论文标题
分散的资产监护计划，具有针对理性对手的安全性
Decentralized Asset Custody Scheme with Security against Rational Adversary
论文作者
论文摘要
资产监护权是一项核心金融服务，在该服务中，保管人代表客户持有安全保存资产。尽管传统的监护权服务通常得到集中式当局的认可，但自数字资产的出现以来，分散的监护计划在技术上变得可行，此外，诸如区块链和DEFI（分散财务）之类的新应用程序非常需要。 在这项工作中，我们提出了一个分散资产监护计划的框架，该框架能够支持大量的保管人，并安全地持有多倍的客户资产的总保证金价值。拟议的监护计划通过组合设计将托管人和资产分配给许多托管群体，每个组都完全控制了分配的资产。由于每个托管人群都很小，因此高架成本大大降低。耐受性也得到了提高，因为即使是一个活着的组也能够处理交易。 在理性对手模型下保证了这种监护计划的安全性，以便任何对手损害有限的托管人的对手不能将资产搬迁比支付的保证金更多。我们进一步分析了从理论和实验方面分析我们的结构的安全性和性能，并提供具有具体数字和数字的明确示例，以更好地理解我们的结果。
Asset custody is a core financial service in which the custodian holds in-safekeeping assets on behalf of the client. Although traditional custody service is typically endorsed by centralized authorities, decentralized custody scheme has become technically feasible since the emergence of digital assets, and furthermore, it is greatly needed by new applications such as blockchain and DeFi (Decentralized Finance). In this work, we propose a framework of decentralized asset custody scheme that is able to support a large number of custodians and safely hold customer assets of multiple times the value of the total security deposit. The proposed custody scheme distributes custodians and assets into many custodian groups via combinatorial designs, where each group fully controls the assigned assets. Since every custodian group is small, the overhead cost is significantly reduced. The liveness is also improved because even a single alive group would be able to process transactions. The security of this custody scheme is guaranteed under the rational adversary model, such that any adversary corrupting a bounded fraction of custodians cannot move assets more than the security deposit paid. We further analyze the security and performance of our constructions from both theoretical and experimental sides and give explicit examples with concrete numbers and figures for a better understanding of our results.
