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

TL;DR

Cross-Channel introduces a scalable off-chain protocol that enables fair, atomic, and efficient cross-chain transactions, overcoming existing limitations of on-chain processing and single-chain channels.

Contribution

It presents the first off-chain cross-chain channel with hierarchical structure, novel settlement, and fair exchange protocols for scalable and secure cross-chain operations.

Findings

Demonstrated high throughput on AliCloud deployment

Achieved low latency and minimal gas overhead

Supported large-scale, high-frequency cross-chain transactions

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 channels, 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 Cross-Channel, the first off-chain channel to support cross-chain services. We introduce a novel hierarchical channel structure, a new hierarchical settlement protocol, and a smart general fair exchange protocol, to ensure scalability, fairness, and atomicity of cross-chain interactions. Besides, Cross-Channel provides strong security and practicality by avoiding high latency in asynchronous networks. Through a 50-instance deployment of Cross-Channel on AliCloud, we demonstrate that Cross-Channel 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.