According to the China Economic Net, on November 11, Digital Technology (300079, shares) issued a letter of concern issued by the Shenzhen Stock Exchange. The Shenzhen Stock Exchange requires the company to explain the specific subject of the investment blockchain project, and explain the establishment time, number of personnel, R&D application phase and relevant core technologies of the R&D team. Is there a situation in which the use of interactive hot spots and speculation of stock prices? Insiders pointed out that in addition to a small number of institutions investing a lot of financial resources and team development, most of the listed companies' blockchain business is still in the state of planning and concept, and there is still a long way to go from scale application. . At this stage, a large number of “defective” companies “chickens and dogs are rising”. Without the real business support, the bubble may soon burst. For investors, it is necessary to polish their eyes to distinguish.