The "2019 Digital Finance Annual Summit" was held in Tsinghua University in Beijing on the 20th. Xu Zheng, assistant dean of the Institute of Interdisciplinary Information of Tsinghua University, said in a speech that the centralized database can also be immutable, leave traces throughout the process, and be traceable and collectively maintained. Open and transparent functions. Decentralization is not a feature of blockchain technology, but it can also achieve these functions under the specific needs of no centralized trust. This is the focus of grasping the innovation of blockchain technology. Blockchain technology consumes a large amount of resources is not part of the consensus protocol. On the one hand, it consumes resources to prove identity and prevent witch attacks; on the other hand, it maintains many copies of data.