Universal Blockchain applications have created fears and uncertainties regarding their encryption pattern, especially in overpowering quantum computers. Blockchain is secured by classical cryptography that can be soon cracked by powerful quantum computers. This paper begins with an analysis of how the achievement of quantum supremacy in the near future may threaten existing consensus or cryptographic models that are used in blockchains today. As a result, we suggest applying Post-quantum Cryptography (PQC) in a quantum-safe blockchain environment. Using PQC algorithms, the authors of this study explain how blockchain networks can be protected from quantum attacks. Alongside this, we explain how quantum communication technology can help protect blockchains, estimate the real-world possibilities of creating a quantum-proof blockchain space, and identify possible technical issues. Finally, we provide a rationale to support the idea that the integration of PQC is a feasible approach toward securing blockchain systems for future quantum computing.