The quick development of quantum computing technologies threatens the traditional cryptographic methods used in blockchain networks so they need quantum-resistant encryption standards for protection. The study shows the procedure to implement Quantum Digital Signatures (QDS), Post-Quantum Cryptography (PQC), Quantum Key Distribution (QKD), and Quantum-Enhanced Consensus Mechanisms (QECMs) in order to protect blockchain networks from quantum attacks. This chapter investigates quantum security approaches including their advantages and technical hurdles along with description of performance and future quantum artificial intelligence standards and standardized security frameworks. The deployment of quantum advancements in blockchain brings about an improved functional capacity and strengthened protection against threats so blockchain becomes a sustainable decentralized platform in the post-quantum realm.