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The Internet of Things (IoT) is increasingly influencing and transformingvarious aspects of our daily lives. Contrary to popular belief, it raisessecurity and privacy issues as it is used to collect data from consumers orautomated systems. Numerous articles are published that discuss issues likecentralised control systems and potential alternatives like integration withblockchain. Although a few recent surveys focused on the challenges andsolutions facing the IoT ecosystem, most of them did not concentrate on thethreats, difficulties, or blockchain-based solutions. Additionally, none ofthem focused on blockchain and IoT integration challenges and attacks. In thecontext of the IoT ecosystem, overall security measures are very important tounderstand the overall challenges. This article summarises difficulties thathave been outlined in numerous recent articles and articulates various attacksand security challenges in a variety of approaches, including blockchain-basedsolutions and so on. More clearly, this contribution consolidates threats,access control issues, and remedies in brief. In addition, this research haslisted some attacks on public blockchain protocols with some real-life examplesthat can guide researchers in taking preventive measures for IoT use cases.Finally, a future research direction concludes the research gaps by analysingcontemporary research contributions.

Challenges in Blockchain as a Solution for IoT Ecosystem Threats and Access Control: A Survey