pose-practical-off-chain-smart-contract-execution@NDSS

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#1 POSE: Practical Off-chain Smart Contract Execution [PDF] [Copy] [Kimi1]

Authors: Tommaso Frassetto (Technical University of Darmstadt) ; Patrick Jauernig (Technical University of Darmstadt) ; David Koisser (Technical University of Darmstadt) ; David Kretzler (Technical University of Darmstadt) ; Benjamin Schlosser (Technical University of Darmstadt) ; Sebastian Faust (Technical University of Darmstadt) ; Ahmad-Reza Sadeghi (Technical University of Darmstadt)

Smart contracts enable users to execute payments depending on complex program logic. Ethereum is the most notable example of a blockchain that supports smart contracts leveraged for countless applications including games, auctions and financial products. Unfortunately, the traditional method of running contract code on-chain is very expensive, for instance, on the Ethereum platform, fees have dramatically increased, rendering the system unsuitable for complex applications. A prominent solution to address this problem is to execute code off-chain and only use the blockchain as a trust anchor. While there has been significant progress in developing off-chain systems over the last years, current off-chain solutions suffer from various drawbacks including costly blockchain interactions, lack of data privacy, huge capital costs from locked collateral, or supporting only a restricted set of applications. In this paper, we present POSE—a practical off-chain protocol for smart contracts that addresses the aforementioned shortcomings of existing solutions. POSE leverages a pool of Trusted Execution Environments (TEEs) to execute the computation efficiently and to swiftly recover from accidental or malicious failures. We show that POSE provides strong security guarantees even if a large subset of parties is corrupted. We evaluate our proof-of-concept implementation with respect to its efficiency and effectiveness.