The Internet of Things (IoT) has infiltrated extensively into our lifestyles. Nevertheless, IoT privacy remains a significant obstacle, primarily because of the large size and distributed existence of IoT networks. Also, numerous safety, authentication, and maintenance problems of IoT systems have been overcome by the decentralized existence of blockchain. To obviate these privacy difficulties, the privacy challenges of IoT-based blockchain are examined systematically. Totally, 61 papers have been gained by electronic databases and based on different filters, 20 related articles were obtained and analyzed. The findings showed that the blockchain could dominate the IoT restrictions, such as data protection and privacy. It can also supply distributed storage, transparency, trust, and secure distributed IoT networks and supply a beneficial guarantee for the privacy and security of IoT users. Simultaneously, it has low scalability, high computing complexity, IoT-unsuitable latency, and high overhead bandwidth.

物联网（IoT）已广泛渗透到我们的生活方式中。尽管如此，物联网隐私仍然是一个重大障碍，这主要是由于物联网网络的规模大且分布广泛。此外，区块链的分散存在已克服了IoT系统的众多安全性，身份验证和维护问题。为了消除这些隐私困难，系统地研究了基于物联网的区块链的隐私挑战。通过电子数据库共获得61篇论文，并根据不同的过滤条件，获得20篇相关文章并进行了分析。研究结果表明，区块链可以主导物联网的限制，例如数据保护和隐私。它还可以提供分布式存储，透明性，信任，安全的分布式物联网网络，并为物联网用户的隐私和安全性提供了有益的保证。同时，它具有低可扩展性，高计算复杂性，物联网不合适的延迟以及高开销带宽。