Frassetto, Tommaso ; Jauernig, Patrick ; Koisser, David ; Kretzler, David ; Schlosser, Benjamin ; Faust, Sebastian ; Sadeghi, Ahmad-Reza (2023)
POSE: Practical Off-chain Smart Contract Execution.
Network and Distributed System Security Symposium 2023. San Diego, USA (27.02.2023-03.03.2023)
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Kurzbeschreibung (Abstract)

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.

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