Similar “proof” technology is used by all layer-2 rollup networks, including Optimism competitors like Arbitrum. It’s meant to ensure that a rollup’s users–be they NFT traders, retail investors, or big-name financial institutions–can trust Ethereum’s sprawling operator network, rather than the rollup’s own internal systems, to record their transactions and withdrawals accurately.
![Optimism Finally Gets Its Mission-Critical ‘Fault Proofs’ Optimism Finally Gets Its Mission-Critical ‘Fault Proofs’](https://www.coindesk.com/resizer/EUdSI5siB0Nzv4QdN2OE-APRbBM=/1200x628/center/middle/cloudfront-us-east-1.images.arcpublishing.com/coindesk/SVHCF4IP2ZHVFOSUAH3K2BGDEQ.jpeg)