Updated 28 June 2024
<aside>
<img src="/icons/star_lightgray.svg" alt="/icons/star_lightgray.svg" width="40px" /> NEW: Contract verification on the ZKcandy Block Explorer is now working. Please update your hardhat.config.js
file with the new one from this tutorial and Configure Your Environment with the new updated commands.
</aside>
There are multiple ways to deploy contracts to the ZKcandy Testnet. For this tutorial, we will be using @matterlabs/hardhat-zksync-deploy
- part of the ZKsync plugin set for the Hardhat development environment.
This plugin provides utilities for deploying smart contracts on ZKsync Era and by extension, ZKcandy with artifacts built by the @matterlabs/hardhat-zksync-solc
or @matterlabs/hardhat-zksync-vyper
plugins.
<aside> <img src="/icons/book_lightgray.svg" alt="/icons/book_lightgray.svg" width="40px" /> This documentation is written with reference the the official zkSync Hardhat Plugin documentation.
</aside>
As this is a long document that covers setting up a development environment and subsequently the deployment of a contract to the ZKcandy Sepolia Testnet, this list will help you navigate through the steps
yarn
zksync-cli
to prepare your development environment<aside>
<img src="/icons/warning_lightgray.svg" alt="/icons/warning_lightgray.svg" width="40px" /> This method of deployment requires the use of your wallet private key in your project’s environment variables. For testing, do not use a wallet with mainnet funds on any blockchain, not just ZKcandy or ZKsync Era. For the purposes of this document, this secret will be stored in a .env
file. It is imperative that this file is never committed to any version control system.
</aside>
To test your contract with a local node, refer to this page in the zkSync CLI Documentation on how to start a local node. zksync-cli
will create both an Ethereum and ZKsync node on your machine. As ZKcandy is on parity with ZKsync Era, you should test your contracts on the local ZKsync node.
To initialise your deployment environment, install zksync-cli
to prepare your environment with Hardhat.
yarn add zksync-cli
Replace the projectFolder
in the command below with the name you wish to use for your project folder. You can also replace hardhat_solidity
with hardhat_vyper
if you are deploying a contract written in Vyper.
yarn zksync-cli create projectFolder --template hardhat_solidity
You will be prompted to enter your wallet private key after entering the command. If you don’t have this available now, press Enter to proceed with installing the environment first. You can enter your wallet private key into the project environment variables later.
You may also be prompted to select your package manager for Node. For the purposes of this document we will be using yarn
.
This command will install hardhat
and other dependencies, including the relevant contract compilers into your project folder.
From this point onwards, you will be operating from your project folder. Switch into your folder using the following command, once again replacing projectFolder
with the name of your project folder.
cd projectFolder
<aside> <img src="/icons/star_lightgray.svg" alt="/icons/star_lightgray.svg" width="40px" />
NEW: If you had tried the following steps prior to 28 June 2024, please use the new commands and hardhat.config.ts
file below so that your contract can get verified on the ZKcandy Block Explorer
</aside>
Add the hardhat-zksync-deploy
plugin to your project using the following command:
yarn add -D @matterlabs/hardhat-zksync-deploy @nomiclabs/hardhat-ethers ethers zksync-ethers
After adding the plugin, you will find a hardhat.config.ts
file in the root of your project folder. Edit this file to add the ZKcandy Sepolia Testnet RPC as follows. You may also paste its contents and overwrite your existing hardhat.config.ts
import { HardhatUserConfig } from "hardhat/config";
import "@matterlabs/hardhat-zksync-deploy";
import "@matterlabs/hardhat-zksync-solc";
import "@matterlabs/hardhat-zksync-verify";
import "@nomiclabs/hardhat-ethers";
// Define the zkSync networks
const ZKcandySepolia = {
url: "<https://sepolia.rpc.zkcandy.io>",
ethNetwork: "sepolia",
zksync: true,
verifyURL:
"<https://sepolia.contract-verifier.zkcandy.io/contract_verification>",
};
const ZKsyncTestnetSepolia = {
url: "<https://sepolia.era.zksync.dev>",
ethNetwork: "sepolia",
zksync: true,
verifyURL: "<https://explorer.sepolia.era.zksync.dev/contract_verification>",
};
const ZKsyncTestnetGoerli = {
url: "<https://testnet.era.zksync.dev>",
ethNetwork: "goerli",
zksync: true,
