Basic blockchain service platform of Xicheng District: Based on our basic blockchain service platform, we built the basic blockchain service platform of Xicheng District. On the basis of its underlying blockchain, this platform has basic common functions of blockchains, including node management, consensus algorithms, smart contracts, account management, plugin management and privacy protection. It provides upper layers with data application, access and aggregation services of the access layer. It empowers applications of upper layers such as smart contract management, identity authentication management, user management for consortiums, operation and maintenance management. Regulated by access, inter-blockchain and interaction standards, this platform provides blockchain application services for various users of Xicheng District, assists governments in making innovations of their management methods and constructs a new social governance system.