How do optimistic rollups compare to zk-rollups?

What are optimistic rollups and zk-rollups?

Optimistic rollups and zk-rollups are both Layer 2 scaling solutions for blockchains. Optimistic rollups assume transactions are valid by default and only check them if challenged, while zk-rollups use zero-knowledge proofs to validate transactions off-chain before submitting them to the main chain.

What are the main advantages of each?

Optimistic rollups are simpler and can support any Ethereum smart contract, making them versatile. Zk-rollups, on the other hand, offer better security and faster finality due to their cryptographic proofs, but they can be more complex to implement.

Which one is better for scalability?

It depends on the use case. Optimistic rollups can handle a higher volume of transactions, while zk-rollups provide faster transaction verification and lower costs, making them more efficient for certain applications.

Are there any projects using these technologies?

Yes, several projects are utilizing these technologies. For instance, Optimism and Arbitrum are popular optimistic rollup solutions, while zkSync and StarkWare are well-known for their zk-rollup implementations.