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The Internet of Things (IoT) is experiencing an exponential growth in a wide variety of use-cases in multiple application domains, such as healthcare, agriculture, smart cities, smart homes, supply chain, and so on. To harness its full potential, it must be based upon a resilient network architecture with strong support for security, privacy, and trust. Most of these issues still remain to be addressed carefully for the IoT systems. Blockchain technology has recently emerged as a breakthrough technology with the potential to deliver some valuable properties such as resiliency, support for integrity, anonymity, decentralization, and autonomous control. A number of blockchain platforms are proposed that may be suitable for different use-cases including IoT applications. In such, the possibility to integrate the IoT and blockchain technology is seen as a potential solution to address some crucial issues. However, to achieve this …