SoK: TEE-assisted confidential smart contract

Rujia Li, Qin Wang, Qi Wang, David Galindo, Mark Ryan

Research output: Contribution to journalConference articlepeer-review

38 Downloads (Pure)


The blockchain-based smart contract lacks privacy since the contract state and instruction code are exposed to the public. Combining smart-contract execution with Trusted Execution Environments (TEEs) provides an efficient solution, called TEE-assisted smart contracts, for protecting the confidentiality of contract states. However, the combination approaches are varied, and a systematic study is absent. Newly released systems may fail to draw upon the experience learned from existing protocols, such as repeating known design mistakes or applying TEE technology in insecure ways. In this paper, we first investigate and categorize the existing systems into two types: the layer-one solution and layer-two solution. Then, we establish an analysis framework to capture their common lights, covering the desired properties (for contract services), threat models, and security considerations (for underlying systems). Based on our taxonomy, we identify their ideal functionalities and uncover the fundamental flaws and reasons for the challenges in each specification design. We believe that this work would provide a guide for the development of TEE-assisted smart contracts, as well as a framework to evaluate future TEE-assisted confidential contract systems.
Original languageEnglish
Pages (from-to)711-731
Number of pages21
JournalProceedings on Privacy Enhancing Technologies
Issue number3
Publication statusPublished - 9 Aug 2022


  • cs.CR
  • Confidential Smart Contract
  • Blockchain
  • Trusted Execution Environment (TEE)


Dive into the research topics of 'SoK: TEE-assisted confidential smart contract'. Together they form a unique fingerprint.

Cite this