DECLOAK: Enable Secure and Cheap Multi-Party Transactions on Legacy Blockchains by a Minimally Trusted TEE Network
Qian Ren, Yue Li, Yingjun Wu, Yuchen Wu, Hong Lei, Lei Wang, Bangdao, Chen

TL;DR
DECLOAK is a novel framework that enables secure, efficient, and cost-effective multi-party transactions on legacy blockchains by leveraging a minimally trusted TEE network, achieving data availability and fairness with lower gas costs.
Contribution
DECLOAK introduces the first MPT framework that ensures data availability, reduces gas costs by 65.6%, and tolerates Byzantine parties with weaker assumptions.
Findings
Reduces gas costs significantly compared to state-of-the-art
Achieves data availability for multi-party transactions
Supports Byzantine fault tolerance with minimal trust
Abstract
As the confidentiality and scalability of smart contracts have become a crucial demand of blockchains, off-chain contract execution frameworks have been promising. Some have recently expanded off-chain contracts to Multi-Party Computation (MPC), which seek to transition the on-chain states by off-chain MPC. The most general problem among these solutions is MPT, since its off-chain MPC takes on- and off-chain inputs, delivers on- and off-chain outputs, and can be publicly verified by the blockchain, thus capable of covering more scenarios. However, existing Multi-Party Transaction (MPT) solutions lack at least one of data availability, financial fairness, delivery fairness, and delivery atomicity. These properties are crucially valued by communities, e.g., the Ethereum community, or users. Even worse, these solutions require high-cost interactions between the blockchain and off-chain…
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Taxonomy
TopicsBlockchain Technology Applications and Security · Cryptography and Data Security · Privacy-Preserving Technologies in Data
