Abstract
As a kind of point-to-point distributed public ledger technology, blockchain has been widely concerned in recent years. The privacy protection of blockchain technology has always been the core issue of people's attention. In this paper, some existing solutions to the current problems of user identity and transaction privacy protection are surveyed, including coin mixing mechanism, zero knowledge proof, ring signature and other technologies. Secondly, five typical applications of privacy protection technology based on blockchain are proposed and analyzed, which are mainly divided into technology applications based on coin mixing protocol, encryption protocol, secure channel protocol and so on. Finally, in view of the shortages of the existing blockchain privacy protection technology, we explore future research challenges that need to be studied in order to preserve privacy in blockchain system, and looks forward to the future development direction.
Highlights
Blockchain is the underlying technology behind digital cryptocurrencies such as bitcoin, ethereum and hyperledger
Blockchain technology has been extended to digital finance [2], Internet of things (IoT) [3], [4], edge computing [5], Artificial Intelligence (AI) [6], Supply Chain Management (SCM) [7] and many other fields
We need to continue to study and improve the computing performance and storage performance of the schemes based on cryptography, and design encryption schemes with higher efficiency, better performance and stronger privacy
Summary
Blockchain is the underlying technology behind digital cryptocurrencies such as bitcoin, ethereum and hyperledger. It originated by Satoshi Nakamoto (a pseudonym) on the bitcoin forum in 2008 – Bitcoin: A Peer-to-Peer Electronic Cash System [1], which has triggered a new round of technological revolution and industrial revolution, is one of the most cutting-edge and hottest technologies. Blockchain technology has been extended to digital finance [2], Internet of things (IoT) [3], [4], edge computing [5], Artificial Intelligence (AI) [6], Supply Chain Management (SCM) [7] and many other fields. For the purpose of providing some reference and help for current and future research, it is necessary to systematically analyze and summarize the privacy protection of blockchain
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