Authors - Hiep. L. Thi Abstract - Recent advances in quantum computing threaten the cryptographic foundations of blockchain systems. While existing surveys analyze quantum resistant blockchain architectures at the system level, wallet-layer migration and threshold post-quantum signing mechanisms remain underexplored. This paper proposes a post-quantum secure cryptocurrency wallet architecture based on code based threshold signatures. We introduce a formal quantum-adversarial wallet model, design a modular wallet framework, provide a security reduction argu ment under syndrome decoding hardness, and outline a migration-compatible de ployment strategy
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