Lack of trust, lack of standards, and low efficiency are the three biggest problems in China’s trade financing at present. With the development and application of new generation technologies such as big data, cloud computing, artificial intelligence, and blockchain technology, China is in the stage of financial technology 3.0 under the deep integration of finance and technology. In the field of financial technology, the most concerned is the application of blockchain technology in trade finance business. With the successive construction of various blockchain platforms and the acceleration of the internationalization process, the international trade credit risk behind it is also increasing. Among many financial services, trade finance is the most closely integrated field with blockchain technology. In this context, preventing the risks in the business process of international trade enterprises, so as to reduce the cost of financial transactions, improve the effectiveness of financial services, and better serve the real economy is not only the internal development needs of enterprises, but also the national financial strategy needs. In view of the above problems, this paper analyzes the risk factors faced by multinational trading enterprises in the transaction process through the transaction data of some multinational enterprises on mobile phones, and constructs a credit evaluation system of international trading enterprises based on blockchain, in order to enhance the trade risk resistance ability of international trading companies.

As an object of rapid development of Internet technology in recent years, network security has attracted more and more attention from people from all walks of life and has gradually become a topic in international trade activities. The application of blockchain is also extremely extensive, involving many aspects, such as the development of the metaverse game engine and bank financing. With the launch of the Belt and Road strategy, trade exchanges have become more and more frequent, and at the same time, cross-border e-commerce, a new type of industry that applies Internet information technology, has emerged. The application of blockchain technology to international trade big data processing can not only improve the utilization rate of massive transaction information resources shared by enterprises, governments, financial institutions, and other institutions, but also reduce enterprise costs. The use of blockchain improves the efficiency of data storage, reduces the degree of encryption, and reduces the amount of database access and server resource occupation. This paper mainly studied the application of blockchain in international trade big data system, introduced its secure and trusted distributed network architecture, and analyzed its performance. The experimental results showed that the performance of the decentralized manager was better than that of the centralized manager when processing a large amount of data. The peak throughput of the decentralized manager was about 450 pcs/sec and the peak throughput of the centralized manager was about 150 pcs/sec. And the performance of the storage system in the local area network was better than that in the public network.

COVID-19 has made the world realize that the world is a whole, and international trade is the main way to connect countries. With the increase of international trade, the trade data has also become gradually huge. However, the current international trade data is still transmitted using the traditional Internet, which not only is inefficient, but also has poor security. Therefore, this paper aimed to use blockchain technology to explore the big data sharing model and key mechanism of international trade. This paper mainly introduced the design and implementation of a blockchain-based IoT data security sharing system. Firstly, the functional architecture of the prototype system was comprehensively introduced. According to the division of different functional modules, the data interaction design of different modules and the design of related smart contracts were expounded. According to the characteristics of international trade big data, the encryption and decryption algorithms are designed for the transmission of international trade big data. Finally, the prototype system was introduced from data acquisition, experimental environment deployment, system-related functional verification, and performance testing. The experimental test results showed that the encryption and decryption of transaction data by the data security sharing prototype system were more than 2 times faster than those of the traditional algorithm, and the transmission efficiency of the system at different nodes fluctuated within 10%, which showed that the system could perform security interactive sharing of data.