The technical core of Defi (Decentralized Finance) is the Secure multi-party computation system based on the blockchain. The goal of Defi project is to rely on the world's leading technology and engineering capabilities, move from distributed Zhima Credit to ant financial services on the blockchain, serve 2 billion ordinary people in Southeast Asia who have not been covered by traditional financial services, and return to the original intention of the blockchain to serve the next billion.In the 2B application scenario, Defi can promote data sharing among financial institutions, reducing operational risks caused by bad debts and improving profits on the one hand; On the other hand, it can improve sales conversion rate and increase revenue. In the 2C application scenario, Defi's personal data wallet function enables individuals to return ownership of data to individuals, allowing them to enjoy the benefits of data being used. Two scenarios are interconnected, and blockchain based multi-party secure computing technology can solve the problem of mutual distrust among data owners. While ensuring data security and privacy, it enables institutions and individuals to jointly participate in multi-party secure computing....