摘要：

Abstract:

【Purpose/significance】With the rapid development of big data and social networks, users' data in social networks are fac⁃

ing great risks of privacy disclosure. It is urgent to establish a complete and effective method to protect privacy data in social net⁃

works.【Method/process】Based on the problem of information leakage in social networks, classifies user privacy data, and constructs

different privacy data protection schemes through blockchain time stamp recording data storage, Hash function anonymous operation

of data, asymmetric encryption and digital signature of sending information. At last, uses python to code the simulation of blockchain

privacy data protection, and completes the simulation experiments of anonymity protection of personal privacy data and encryption pro⁃

tection of shared privacy data.【Result/conclusion】The privacy data protection method based on blockchain can effectively solve the

problem of privacy leakage in social network, and provide reference for the research of information security and social network securi⁃

ty.【Innovation/limitation】This paper designs a new data protection scheme based on blockchain for different types of privacy leakage,

which provides a new solution for the current social network privacy leakage problem. However, the existing methods will consume

more computing power in the process of information interaction. Subsequent research will optimize the computing power of blockchain

and try to build a better blockchain based privacy data protection system for social network.