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The Internet of Things (IoT) is a rapidly emerging technology that enables more efficient human-to-human and environmental interactions. It also serves as a catalyst for advancements in healthcare, smart cities, logistics, and a variety of other industries. IoT networks grow in size and complexity as more sensors, smart metres, RFIDs, and actuators are added to suit their design requirements. This creates scalability, security, authenticity, and dependability concerns. Thus, addressing predicted issues adequately is crucial to advancing IoT deployment. This is where blockchain technology fits in. The introduction of blockchain technology holds the promise of resolving various IoT challenges. Blockchain's transparency, stability, traceability, and security set it apart from other technologies when it comes to improving IoT networks. This article highlights the key challenges facing IoT systems and how blockchains can assist in resolving them. Additionally, it summarizes the current study in the context of previous research on the integration of IoT and blockchain.