Master Blockchain, Cryptography, and Smart Contracts. Unlock the true potential of blockchain technology with this essential guide, crafted for students and professionals looking to stay ahead in the fast-evolving digital landscape. Beginning with the foundations of Blockchain, the book moves on to explain the basics of decentralized, distributed ledgers that secure digital assets. You will then explore the role of Cryptographic Hash Functions (CHF) in safeguarding blockchain transactions through fixed-length hash values. Next, you will discover applications of Blockchain in Cryptocurrency and how digital assets like Bitcoin operate without central authorities. The book also covers Distributed Consensus in Open and Closed Environments, showing how blockchain ensures uniform agreement among nodes without a central server. You will then explore how blockchain is transforming industries by enabling secure, peer-to-peer transactions. The book introduces Hyperledger and Smart Contracts, highlighting how these tools automate and secure agreements without intermediaries. Finally, you will learn about facilitating communication between different blockchain networks through Blockchain Interoperability, and Legal and Environmental Aspects, examining the legal and environmental challenges blockchain faces. This book is not just a resource — it's your roadmap to mastering blockchain technology and revolutionizing your business. This book is tailored for undergraduates in Computer Science, IT, and MCA programs, as well as professionals and individuals in related fields. It assumes a foundational understanding of blockchain technology and cryptography, making it ideal for those seeking to deepen their knowledge in these areas.