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[![Live on Mainnet](https://img.shields.io/badge/wallet-Live%20on%20Mainnet-blue)](https://wallet.zksync.io)
[![Live on Rinkeby](https://img.shields.io/badge/wallet-Live%20on%20Rinkeby-blue)](https://rinkeby.zksync.io)
[![Live on Ropsten](https://img.shields.io/badge/wallet-Live%20on%20Ropsten-blue)](https://ropsten.zksync.io)

zkSync 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.

## Description

zkSync 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.

This architecture provides the following guarantees:

- The Rollup validator(s) can never corrupt the state or steal funds (unlike Sidechains).
- Users can always retrieve the funds from the Rollup even if validator(s) stop cooperating because the data is
available (unlike Plasma).
[![
- Thanks to validity proofs, neither users nor a single other trusted party needs to be online to monitor Rollup blocks
in order to prevent fraud.

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