The 2017 blockchain has aroused great public interest. We realize that in addition to the popularity of digital currencies, blockchain-based applications can reshape many other markets. But like other night-hot technologies, the application of blockchain in real life, because of the fundamental characteristics of the blockchain, exposes some problems, many of which should become the main focus in 2018. One of them is scalability, and of course the existence of these problems also shows that the market for blockchain has made significant progress. Many big people think that the blockchain can prop up the next stage of the Internet and create a "decentralized" Internet.