RollupNet: Trustless State Channels for Real-Time Cross Rollup Contract Execution

As a leading approach to improving the scalability of Ethereum, Rollup projects (e.g., Arbitrum) have proliferated in recent years, leading to an increased demand for cross-Rollup solutions. Unfortunately, existing cross-Rollup solutions are either slow and expensive or unsuitable for complex cross-Rollup interaction. We present ROLLUPNET, the first state channel that synchronously executes cross-Rollup contracts to support complex cross-Rollup applications while providing both security and efficiency guarantees. To prevent parties from misbehaving, we design an Ethereum-based dispute resolution to ensure the consistency of state between different Rollups. The results show that the ROLLUPNET is practical for Ethereum Rollups.