ZK-Rollup (Zero-Knowledge Rollup)
Overview
A ZK-Rollup (Zero-Knowledge Rollup) is an advanced layer-2 scaling solution that increases blockchain throughput by bundling (rolling up) hundreds of off-chain transactions into a single batch and generating a cryptographic proof of validity.
How It Works
Instead of verifying every transaction individually on the mainnet (like Ethereum), the ZK-Rollup executes the computations off-chain. It then generates a Zero-Knowledge Proof (usually a zk-SNARK or zk-STARK) that verifies the correctness of the batch and submits this proof to the mainnet.
Advantages
ZK-Rollups offer significant scalability improvements, lower gas fees, and instant transaction finality compared to Optimistic Rollups, which require a dispute challenge window. They maintain the full cryptographic security of the underlying layer-1 network.