4. Deploying the contract
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This guide walks you through deploying your Confidential ERC20 smart contract on the Sepolia test network.
Before proceeding, ensure you have:
A configured Hardhat project using the fhEVM Hardhat Template (see previous sections).
A crypto wallet installed (e.g., Metamask).
Some Sepolia ETH available for testing. If you don’t have enough ETH, use a Sepolia faucet to request free SepoliaETH for testing:
Generate a mnemonic seed for accounts using cast:
(cast is a Foundry function. If you don't have Foundry installed, run curl -L https://foundry.paradigm.xyz | bash first):
Obtain a Sepolia RPC URL:
Sign up for a node provider such as Alchemy - https://www.alchemy.com/ or Infura - https://infura.io/. Copy your Sepolia RPC URL.
Open the .env file:
Past your mnemonic in the code:
MNEMONIC=<Your mnemonic generated>
Paste a Sepolia RPC URL:
SEPOLIA_RPC_URL=<Your node provider URL>
Verify generated accounts:
Open your wallet (e.g, MetaMask)
Import the first 2 accounts (e.g., Alice and Bob) into your wallet with their private keys.
Fund these 2 accounts with some Sepolia ETH.
In the deploy/ directory, there is a preconfigured deploy.ts file that handles the deployment process. You can customize it or add your own scripts.
To deploy the contracts to Sepolia, run:
Once deployment is successful, you should see a console output that includes the contract address such as:
Congratulations! 🎉 You have deployed your first confidential ERC20 smart contract. Let's mint a few tokens and perform some encrypted transactions!
You can verify this contract on by searching for the deployed address.