A Regulatable Digital Currency Model Based on Blockchain
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摘要: 以比特币为代表的数字货币具有去中心化特性，造成了监管上的困难.然而，针对去中心化的数字货币可监管研究工作相对较少，还有很多问题有待解决.提出了一种可监管的数字货币模型.该模型采用了双链结构设计，联盟链作为共识的核心参与者，收集和确认交易，决定系统的状态，加密存储完整的交易信息.联盟链参与者通过秘密共享保证用户交易数据的隐私性，也可以通过投票完成对交易内容的解密，以此来实现可控匿名.针对该模型，同时提出了一种基于信用的拜占庭容错机制.该机制配合简化的一致性协议以及检查点协议，让节点能够动态优化调整，促进整个模型进入良性循环.实验结果表明：该方法在保护用户隐私的前提下具有交易防篡改、可追溯、去中心化以及可监管的能力.容错性能、运行效率以及通信开销均达到设计要求.Abstract: The digital currency, represented by Bitcoin, was designed to be a decentralized system. And this property makes the regulation more difficult. However, the research of designing a regulatable digital currency is very limited. In this paper, we introduce a new digital currency model based on two chains scheme, public blockchain and consortium blockchain. As the core participant, the consortium blockchain collects and confirms every transaction, determines the status of the system, and stores the complete transaction records. The users’ private information is guaranteed by the secret sharing in the consortium blockchain and also can be decrypted by the voting committee. Based on the characteristics and requirements of the consortium blockchain, we also introduce an agreement protocol based on the Credit Practical Byzantine Fault Tolerance and use the simplified agreement protocol to offer high throughput for our model and flexibility of the system. With the view-change and checkpoint protocol, we can dynamically adjust the nodes’ status and authority. Extensive analysis and experimental results indicate that our proposed method is both efficient and secure. We believe that this is the first work that has the capacity of the tamper-resistant, traceability, decentralize and regulation.
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Keywords:
- block chain /
- consortium chain /
- regulation /
- digital currency /
- agreement
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