International Journal of Engineering, Technology and Computer Science

The rapid digital transformation across communication ecosystems has intensified the need for secure, transparent, and tamper-resistant authentication mechanisms. Traditional centralized authentication systems often face vulnerabilities such as single points of failure, data manipulation, and unauthorized access. In response, blockchain technology has emerged as a decentralized and immutable solution capable of strengthening data integrity and trust within digital networks. This research paper explores blockchainbased authentication and data integrity frameworks, emphasizing their structural components, operational mechanisms, and potential applications across diverse domains. By analyzing consensus protocols, cryptographic hashing, distributed ledgers, and smart contract–driven validation processes, the study evaluates the comparative effectiveness of blockchain in contrast to conventional security models. It also highlights the suitability of blockchain for identity management, access control, supply chain validation, academic certificate verification, healthcare records, and secure governmental data systems. Furthermore, the paper investigates key challenges involving scalability limitations, interoperability gaps, resource consumption, regulatory uncertainties, and user-level awareness. The study concludes that while blockchain presents a transformative foundation for secure authentication and data integrity, its widespread adoption requires hybrid architectures, policy-level standardization, and enhanced user literacy. This work contributes to ongoing academic discussions by presenting a theoretical, multidisciplinary perspective on the future of blockchain-enabled security infrastructures.