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  1. Home
  2. /Glossary
  3. /Optimistic Rollup
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blockchain

Optimistic Rollup

A Layer 2 scaling solution that assumes all transactions are valid and only runs computation if someone challenges a transaction.

Definition

A Layer 2 scaling solution that assumes all transactions are valid and only runs computation if someone challenges a transaction. The 'optimistic' part means it trusts that transactions are honest unless proven otherwise. Arbitrum and Optimism are the two biggest optimistic rollups on Ethereum.

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GuideLayer 2 Solutions Guide

Related Terms

Rollup

A Layer 2 scaling solution that bundles many transactions together before posting them to the main chain.

Layer 2

A secondary network built on top of a Layer 1 to improve scalability.

ZK-Rollup

A Layer 2 scaling solution that bundles transactions off-chain and uses zero-knowledge proofs to verify them on the main chain.

ABI

Application Binary Interface.

Account Abstraction

A way to make crypto wallets behave more like normal apps by turning every account into a smart contract.

ERC-4337

The Ethereum standard for account abstraction without changing the core protocol.

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