Roundabout:一种基于燃烧证明的比特币隐私保护方法

Roundabout:a Method of Bitcoin Privacy Protection Based on Proof of Burn

比特币区块链以其去中心化和不可篡改的特性引领了加密货币市场的火爆现状,比特币现有的系统框架所存在的一些问题成为了制约其发展的重要原因。1)比特币物理性能较低,交易速率过慢,完全无法满足日益增长的交易需求,极大的制约了比特币的应用;2)比特币虽然具有匿名性,但由于交易所等机构的发展,比特币无法实现完全的匿名性,存在泄露参与者真实身份的风险。论文提出了一种在比特币侧链上的区块链方法——Roundabout,采用一种类似燃烧证明(PoB)的共识机制。用户将任意数量的比特币发送至某个特定的地址,将原来比特币的UTXO经过Musig签名算法加密,将密文作为Roundabout链代币的UTXO模型的第一个输入,因此每个代币的UTXO都对应一个比特币的UTXO模型。经过特定的回合后,系统会将比特币分发给用户的地址,并将交易信息在比特币链上广播。通过该方式,能极大地提升比特币的交易速率,并能充分保证隐私性。

Bitcoin blockchain has led the hot current situation of the cryptocurrency market with its decentralized and un⁃changeable characteristics.Some problems in the existing system framework of Bitcoin have become important reasons restricting its development.1)Bitcoin's physical performance is low,and the transaction rate is too slow,Which is completely unable to meet the growing transaction demand,which greatly restricts the application of Bitcoin.2)Although Bitcoin has anonymity,due to the devel⁃opment of exchanges and other institutions,Bitcoin cannot achieve complete anonymity,and there is a risk of revealing the true identity of participants.This article proposes a blockchain method on the Bitcoin side chain—Roundabout,which uses a consensus mechanism similar to Proof of Burn(PoB).The user sends any number of Bitcoins to a specific address,encrypts the UTXO of the original Bitcoin with the Musig signature algorithm,and uses the ciphertext as the first input of the UTXO model of the side chain to⁃ken.Therefore,the value of each token is UTXO corresponds to a Bitcoin UTXO model.After a specific round,the system will dis⁃tribute Bitcoin to the user's address and broadcast the transaction information on the Bitcoin chain.In this way,in theory,the trans⁃action rate of Bitcoin can be greatly improved,and privacy can be fully guaranteed.