Optimistic Rollups In a previous discussion, we talked about | House Of Chimera

Optimistic Rollups

In a previous discussion, we talked about ZK-rollups. Another popular scaling method are Optimistic (OP) rollups, combining ZK-rollups and Plasma aspects . Unlike Plasma, OP rollups post transactional data and state roots on the main chain, using the main chain as a data layer.

OP rollups rely on Fraud proofs, similar to Plasma's fraud proofs. The OP rollup design uses multiple aggregators (i.e., block producers). Each aggregator must deposit a bond when posting a new rollup block.

If a user identifies an invalid state root (i.e., a block with invalid transactions), they can challenge the aggregator by posting the valid state root with required Merkle proofs to prove it. If the user is correct , the bond and the created block of the aggregator get slashed.

Be sure to check out the upcoming post, where we'll compare OP and ZK rollups side-by-side!