Deploy a Smart contract
Last updated
Last updated
To deploy a smart contract on LaChain, a custom blockchain network, using Hardhat, an Ethereum development environment. This section will cover setting up Hardhat, creating a simple smart contract, compiling the contract, testing the contract, and deploying the contract on LaChain.
Create an npm project and install Hardhat:
To create a simple smart contract for deployment on LaChain, start by creating a Hardhat project by using:
This will show you a prompt where you can select your favorite language projects based on your needs. Choose 1 project and go through these steps to compile, test and deploy the sample contract.
In the contracts folder, you'll find Lock.sol, which is a sample contract that consists of a simple digital lock. With this contract, users can only withdraw funds after a set period of time. Feel free to add, modify, or update the contracts according to your needs.
To configure Hardhat for LaChain, update the hardhat.config.js file with the LaChain network credentials and create a .env file to store sensitive information like private keys and API keys.
To compile the smart contract, first install the Hardhat Toolbox with the command:
and then run the command:
To test the smart contract, run the command:
This will execute the tests in the test directory of your Hardhat project.
To deploy the smart contract on LaChain, execute the deployment script with the command:
Replacing <lachain> with the name of the LaChain network you configured in the hardhat.config.js file. After the deployment, you can verify the deployment status on LaChain's block explorer if it's available.
To interact with the deployed smart contract on LaChain, you can use provided tools such as Remix, Truffle or you can create custom scripts using Hardhat and Ethers.js to interact with the contract programmatically. This allows you to read data from the contract, send transactions, and perform other operations as needed.
npm install --save-dev hardhat
npx hardhat
require('dotenv').config();
require("@nomiclabs/hardhat-ethers"); require("@nomiclabs/hardhat-etherscan");
module.exports = {
defaultNetwork: "lachain",
networks: {
hardhat: { },
lachain: {
url: "
https://rpc1.mainnet.lachain.network
",
accounts: [process.env.PRIVATE_KEY]
}
},
solidity: {
version: "0.8.9",
settings: {
optimizer: {
enabled: true,
runs: 200
}
}
},
}
npm install --save-dev @nomicfoundation/hardhat-toolbox
npx hardhat compile
npx hardhat test
npx hardhat run scripts/deploy.js --network <lachain>