Blockchain technology has gained signi cant prominence in recent years due to its public,distributed, and decentration characteristics, which was widely applied in all walks of life requiringdistributed trustless consensus. However, the most cryptographic protocols used in the current blockchainnetworks are susceptible to the quantum attack with rapid development of a suf ciently large quantumcomputer. In this paper, we rst give an overview of the vulnerabilities of the modern blockchain networksto a quantum adversary and some potential post-quantum mitigation methods. Then, a new lattice-basedsignature scheme has been proposed, which can be used to secure the blockchain network over existingclassical channels. Meanwhile, the public and private keys are generated by the Bonsai Trees technologywith RandBasis algorithm from the root keys, which not only ensure the randomness, but also construct thelightweight nondeterministic wallets. Then, the proposed scheme can be proved secure in random oraclemodel, and it is also more ef cient than similar literatures. In addition, we also give the detailed descriptionof the post-quantum blockchain transaction. Furthermore, this work can help to enrich the research on thefuture post-quantum blockchain (PQB).
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