According to CoinDesk, since the beginning of this year, many people have been thinking about a question: If you can't get rich through cryptocurrencies, which existing crypto products will still have a large number of users? Some people believe that the cryptocurrency industry can provide ordinary users with three killer applications: self-custody, peer-to-peer connectivity, and new business models. Self-custody allows users to own and control their own assets, peer-to-peer connections allow users to log in, register, identify or pay more conveniently, and new business models can provide users with more benefits. However, to realize these killer applications, speculation in the cryptocurrency industry first needs to be eliminated.