The application of blockchain technology to credible transactions in the modern service industry can promote the construction of a new generation of information technology infrastructure and accelerate the formation of a modern service industry technology development system. This report is oriented to modern service industry scenarios such as Internet finance and e-commerce transactions. It focuses on the trusted transaction smart contract service model，researches the underlying key technologies of the trusted blockchain and builds the trusted transaction underlying chain，and develops services based on the underlying chain. Trust trading blockchain platform，the design includes application services and basic support platform functional architecture，as well as the deployment architecture of blockchain network components and transaction participants；at the same time，select financial assets ABS，digital warehouse receipts，and typical scenarios of supply chain finance，based on The experimental platform verifies the application of the full-cycle management and supply chain of the modern service credible transaction process，and provides solid theoretical support and application demonstrations for the credible transaction of the modern service industry.