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ZK-Rollup ZK-Rollup (Zero-Knowledge Rollup) is a technology solution for the Ethereum blockchain scaling specifically, which allows the network to process more transactions in a faster and cheaper manner without compromising its security. The central idea is to shift most of the computations and data storage from the primary blockchain while keeping correctness proof on-chain. A ZK-Rollup consists of merging, or “rolling up,” hundreds or even thousands of transactions into one batch. Then, a zero-knowledge proof is generated which is a type of cryptographic proof that verifies the legality of all those transactions. This proof is sent to the main blockchain allowing it to confirm the whole batch at once rather than reviewing each transaction. ZK-Rollups do confront the standard transaction surges and turn them into lower transaction fees while still keeping the network extremely secure. The main blockchain simply kept a minimal amount of information and did the proofs check as the real transaction data was being processed off-chain. ZK-Rollups remain a significant player in the Ethereum Layer 2 ecosystem, enabling the rapid development of decentralized exchanges, payment, and gaming platforms, among others. The project teams who push the progress, include zkSync, StarkNet and Polygon zkEVM. In a nutshell, a ZK-Rollup is a solution that not only handles the transactions but also keeps them confidential by performing them off-chain while simultaneously using cryptographic techniques to validate their correctness on-chain.

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