One problem with the centralization of existing e-commerce platforms is how to store data. E-commerce platforms have a large amount of data, and consumers' personal data and payment data are stored on central servers vulnerable to cybercriminals after being handed over to e-commerce companies, which poses a high risk of data leakage. However, the e-commerce platform based on block chain is decentralized. There is no need to store the personal data and payment data of tens of millions of users. The block chain platform is actually decentralized, and consumers can store and control their own data in this decentralized system, which can more effectively avoid the potential data leakage risk.