关键词: 区块链, 数据流通, 可信代理, 智能合约

Abstract: With the promotion and application of big data technology in the open network environment, more and more institutional cooperation alliances have emerged. The sharing and circulation of data has become an important resource sharing method in the alliance. Especially in the joint-work scenarios such as banks and medical care. Only by sharing the data held by the various institutions, alliances can form comprehensive and clear business views and effectively improve the efficiency of their service and production. However, in the process of sharing data between organizations, how to control and trace the flow of data circulation between the stakeholders with different interests has become a must-be-resolved problem to support efficient and credible data circulation. Therefore, this paper proposes a trusted data circulation system based on the supervision of blockchain, which guarantees that the circulation information of data get traced and cannot be tampered with, thereby promoting the establishment of a secure and trustworthy ecosystem of data sharing and circulation. On this basis, in response to the complex situation of low transmission efficiency and network instability in a large-scale network environment, a trusted agent is introduced into the system as the data service interface, and then the security and performance are promoted. Finally, a prototype system based on Hyperledger Fabric is implemented. The experimental results verify that the system has good scalability in terms of data transmission and user request responses.

Key words: blockchain, data circulation, trusted agent, smart contract