Liveness
Please note, the values on the page do not reflect the time to finality (the time it would take for your L2 transaction to be finalized on the L1 after it has been submitted).
Rollups are L2s that periodically post state commitments to Ethereum. These commitments are validated by either Validity Proofs or are accepted optimistically and can be challenged via Fraud Proof mechanism within a certain fraud proof window. Additionally L2 data is also posted to Ethereum, hence there are no additional trust assumptions introduced.
