Description: Blockchain Technology and Secure Distributed Systems provides a comprehensive exploration of blockchain principles and their role in building secure, decentralized, and trustworthy digital systems. The book covers distributed ledgers, consensus mechanisms, cryptographic techniques, smart contracts, decentralized applications, blockchain architecture, and network security. It examines applications across finance, healthcare, supply chains, digital identity, education, and other emerging domains. Special attention is given to security challenges, privacy, data integrity, scalability, and decentralized trust. By combining theoretical foundations with practical perspectives, the book helps readers understand the design, implementation, and applications of blockchain-based distributed systems. It serves as a useful resource for students, researchers, developers, educators, and technology professionals.