TrustCross: Enabling Confidential Interoperability across Blockchains Using Trusted Hardware

TL;DR

TrustCross is a privacy-preserving platform that enables confidential cross-chain communication using trusted hardware, ensuring privacy and scalability across heterogeneous blockchains.

Contribution

It introduces a novel approach combining trusted execution environments and fine-grained access control for confidential cross-chain interoperability.

Findings

Achieves reasonable latency in cross-chain contract calls.

Demonstrates high scalability across heterogeneous blockchains.

Provides effective privacy protection for user data.

Abstract

With the rapid development of blockchain technology, different types of blockchains are adopted and interoperability across blockchains has received widespread attention. There have been many cross-chain solutions proposed in recent years, including notary scheme, sidechain, and relay chain. However, most of the existing platforms do not take confidentiality into account, although privacy has become an important concern for blockchain. In this paper, we present TrustCross, a privacy-preserving cross-chain platform to enable confidential interoperability across blockchains. The key insight behind TrustCross is to encrypt cross-chain communication data on the relay chain with the assistance of trusted execution environment and employ fine-grained access control to protect user privacy. Our experimental results show that TrustCross achieves reasonable latency and high scalability on the contract calls across heterogeneous blockchains.