With the rapid development of the Internet of things (IoT), it has brought great convenience for people's life. However, the security and privacy of IoT still face a major challenge. To remedy these issues, in this study, the authors first introduce the three-tier architecture of IoT and analyse the corresponding security problems of each layer, then they discussed the compatibility between IoT and blockchain. Secondly, they propose a new, distributed blockchain-based security architecture of

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... T, which rely on gateway nodes of perception layer to secure data storage and sharing, and use middleware servers to analyse and process data. Finally, they adopt game theory to model and analyse their designed scheme. The results demonstrate that their scheme is a safe and deployable framework for IoT data security and privacy.