verifyURL:
"<https://zksync2-testnet-explorer.zksync.dev/contract_verification>",
};
const ZKsyncMainnet = {
url: "<https://mainnet.era.zksync.io>",
ethNetwork: "mainnet",
zksync: true,
verifyURL: "<https://zksync2-mainnet-explorer.zksync.io/contract_verification>",
};
const config: HardhatUserConfig = {
zksolc: {
version: "1.4.1",
// version: "latest",
compilerSource: "binary",
settings: {
optimizer: {
enabled: true,
mode: "z",
},
},
},
defaultNetwork: "ZKcandySepolia",
networks: {
hardhat: {
zksync: false,
},
zkCandySepolia: zkCandySepolia,
zkcandysepolia2: zkcandysepolia2,
zkSyncTestnetSepolia: zkSyncTestnetSepolia,
zkSyncTestnetGoerli: zkSyncTestnetGoerli,
zkSyncMainnet: zkSyncMainnet,
},
solidity: {
version: "0.8.24",
},
};
export default config;
zkCandySepoliaTestnet
is a label for the ZKcandy Sepolia Testnet. You can select this as the default network using the defaultNetwork
property.url
is a field containing the URL of the ZKcandy Sepolia Testnet public node in case of the ZKcandy Testnet (with zksync
flag set to true
), or the URL of the Ethereum node. This field is required for all ZKsync-type and Ethereum networks used by this plugin.zksync
is a flag that indicates if the network is using the ZK Stack (e.g. ZKsync Era, ZKcandy). This field needs to be set to true
for ZKcandy as it is false
by default.Load your contract into your environment by copying it to the contracts
folder in the root of your project folder.
You will find some example contracts inside the contracts
folder. You can safely delete these files and/or folders if you do not wish to use them.
Run the following command to compile your contract for ZKcandy:
yarn hardhat compile
If successful, your contract bytecode should now be available in the in the artifacts-zk
folder in the root of your project folder.
Navigate to the deploy
folder in the root of your project folder. Here you will find a deploy.ts
file. For complete documentation on how to use this file, please refer to the official documentation from ZKsync. For the purposes of this document, your deploy.ts should look like this:
import { deployContract } from "./utils";
export default async function () {
const contractArtifactName = "MyContract";
await deployContract(contractArtifactName);
}
Replace the values of contractArtifactName
with the name of the contract you compiled (this is not necessarily the contract filename).
If your contract has a constructor, declare a constructorArguments
variable with your contract’s constructor arguments in array format as its value, then add the constructorArguments
variable as a parameter to the deployContract
function.
import { deployContract } from "./utils";
export default async function () {
const contractArtifactName = "MyContract";
const constructorArguments = ["Argument1", "Argument2"];
await deployContract(contractArtifactName, constructorArguments);
}
You are now ready to deploy your contract using the wallet whose private key is in your project’s .env file.
If you did not input your wallet private key during the setup or if you wish to change your wallet key, open the .env
file in the root of your project folder and enter your private key as the value of the WALLET_PRIVATE_KEY
variable.
Run the following command to initiate the deployment process:
<aside> ⚠️ This command will deploy your contract.
There is no confirmation prompt after executing this command. You cannot undo this step once your contract is deployed. Please make sure you have completed all desired unit testing and that the constructor arguments in your deploy.ts
script are correct before proceeding.
</aside>
yarn hardhat deploy-zksync --script deploy.ts
Your machine will now attempt to deploy the contract to the ZKcandy Sepolia Testnet. If successful, the program will return the contract address of your newly deployed contract.
<aside> 📝 Make a note of your contract address in the terminal printout.
As our block explorer is still undergoing some improvements to better verify deployed contracts, please copy the contract address from the terminal printout if your contract deployment is successful so that you are able to access and interact with it in the future.
</aside>
The deploy script will also attempt to upload verify your contract source code on the ZKcandy Sepolia Testnet block explorer.
<aside> 🔧 Contract verification is currently experimental on the ZKcandy Sepolia Testnet.
If your contract verification fails to verify from the CLI, follow this link to perform manual verification.
</aside>
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