The combination of blockchain technology with multi-layered architectures has surfaced as a promising strategy to improve security in the Internet of Things (IoT), utilizing a trustless environment to achieve this enhancement. This paper investigates the capability of blockchain to tackle security challenges in the Internet of Things (IoT) is significant, focusing on its impact on energy consumption, latency, and underlay network throughput compared to traditional security mechanisms. A game-theoretic model is developed to analyze the interactions between attackers and defenders, illustrating how the introduction of blockchain alters the strategic dynamics of security within IoT networks. Additionally, a comprehensive model of information security is proposed to evaluate the effectiveness of various consensus algorithms and their impact on the overall robustness of the system. The findings indicate that while blockchain introduces some overhead in terms of energy and time, it significantly decreases the likelihood of a successful attack and improves system resilience. The research highlights the potential of blockchain to secure IoT networks and emphasizes ongoing improvements to the technology, particularly in the context of optimizing consensus algorithms and minimizing system inefficiencies.