Current securities settlement systems employ various strategies to manage risks in settlement effectively. However, exchanging and verifying information between the market participants and intermediaries is time consuming.In addition, the back office and coordination costs are very high. To address such challenges, blockchain technology has attracted the attention of researchers due to its potential as a new settlement system. In this study, we propose a blockchain-based settlement system using cross-chain atomic swaps that can be implemented for the central banks digital currency (CBDC). The proposed model adds an administrator ledger to the system to remove settlement failure and improve efficiency in market management. Along with our settlement system, we also propose a new lattice-based sequential aggregate signature scheme generally known for its advantage on resisting future quantum attacks. Proof-of-concept experiments with the proposed system were conducted to analyze the effect of numerous variables in the blockchain ecosystem on the settlement system.

当前的证券结算系统采用各种策略来有效管理结算风险。但是，市场参与者和中介机构之间的信息交换和验证非常耗时。另外，后台和协调成本非常高。为了应对这些挑战，区块链技术因其作为一种新的结算系统的潜力而引起了研究人员的关注。在这项研究中，我们提出了一种基于区块链的结算系统，该系统使用可以为中央银行数字货币 (CBDC) 实施的跨链原子交换。所提出的模型在系统中添加了管理员分类帐，以消除结算失败并提高市场管理效率。连同我们的结算系统，我们还提出了一种新的基于格的顺序聚合签名方案，因其在抵抗未来量子攻击方面的优势而广为人知。对所提出的系统进行了概念验证实验，以分析区块链生态系统中众多变量对结算系统的影响。