> For the complete documentation index, see [llms.txt](https://help.zke.com/symbol/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.zke.com/symbol/zk-zksync.md).

# ZK(zkSync)

* Issue Time

  \--
* Total Supply

  21,000,000,000 ZK
* Circulation

  3,675,000,000 ZK
* White paper

  <https://docs.zksync.io/dev/>
* Website

  <https://zksync.io/>
* X Twitter

  <https://twitter.com/zksync>
* Telegram

  <https://t.me/zksync>
* Block Explorer

  <https://explorer.zksync.io/address/0x5A7d6b2F92C77FAD6CCaBd7EE0624E64907Eaf3E>

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, atomic swaps & limit orders as well as native L2 NFT support. 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.

{% hint style="info" %}
Trade on ZKE Exchange：<https://www.zke.com/&#x20>;

Twitter：<https://twitter.com/ZKE\\_com&#x20>;

Telegram：<https://t.me/ZKEGlobal>

Support: <https://support.zke.com>
{% endhint %}