ABSTRACT Considering significant progress as well as developments in the quantum computing field, modern cryptography algorithms and technologies like cryptocurrencies, NFT (non-fungible token) marketplaces, and other blockchain-based systems would be in jeopardy. If quantum computers keep evolving, they will eventually be able to break through the encryption of modern cryptography algorithms. Once encryption of these systems is compromised, they become unsafe and mutable. In this paper, we propose a blockchain system like bitcoin not vulnerable to a cryptanalytic attack by a quantum computer running Shors or Grovers algorithm. This system is achieved by implementing post-quantum cryptography in the blockchain. Keywords: Post-quantum cryptography, Blockchain, Quantum computing.