Cross-Channel: Scalable Off-Chain Channels Supporting Fair and Atomic Cross-Chain Operations

Yihao Guo, Minghui Xu, Dongxiao Yu, Yong Yu, Rajiv Ranjan, Xiuzhen Cheng

Abstract: Cross-chain technology facilitates the interoperability among isolated blockchains on which users can freely communicate and transfer values. Existing cross-chain protocols suffer from the scalability problem when processing on-chain transactions. Off-chain channel, as a promising blockchain scaling technique, can enable micro-payment transactions without involving on-chain transaction settlement. However, existing channel schemes can only be applied to operations within a single blockchain, failing to support cross-chain services. Therefore in this paper, we propose <inline-formula><tex-math notation="LaTeX">$\mathsf {Cross}$</tex-math></inline-formula> - <inline-formula><tex-math notation="LaTeX">$\mathsf {Channel}$</tex-math></inline-formula> , the first off-chain channel to support cross-chain services. We introduce a novel hierarchical channel structure with a hierarchical interaction protocol, a new hierarchical settlement protocol, and a smart general fair exchange protocol, to ensure scalability, fairness, and atomicity of cross-chain interactions. Besides, <inline-formula><tex-math notation="LaTeX">$\mathsf {Cross}$</tex-math></inline-formula> - <inline-formula><tex-math notation="LaTeX">$\mathsf {Channel}$</tex-math></inline-formula> provides strong security and practicality by avoiding high latency in asynchronous networks.Through a 50-instance deployment of <inline-formula><tex-math notation="LaTeX">$\mathsf {Cross}$</tex-math></inline-formula> - <inline-formula><tex-math notation="LaTeX">$\mathsf {Channel}$</tex-math></inline-formula> on AliCloud, we demonstrate that <inline-formula><tex-math notation="LaTeX">$\mathsf {Cross}$</tex-math></inline-formula> - <inline-formula><tex-math notation="LaTeX">$\mathsf {Channel}$</tex-math></inline-formula> is well-suited for processing cross-chain transactions in high-frequency and large-scale, and brings a significantly enhanced throughput with a small amount of gas and delay overhead.