Optimistic rollup

A type of rollup that posts its blocks to a parent chain without any cryptographic proofs that attest to their validity. The parent chain receives the block with the corresponding signatures and optimistically assumes the transactions are correct.

If a block is suspected to be invalid, a dispute window is provided where the blocks are open to be challenged. If a block is challenged, a fraud proof will be used to verify whether it is invalid. Once the dispute window has closed, the block is considered final and no new challenges can be made.