TrustCross: Enabling Confidential Interoperability across Blockchains Using Trusted Hardware
This addresses privacy concerns for users and developers in blockchain interoperability, though it is incremental as it builds on existing cross-chain methods.
The paper tackles the problem of enabling confidential interoperability across blockchains by proposing TrustCross, a privacy-preserving cross-chain platform that encrypts communication data using trusted execution environments and fine-grained access control, achieving reasonable latency and high scalability in experiments.
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.