On May 8th, by investigating 80 digital currency centralization exchanges created between 2010 and 2015, it was found that nearly half of the exchanges have been closed, and some closed exchanges have directly erased the customer’s balance. . The centralized exchange has a failure rate of 48% and an average life of 451 days. The solid line in the image below shows the overall survival probability of the exchange and the 95% confidence interval (black dotted line). It can be seen that only about 70% of the exchanges have a life cycle of more than one year.