We live in a world where everything is connected via the Internet of Things (IoT). Despite this, IoT privacy remains a serious challenge, particularly due to IoT networks' vast scale and dispersed nature. Using protected solutions, such as incorporating blockchain technology into privacy-based services, is one approach to privacy-related concerns. Various Internet of Things security and authentication issues have been resolved by the decentralized nature of blockchain technology. This paper examines how blockchain technology mitigates the security and privacy concerns of IoT networks. In addition, we investigate the structure and uses of blockchain technology for recommender system privacy and trust management solutions. The limitations of adopting the blockchain technology also discussed. From the analysis of literature works, the blockchain technology could be able to circumvent IoT limitations such as data security and privacy. In addition, it may offer IoT customers distributed storage, transparency, trust, safe distributed IoT networks, and privacy and security assurance.

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