Optimistic Rollups

Optimistic rollups assume that all transactions are valid by default unless proven otherwise.

Fraud Proof Mechanism

Optimistic rollups operate on a trust assumption that transactions are valid unless proven otherwise. They do not proactively prove the correctness of transactions. Instead, during the challenge window, if a transaction is suspected to be fraudulent, a fraud proof can be computed and submitted. Should this proof be validated, the transaction in question is re-executed, the rollup's state is adjusted, and the offending sequencer is penalized.

This mechanism is crucial for maintaining the security and trustworthiness of the rollup environment but comes at the cost of user experience due to the withdrawal waiting time.

Disadvantages of Optimistic Rollups: Withdrawal Delays and Fraud Challenges

Optimistic rollups are a popular scaling solution for Ethereum that help increase transaction throughput by batching multiple transactions off-chain and only posting the summary to Layer 1 (L1) as call data. However, one significant drawback they present is the withdrawal delay due to the challenge period.

Withdrawal Delays

When users transact within optimistic rollups, their ability to withdraw tokens back to the main chain is subject to a waiting period, typically lasting around seven days. This challenge period is designed to ensure the integrity of transactions by providing a window for any observer to contest transaction validity.

Deploy with Arbitrum Rollups through DappChain

Deploy your application efficiently using the innovative technology of Arbitrum Rollups via DappChain for enhanced scalability and reduced gas fees.