Finance column author Xiao Lei said in an interview with "Daily Economic News" that the market value of this wave of virtual currency is close to 400 billion US dollars at the highest. What concept is this? Facebook's market capitalization is also $400 billion. In this case, it cannot be said that the virtual currency has no value. In economics, having prices is basically worthwhile. What is the value of it, how can it have a price? The value of virtual currency is based on the blockchain, but this is something very marginal that everyone can touch. How can the real value of the blockchain be mined? No one knows this. In this regard, China's central bank and Internet giants such as BAT are also exploring. Bitcoin, a star-rated application of the blockchain, proves that technology is safe and cannot be destroyed.