Traditionally, the security of IT infrastructures has depended on centralized control mechanisms and trusted intermediaries, which have increasingly become vulnerable to cyber-attacks, data breaches, and system failures. In recent years, blockchain technology has emerged as a promising security paradigm by introducing decentralization, immutability, and cryptographic verification into digital systems. However, despite these advantages, blockchain-based security solutions are not universally optimal and face inherent limitations related to scalability, performance overhead, and regulatory compliance. As network size and transaction volume increase, these constraints can impact system efficiency and practical deployment. This study presents a comprehensive review of blockchain applications beyond cryptocurrencies, examining their role in securing modern IT infrastructures. The analysis identifies that while blockchain significantly enhances data integrity, transparency, and system resilience, its effectiveness depends on appropriate architectural design and integration with emerging technologies such as artificial intelligence and the Internet of Things.

Blockchain technology offers a practical and effective approach to addressing many of the security challenges faced by modern IT infrastructures. Traditional centralized systems, while efficient, are increasingly vulnerable to data breaches, insider threats, and single points of failure. The analysis presented in this study demonstrates that blockchain’s decentralized architecture, combined with cryptographic verification and immutable record keeping, significantly enhances data integrity, transparency, and system resilience in distributed environments. The findings highlight a clear distinction between conventional security models and blockchain-based frameworks. In large-scale and interconnected systems such as cloud platforms, enterprise networks, and IoT ecosystems, blockchain reduces reliance on trusted intermediaries and improves trust management among multiple stakeholders. However, the study also reveals that blockchain adoption is not without limitations. Performance overhead, scalability constraints, and regulatory considerations remain critical factors that influence real-world deployment and effectiveness. Notably, the effectiveness of blockchain-based security solutions is highly dependent on architectural design and application context. While blockchain strengthens security in environments that prioritize transparency and tamper resistance, it may introduce inefficiencies in scenarios requiring high transaction throughput or real-time processing. Therefore, blockchain should be viewed as a complementary security layer rather than a universal replacement for existing mechanisms. Ultimately, this review confirms that blockchain extends far beyond its origins in cryptocurrency systems and represents a valuable tool for securing digital infrastructures in the modern era. When integrated thoughtfully with emerging technologies such as artificial intelligence and the Internet of Things, blockchain has the potential to form a resilient foundation for next-generation IT security frameworks.

[1] S. Nakamoto, “Bitcoin: A Peer-to-Peer Electronic Cash System,” 2008. [2] F. Saleh, “Blockchain without waste: Proof-of-stake,” Review of Financial Studies, vol. 34, no. 3, pp. 1156–1190, 2020. [3] S. Rose, O. Borchert, S. Mitchell, and S. Connelly, Zero Trust Architecture, NIST Special Publication 800-207, 2020. [4] Y. Zhang, R. Xue, and L. Liu, “Security and privacy on blockchain,” ACM Computing Surveys, vol. 52, no. 3, 2021. [5] P. K. Sharma, N. Kumar, and J. H. Park, “Blockchain-based secure frameworks for Internet of Things,” IEEE Communications Surveys & Tutorials, vol. 24, no. 1, pp. 110–139, 2022.

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