to 21 million. At the same time, it has the characteristics of decentralization and can effectively resist inflation. Therefore, Bitcoin is the lifeline of the human economy in the future and will replace the official currency of all countries. I don't agree with this point.