Biometric authentication system has been a unique authorization technology which helped us secure data and systems for long period of time. However, with the world transforming digitally and new cutting-edge technologies introduced it has become more prone to cyber attacking, breaches, unauthorized access, and being hacked from any part of the world. This not only leads to access to sensitive data/information but also can possess a national security concern for countries [1] [2]. To address this challenge, introduction and implementation of Blockchain technology is necessary. Blockchain technology’s decentralized, transparent and immutable approach can help secure data and manage biometric authentication system. This paper explores the convergence of biometric authentication with blockchain examining how blockchain can enhance data security, ensure user privacy, and provide a tamper-resistant environment for identity verification. This paper also discusses key aspects of blockchain technology, potential uses for different industries, challenges, scalability, functionality, pros & cons, and regulatory compliance. By highlighting the synergy between these technologies, this research aims to shed light on how blockchain can revolutionize biometric authentication, paving the way for more secure and privacy-centric digital ecosystems.