Privacy-preserving And Fair Multi-chain Asset Exchange

The emergence of digital assets and blockchain technology has reformed the international monetary system and attracted significant attention from the capital market,promoting the prosperous growth of the digital asset trading market.However,existing centralized digital asset exchanges fail to comply with the technical characteristics of decentralization and pose significant risks such as asset theft and opaque settlement.In response,researchers have proposed decentralized exchanges without asset custody to enable secure trading.However,the lack of privacy protection creating opportunities for price manipulation threatens the fairness and transparency of trades and damages user interests.This thesis proposes a privacy-preserving decentralized exchange that prevents price manipulation and supports complex trades involving digital asset-based derivatives and multi-chain assets.The proposed exchange utilizes secure multi-party computation,trusted hardware,and adaptor signatures to address gaps and deficiencies in the current exchange field,ensuring the user asset security,guaranteeing fair trading,improving the circulation efficiency of digital assets,and providing more possibilities for decentralized financial technology products and services.This thesis focuses on three research areas:cross-chain trading,digital asset derivative trading,and multichain trading.The research progresses from simple to complex trading scenarios while ensuring the trade fairness and enhancing the functions of the exchange to meet the different trade needs of users.The key research achievements of this thesis are as follows.A privacy-preserving decentralized exchange scheme is proposed,which effectively protects user transaction privacy and prevents price manipulation caused by the lack of privacy protection in decentralized exchanges.The scheme combines secure multi-party computation and trusted hardware to design a privacy-preserving order matching protocol.A secure atomic settlement protocol is introduced to address privacy leaks in cross-chain transactions.Security analysis demonstrates that this scheme can protect both the fund security and transaction privacy throughout the process,effectively preventing price manipulation and maximizing trading privacy.Experimental results show that this scheme meets the efficiency requirements of privacy-preserving exchanges while maximizing trading privacy.A privacy-preserving decentralized exchange scheme is proposed,which supports trading of digital asset option contracts and prevents price manipulation.The scheme introduces a fair pricing model for option contracts based on digital assets,ensuring transaction fairness.A secure atomic settlement protocol is designed specifically for option contracts,eliminating the need for third-party participation and utilizing adaptor signature technology to protect user transaction privacy.Security analysis and experimental results demonstrate that this scheme offers secure and efficient trading services for digital asset option contract trading.A privacy-preserving decentralized exchange scheme is proposed,which supports multi-chain asset trading and prevents price manipulation.The scheme designs a trading mechanism for multi-chain asset,supporting the trading of assets on multiple chains and preventing price manipulation.A secure multi-chain atomic swap protocol based on adaptor signatures is introduced to ensure the security of user funds and transaction privacy.Security analysis and experimental results show that this scheme can effectively provide trading services for multi-chain asset trading without price manipulation.