The proliferation of Internet of Things (IoT) devices has raised significant concerns regarding secure digital communication. Existing communication protocols are vulnerable to cyber-attacks, compromising data integrity and confidentiality. This study addresses the research gap by designing and implementing a secure digital communication protocol for IoT devices using blockchain technology.Theincreasing adoption of IoT devices has led to a surge in cyber-attacks, highlighting the need for robust security measures. Traditional communication protocols rely on centralized authorities, making them susceptible to single-point failures. The problem of the research paper was to identify how can a secure digital communication protocol be designed and implemented for IoT devices to ensure data confidentiality, integrity, and authenticity? The objective of the study is to identify the area of developing a blockchain-based digital communication protocol for IoT devices, ensuring secure data transmission and reception. Collection of data has been made through a comprehensive literature review of existing IoT communication protocols and blockchain technology. Experimental data has been collected from simulations using IoT devices and blockchain platforms. Research methodology of the study has witnessed a mixed-methods approach combining qualitative and quantitative research methods. The study has aimed to develop a novel blockchain-based digital communication protocol for IoT devices, enhancing security and trust in IoT ecosystems. This protocol will mitigate cyber-attack risks and ensure data confidentiality, integrity, and authenticity. The research has significant implications for IoT device manufacturers, network providers, and users, promoting a secure and reliable IoT environment.