On May 8th, in response to the BTC discussion on the use of reorganization and recovery of the stolen money in the network, Liu Chang, the founder of Zhimi University, used the official article of the forward currency and said that the cryptocurrency (cryptocurrency) is a social phenomenon. Non-rollback, non-bifurcation, non-issuance, power calculation, and even block size have become an ideology, even if it is only a discussion of public opinion attacks that will attract anger. It is reported that the official Weibo content of the currency security is: Bitcoin rollback will not occur. The Bitcoin ledger is the most credible book in the world that has not been tampered with. Bitcoin rollback is a technical solution from the community.