基于改进哈希时间锁的区块链跨链资产交互协议  

Novel Hash-time-lock-contract Based Cross-chain Token Swap Mechanism of Blockchain

作　　者：刘峰[1,2,4] 张嘉淏 周俊杰 利牧 孔德莉 杨杰 齐佳音 周爱民[1,4] LIU Feng;ZHANG Jia-hao;ZHOU Jun-jie;LI Mu;KONG De-li;YANG Jie;QI Jia-yin;ZHOU Ai-min(School of Computer Science and Technology,East China Normal University,Shanghai 200062,China;Institute of Artificial Intelligence and Change Management,Shanghai University of International Business and Economics,Shanghai 200336,China;School of Business and Management,Shanghai International Studies University,Shanghai 201620,China;Institute of Intelligent AI Education,East China Normal University,Shanghai 200062,China)

机构地区：[1]华东师范大学计算机科学与技术学院,上海200062 [2]上海对外经贸大学人工智能与变革管理研究院,上海200336 [3]上海外国语大学国际工商管理学院,上海201620 [4]华东师范大学智能教育研究院,上海200062

出　　处：《计算机科学》2022年第1期336-344,共9页Computer Science

基　　金：国家自然科学基金(72042004)。

摘　　要：区块链是近年来炙手可热的技术话题之一,与其相关的研究理论正在不断丰富。然而,距离区块链技术落地仍面临着吞吐量小、处理效率低的关键问题。针对该问题,跨链技术作为一种有潜力,同时具备扩大吞吐量处理能力、提升处理效率的区块链技术而被广泛关注。文中给出了一种基于改进哈希时间锁的跨链资产交互协议(A Novel Hash-Time-Lock-Contract Based Cross-Chain Token Swap Mechanism,NCASP),创造性地为Fabric区块链引入账户体系,融合智能合约技术实现了在以太坊和Fabric联盟链网络之间的安全无缝资产交换。NCASP协议在每笔HTLC(Hash Time Lock Contract)转账中设置了不同的中间账户进行资产托管和转移,并在交易完成后及时销毁,使得在原有跨链交易速率不变的同时,保证了交易的安全性。通过对协议进行仿真模拟表明,该协议适用于以Fabric为代表的联盟链与比特币以及以以太坊为代表的公链,无需第三方区块链介入,即可实现高效安全的跨链资产交换,且在交易效率上比BSN(Blockchain Service Network)的跨链方案节省了约26.8%。改进的协议扩展了传统HTLC跨链资产方案的使用场景,使不同用户间的资产交换兼顾原子性、公平性以及透明性的特点。Blockchain is one of the technical hotspots in recent years,and the research theories related to it are being enriched.However,it is still facing the key problem of small throughput and low processing efficiency before it can be implemented into the industry.In response to this problem,cross-chain technology has been widely focused as a blockchain technology that has the potential to both expand throughput processing capacity and improve processing efficiency.This paper presents a novel hash-timelock-contract based cross-chain token swap mechanism (NCASP),which creatively introduces an account system for the Fabric blockchain and integrates smart contract technology to achieve secure and seamless asset exchange between the Ethernet and Fabric blockchain network.The NCASP protocol sets up different intermediate accounts for asset escrow and transfer in each HTLC transfer,and destroys them in time after the transaction is completed,making the original cross-chain transaction rate unchanged while ensuring the security of the transaction.Simulation of the protocol shows that the protocol is applicable to the federated chain represented by Fabric and the public chains represented by Bitcoin and Ethernet,can achieve efficient and secure cross-chain asset exchange without the intervention of third-party blockchains,and can save about 26.8%in transaction efficiency compared with the cross-chain scheme of BSN (blockchain service network).The improved protocol extends the usage scenarios of the traditional HTLC cross-chain asset schemes,enabling the exchange of assets between different users with a balance of atomicity,fairness and transparency.

关 键 词：区块链跨链技术 哈希时间锁 资产交换 中间人账户 以太坊 Fabric 

分 类 号：TP309.2[自动化与计算机技术—计算机系统结构]