Bitcoin has attracted considerable attention from governments, banks, as well as researchers. However, Bitcoin is not a completely anonymous system. All transaction information in the Bitcoin system is published on the network and can be used to reveal the identity of the user by transaction correlation analysis. In this paper, a secure and privacy-preserving mix service for Bitcoin anonymity, Lockmix, is proposed. Lockmix introduces mix servers to provide a mix service for the user by using blind signature and multi-signature schemes to prevent attackers from linking the input address with the output address. Lockmix provides anonymity, scalability, accountability, Bitcoin compatibility and anti-theft. Lockmix has been implemented on a Bitcoin test network, and experiments show that our solution is efficient.

中文翻译：

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Lockmix：用于比特币匿名的安全和隐私保护混合服务

比特币已引起政府，银行和研究人员的相当大的关注。但是，比特币不是一个完全匿名的系统。比特币系统中的所有交易信息都发布在网络上，并且可以通过交易相关性分析来揭示用户的身份。在本文中，提出了一种用于比特币匿名的安全且可保护隐私的混合服务Lockmix。Lockmix引入了混合服务器，通过使用盲签名和多签名方案为用户提供混合服务，以防止攻击者将输入地址与输出地址链接在一起。Lockmix提供匿名性，可伸缩性，责任感，比特币兼容性和防盗功能。Lockmix已在比特币测试网络上实现，实验表明我们的解决方案是有效的。