According to the "Guidelines for National Data infrastructure building" issued by the National Development and Reform Commission, the Data Bureau and MIIT, the document clearly proposes to use blockchain technology, encryption technology and smart contracts to build a trusted data circulation system. The guidelines encourage industries and localities to explore blockchain networks and privacy-preserving computation platforms to enhance Trust and Safety in the process of data circulation, promote the construction of a national integrated distributed data directory and digital identity system, and strengthen the traceability and trustworthiness of data asset certificates. The planning goal is to achieve a large-scale data trusted circulation pattern covering large and medium-sized cities in the next few years.