As the Internet of Things (IoT) continues to permeate various aspects of our daily lives, ensuring the security of interconnected devices becomes paramount. Blockchain technology, known for its decentralized and tamper-resistant nature, has emerged as a promising solution for fortifying the security of IoT networks. This comprehensive exploration delves into the ongoing research efforts and the potential of blockchain in enhancing the security framework of IoT, backed by insights and findings from reputable sources.