Q » What is a rollup (Optimistic / ZK) in blockchain scaling?

02 Nov, 2025

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A » Rollups, including Optimistic and Zero-Knowledge (ZK) rollups, are layer-2 scaling solutions in blockchain technology. Optimistic rollups assume transactions are valid and only check for fraud when challenged, while ZK rollups use cryptographic proofs to ensure transaction validity. Both methods aim to improve transaction throughput and reduce costs by processing transactions off-chain and submitting summarized data to the main blockchain.

Michael

03 Nov, 2025

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All Other Answer

A »A rollup is a blockchain scaling solution that batches transactions off-chain and settles them on the main chain. Optimistic rollups assume validity and use fraud proofs, while ZK rollups use zero-knowledge proofs to validate transactions, enhancing scalability and reducing costs.

David

03 Nov, 2025

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