An Optimistic Rollup is a Layer 2 scaling solution that was developed to enhance the performance of a blockchain, in particular Ethereum, by making it faster and less expensive to operate. An optimistic rollup does not limit itself to just processing transactions on the main chain, but rather batches its workload off the chain and only reports a summary of the transactions back to Ethereum. By doing so, the system not only relieves congestion but also slashes costs while still depending on the security of Ethereum.
The term “optimistic” is derived from the manner in which these rollups treat validation. They operate on the optimistic assumption that transactions are valid unless proven otherwise. Users don’t need to do heavy calculations while submitting. Rather, the system provides an interval for the other users to dispute a transaction if they suspect that there is an error. If a user submits a valid fraud proof during that time span, the rollup reverts the invalid state, discards the batch, and penalizes the proposer.
The main benefit of these optimistic rollups is to process large transactions at once. The likes of Optimism, Arbitrum, and Base have all adopted this model and as a result, have their users enjoying a smoother experience with lower gas costs.
Taking advantage of off-chain speed alongside on-chain security, optimistic rollups effectively make Ethereum scale, without having to give up the aspect of decentralization. They have been one of the essential breakthroughs that are leading the way for the blockchain technology to reach the mass markets by making the daily transactions faster and cheaper as well as more user-friendly.
Your completely free resource hub designed to boost your knowledge of cryptocurrencies