In response to this, the main risk that has been hypothesised by this new rise of quantum computing about the systems of cryptocurrencies of today that rely mostly on the standard protocols of cryptography, which will also require them to become quantum-proof. The article discusses the methodology of research towards the integration of PQC and the underlying consensus mechanism of a blockchain to augment security against attack by a quantum computer and hence keep its pace with conventional performance and other scalabilities prevalent in the systems of today. This includes extensive analysis of vulnerabilities in blockchain, designing hybrid quantum-resilient consensus protocols, and PQC algorithms like lattice-based encryption and NTRU encryption. Simulations have shown that adding PQC greatly increases the immunity of the blockchain against quantum attackers without considerable loss to its scalability, throughput, or energy efficiency. The study’s outcome will be the validation of the reality of practical quantum-resistant blockchain systems and building up robust solid ground for blockchain networks in the post-quantum era. This research describes critical needs and highlights the importance of making blockchain infrastructure ready for the quantum revolution with all its alterations in bringing integrity into data along with secure network architectures in anticipation of breakthrough technologies in the near future.