Blockchain Models Applications: A Comparative Study on Security

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This paper presents a comprehensive comparative study of blockchain models—public, private, and consortium—focusing on their security features and implications for real-world applications. The analysis reveals that while public blockchains offer strong decentralization and transparency, they face challenges related to scalability and privacy. In contrast, private blockchains prioritize control and efficiency but may introduce vulnerabilities due to centralized governance. Consortium blockchains provide a balanced approach, leveraging the strengths of both public and private models while fostering collaboration among stakeholders. Through detailed examination of security challenges such as double-spending and smart contract vulnerabilities, along with real-world case studies in sectors like supply chain management and healthcare, this study highlights critical trade-offs between security, scalability, privacy, and resilience. The findings offer valuable insights for stakeholders considering blockchain adoption and underscore the need for ongoing research to explore innovative solutions that enhance security without sacrificing decentralization or scalability.