Optimistic Rollups is a Layer 2 (L2) protocol designed to scale the throughput of the Ethereum base layer. So what exactly is Optimistic Rollup and what are the risks of roll up? Let's find out by reading this article.
What is an Optimism rollup?
Optimistic Rollup is a Layer 2 scaling solution. A layer 2 solution is a network that removes some processing from the main (or layer 1) Ethereum chain in order to improve performance. The goal of optimistic aggregation is to reduce latency - the time it takes to confirm a transaction, currently limited by Ethereum's block time of about 13 seconds - and increase transaction throughput - the number of transactions that can be processed per second - thereby reducing gas fees. Optimistic Rollup still uses the Ethereum mainchain for consensus and security compared to sidechain solutions.
The nice thing about Optimistic rollup is that it's fast; by assuming things are correct, the network doesn't have to waste time confirming things. The downside is that it usually takes about a week to officially withdraw your funds from popular networks like Optimism or Arbirtrum.
How do optimistic rollups work?
From a high-level perspective, the main components that make the system work are the Rollup itself, the Sequencer, the Adjudicator (or Fraud Proof Contract), and the Optimistic Virtual Machine. Rollups are regular smart contracts on the Ethereum mainnet that act as relays between the main chain and layer 2, where computation happens. Rollups receive transaction data, send it to layer 2, and receive the results of layer 2 calculations.
Risk of Optimism Rollup
Many aggregates also continue to rely on centralized "orderers" to efficiently coordinate transactions on the layer 2 chain. A sequencer cannot cheat or alter transactions, but it can technically review or reorder transactions to extract some benefit for itself.
Rollups usually plan to be decentralized in some form. Optimism started the transition to community governance earlier this year, and advances in Rollup technology should improve some of the issues surrounding centralized network control. Optimistic rollups allow anyone to publish blocks without providing proof of validity. However, to ensure that the chain remains secure, optimistic rollups specify a time window during which anyone can dispute a state transition.
I hope now you will understand what is optimism rollup and risk of optimism rollup. Optimistic Rollup can help developers facilitate decentralized application development in a unique way without the burden of cost and speed.
