Blockchain expert Xu Mingxing said in an interview that "decentralization," "scalability," and "security" are the difficulties that have hampered the large-scale application of blockchains. Blockchain 1.0 era cryptocurrency is only used as a means of payment and digital gold is purchased. Low liquidity is the advantage of its appreciation. However, with the advent of the 2.0 era, the emergence of smart contracts has led to the landing of many functional blockchain projects. Low liquidity does not meet people's needs, so low expansion has become an obstacle to the development of blockchain technology.