Understanding Ethereum Scaling Solutions - How Rollup Works

Author: Ed Felten. Arbitrum Rollup is an off-chain protocol managed by on-chain Ethereum contracts. A dapp developer has a set of contracts written in Solidity, the developer compiles these contracts into the Arbitrum Virtual Machine (VM) to run on Arbitrum Rollup. You hope they run quickly. Rollup Basics. Let's start with the basics.