Decentralized Finance (Defi)
SoK: Decentralized Finance (DeFi) Sam M. Werner1, Daniel Perez1, Lewis Gudgeon1, Ariah Klages-Mundt2, Dominik Harz1, and William J. Knottenbelt1 1 Imperial College London 2 Cornell University Abstract. 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 700m USD, now, as of September 2021, it stands at around 100bn USD. The frenetic evolution of the ecosystem has created challenges in understanding the basic prin- ciples of these systems and their security risks. In this Systematization of Knowledge (SoK) we delineate the DeFi ecosystem along the follow- ing 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, connect- ing 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. Keywords: Decentralized Finance, DeFi, Smart Contracts, Cryptocur- rencies 1 DeFi: Finance 2.0? Consider two views on the promise of Decentralized Finance (DeFi). For the DeFi Optimist, DeFi amounts to a breakthrough technological advance, offering a new financial architecture that is non-custodial, permissionless, openly au- ditable, (pseudo)anonymous, and with potentially new capital efficiencies. Ac- cording to this view, DeFi generalizes the promise at the heart of the original Bitcoin whitepaper [100], extending the innovation of non-custodial transactions to complex financial operations. In contrast, the DeFi Pessimist is concerned that, inter alia, the unregulated, hack-prone DeFi ecosystem serves to facilitate arXiv:2101.08778v5 [cs.CR] 26 Sep 2021 unfettered and novel forms of financial crime.
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