GXChain is a big-data public blockchain that supports application development and smart contract. Based on Graphene technology and DPoS consensus mechanism, GXChain has many powerful functions, including G-ID, GVM, blockchain as a service(BaaS), and Blockcity Pay. On top of GXChain, two killer applications were launched: decentralized data exchange (To Business), that supports P2P data trading and sharing, currently serving more than 100 renowned companies, Blockcity (To Customers), a personal data consolidation Dapp with millions real-name verified users, providing abundant data resources for partners and applications on GXChain. GXChain ensures a secure, credible, high-throughput data transaction ecosystem via blockchain. The project was led by China blockchain developers, with the main net launched on June 2017.