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In the era of the Internet of Things (IoT), massive computing devicessurrounding us operate and interact with each other to provide severalsignificant services in industries, medical as well as in daily life activitiesat home, office, education sectors, and so on. The participating devices in anIoT network usually have resource constraints and the devices are prone todifferent cyber attacks, leading to the loopholes in the security andauthentication. As a revolutionized and innovated technology, blockchain, thatis applied in cryptocurrency, market prediction, etc., uses a distributedledger that records transactions securely and efficiently. To utilize the greatpotential of blockchain, both industries and academia have paid a significantattention to integrate it with the IoT, as reported by several existingliterature. On the other hand, Artificial Intelligence (AI) is able to embedintelligence in a system, and thus the AI can be integrated with IoT devices inorder to automatically cope with different environments according to thedemands. Furthermore, both blockchain and AI can be integrated with the IoT todesign an automated secure and robust IoT model, as mentioned by numerousexisting works. In this survey, we present a discussion on the IoT, blockchain,and AI, along with the descriptions of several research works that applyblockchain and AI in the IoT. In this direction, we point out strengths andlimitations of the related existing researches. We also discuss different openchallenges to exploit the full capacities of blockchain and AI in designing anIoT-based model. Therefore, the highlighted challenging issues can open thedoor for the development of future IoT models which will be intelligent andsecure based on the integration of blockchain and AI with the IoT.

How Can Applications of Blockchain and Artificial Intelligence Improve Performance of Internet of Things? -- A Survey