关键词: 双重花费攻击, 比特币, 区块链, 预挖掘双重花费模型

Abstract: Double-spending attacks are also called “double-spending” attacks, which use the digital characteristics of Bitcoin to complete two or more payments with “the same money”. Firstly, the types of double expenditures?are summarized, and the existing double spending models are compared, and their advantages and disadvantages are analyzed. Then a pre-excavation double spending model is constructed, ?and it has a block advantage when it comes to double spending attacks?because of having considered?that the nodes have been excavated for a period of time before the attack. The applicable conditions of the model are set and the model?is solved. Based on the experimental data, the correctness of the constructed model is verified by comparison with the existing model. Finally, based on the research on the double spending in the blockchain, two methods for resisting the double spending attack in the blockchain are given, which provides a certain reference value for the blockchain-based virtual currency to resist the double spending attack.

Key words: double spending attack, Bitcoin, blockchain, pre-excavation double spending model