Blockcity is the entrance for users to experience the blockchain world. It is a large-scale mobile app, based on GXChain. GXChain is a fundamental blockchain for the global data economy, designed to build a trusted data internet of value. One of our targets is to make Blockcity the largest blockchain dApp platform worldwide and help dApps to easily commercialize and benefit everyone. In the future, Blockcity will work on the trusted data economy and help users take control of and earn from their data.