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Alex Gluchowski authored and Alex Gluchowski committed Dec 2, 2019
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# ZK Sync: scaling and privacy engine for Ethereum

Check out [ZK Sync live demo](https://demo.matter-labs.io/).

ZK Sync is a scaling and privacy engine for Ethereum. Its current functionality scope includes low gas transfers of ETH and ERC20 tokens in the Ethereum network. This document is a description of the JS library that can be used to interact with ZK Sync.

ZK Sync is built on ZK Rollup architecture. ZK Rollup is an L2 scaling solution in which all funds are held by a smart contract on the mainchain, while computation and storage are performed off-chain. For every Rollup block, a state transition zero-knowledge proof (SNARK) is generated and verified by the mainchain contract. This SNARK includes the proof of the validity of every single transaction in the Rollup block. Additionally, the public data update for every block is published over the mainchain network in the cheap calldata.
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