A Systematic Review for Privacy-Preserving Challenges of Blockchain-Based IoT Networks

Blockchain-based distributed ledger technology is a data management technology that stores a time-ordered set of transactions to verify all transactions without third-party organizations acting as authorities. Thus, it supplies privacy, integrity, and confidentiality due to its central attributes by implementing different strategies such as encryption, anonymization, and private contracts. This technology can develop decentralized and data-intensive applications that run on many devices, maintaining users’ privacy. Given these advantages, several studies have been conducted on improving privacy issues through the use of blockchain technology. As IoT networks still face significant privacy obstacles due to IoT big data volume, velocity, variety, and value With their exponential growth, some researchers have suggested overcoming them with decentralized blockchain solutions. This research aims to systematically review the current approaches to blockchain applications for preserving privacy in IoT, in order to highlight challenges, difficulties, and future research paths.