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Finality
Finality reflects the time required to achieve ordering finality, after which transactions cannot be reverted or reordered. The values shown do not include the additional overhead time required to reach L1 finality, which remains the same for all projects. The actionable settlement time on L1 (which affects when you can withdraw funds) may be longer. For more details on how finality works for L2 transactions, check our article.
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.
