Research on API Data Transmission Integrity and Privacy Protection System Based on Blockchain Technology

The system uses decentralized blockchain technology to ensure the integrity of data in the transmission process by using its immutable characteristics. At the same time, combined with advanced encryption technology, the transmitted data is strictly protected to prevent privacy disclosure. This paper introduces the concept of hash paths to further improve the security of the system by building a multi-layer hash chain that effectively tracks and validates every change in data. In the system design, this paper proposes an efficient consensus algorithm to ensure that the nodes in the blockchain network can reach a consensus quickly, reduce the delay and ensure the high efficiency of data transmission. In addition, the detailed model simulation is also carried out in this paper, and many experiments verify that the system can significantly improve the security and integrity of data transmission while maintaining a high data processing efficiency. This study not only provides a new solution to the privacy protection problem in API data transmission, but also provides a useful reference for the expansion of blockchain technology in practical applications.