Learn how to transition cryptocurrency networks to quantum-resistant security through a practical demonstration of implementing NIST finalist post-quantum algorithms in an existing blockchain system. Explore the critical role of Public Key Infrastructure (PKI) in ensuring transaction authenticity and integrity through digital signatures, and understand how quantum computing poses an existential threat to current RSA and ECC algorithms through Shor's algorithm. Discover the technical challenges and solutions involved in migrating a live cryptocurrency network to post-quantum cryptography while maintaining performance, interoperability, and trust. Examine the real-world implementation of quantum-safe algorithms that protect against future quantum attacks capable of recovering private keys, and gain insights into the urgency and feasibility of preparing blockchain infrastructure for the post-quantum era.