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The exponential growth of Internet of Things (IoT) devices with limited computing resources and poor security configurations make them vulnerable to different cyber-attacks. Mirai Botnet malware exploits vulnerabilities of IoT devices resulting in massive Distributed Denial of Service (DDoS) attacks. Various techniques have been proposed to mitigate Mirai botnet attacks, but most of them are centralized or just provide precautionary steps to secure the IoT devices. This paper addresses IoT security against Mirai Botnet attacks using a novel blockchain based architecture. In our proposed approach, the network is divided into different Autonomous Systems (AS), through which host connectivity is established. Blockchains are used to store and share a list of Internet Protocol (IP) addresses of different hosts connected to an AS, indicating which of these have been identified as malicious. Every AS monitors the …