Decentralized Finance (DeFi), a blockchain powered peer-to-peer financial system, is mushrooming. One and a half years ago the total value locked in DeFi systems was approximately $700$m USD, now, as of September 2021, it stands at around $100$bn USD. The frenetic evolution of the ecosystem has created challenges in understanding the basic principles of these systems and their security risks. In this Systematization of Knowledge (SoK) we delineate the DeFi ecosystem along the following axes: its primitives, its operational protocol types and its security. We provide a distinction between technical security, which has a healthy literature, and economic security, which is largely unexplored, connecting the latter with new models and thereby synthesizing insights from computer science, economics and finance. Finally, we outline the open research challenges in the ecosystem across these security types.
翻译：分散化金融(DeFi)是一连串权力的同侪对等金融体系(DeFi ), 正在蓬勃发展。 一年半前,DeFi系统锁定的总价值约为700万美元,现在,截至2021年9月,该体系目前约为100美元左右。 生态系统的疯狂演变在理解这些体系的基本原则及其安全风险方面带来了挑战。 在知识系统化(SoK)中,我们沿着以下轴线界定了DeFi生态系统:其原始体、其操作协议类型及其安全。 我们区分了技术安全(它拥有健康的文献)和经济安全(它基本上尚未探索),后者与新模式连接起来,从而综合了计算机科学、经济和金融的洞见。 最后,我们概述了这些安全类型生态系统的公开研究挑战。
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