What is the difference between Optimistic rollups and Zero-knowledge (ZK) rollups?

The ZK rollups might have a better appeal in ZK rollups vs optimistic rollups comparison for the element of cryptographic proof. However, they could not be the recommended option for scaling in all cases. A high-level overview of the comparison between ZK rollups and optimistic rollups shows some insights into differences between them.

In the case of optimistic rollups, transactions are assumed as valid, while zk-rollups rely on computation verification of state transitions through validity proofs. However, optimistic rollups are better production-ready with easier programmability. In addition, optimistic rollups also facilitate effective use of EIP-4844 for ensuring cost efficiency. Therefore, optimistic rollups turn out to be the better alternative in reality.

Mike Mendoza, https://twitter.com/0xdecaff