Blockchain technology has revolutionized digital transactions by providing decentralized, transparent, and immutable solutions for various sectors, including supply chain management, health care, and banking. This chapter explores the evolution of blockchain technology, beginning with Bitcoin (Blockchain 1.0), progressing to smart contracts (Blockchain 2.0), and ultimately addressing advancements in interoperability. It conducts a comprehensive analysis of blockchain's architecture, highlighting its layered structure, consensus mechanisms, and peer-to-peer network configuration. A notable focus is placed on the security risks posed by quantum computing, which jeopardizes traditional cryptographic techniques. The adoption of quantum-resistant cryptographic strategies, such as post-quantum cryptography (PQC), is crucial for ensuring the long-term viability of blockchain. This study investigates emerging trends and solutions, providing insights into how blockchain can evolve to meet the increasing requirements for security and efficiency.