contract-deployment-tutorial.mdx

section	developers
date	Last Modified
title	Contract Deployment Tutorial
lang	en
permalink	developers/guides/contract-deployment-tutorial
excerpt	The Scroll Sepolia Testnet allows the community to deploy smart contracts on Scroll. In this tutorial, we will teach you how to deploy a contract on Scroll Sepolia.
whatsnext	Scroll Messenger Cross-chain Interaction /en/developers/guides/scroll-messenger-cross-chain-interaction/

import Aside from "../../../../../components/Aside.astro"

The Scroll Sepolia Testnet allows anyone to deploy a smart contract on Scroll. In this tutorial, you will learn how to deploy a contract on Scroll Sepolia using common tools for developing on Ethereum. This demo repo illustrates contract deployment with Hardhat and Foundry.

Before you start deploying the contract, you need to request test tokens from a Sepolia faucet and use the [bridge](https://scroll.io/bridge) to transfer some test ETH from _Sepolia_ to _Scroll Sepolia_. Alternatively, you could acquire Scroll Sepolia ETH directly. See our [Faucet](/user-guide/faucet/) and [Bridge](/user-guide/bridge/) guides for help.

Deploy contracts with Hardhat

1. If you haven't already, install nodejs and yarn.

2. Clone the repo and install dependencies:

   git clone https://github.com/scroll-tech/scroll-guides.git
   cd scroll-guides/contract-deploy-demo
   yarn install

3. Create a .env file following the example .env.example in the root directory. Change PRIVATE_KEY to your own account private key in the .env.

4. Run yarn compile to compile the contract.

5. Run yarn deploy:scrollTestnet to deploy the contract on the Scroll Sepolia Testnet.

6. Run yarn test for hardhat tests.

Deploy contracts with Foundry

1. Clone the repo:

   git clone https://github.com/scroll-tech/scroll-guides.git
   cd scroll-guides/contract-deploy-demo

2. Install Foundry:

   curl -L https://foundry.paradigm.xyz | bash
   foundryup

3. Run forge build to build the project.

4. Deploy your contract with Foundry:

   forge create --rpc-url https://sepolia-rpc.scroll.io/ \
     --value <lock_amount> \
     --constructor-args <unlock_time> \
     --private-key <your_private_key> \
     contracts/Lock.sol:Lock

   • <lock_amount> is the amount of test ETH to be locked in the contract. Try setting this to some small amount, like 0.0000001ether.
   • <unlock_time> is the Unix timestamp after which the funds locked in the contract will become available for withdrawal. Try setting this to some Unix timestamp in the future, like 1696118400 (this Unix timestamp corresponds to October 1, 2023).

   For example:

   forge create --rpc-url https://sepolia-rpc.scroll.io/ \
     --value 0.00000000002ether \
     --constructor-args 1696118400 \
     --private-key 0xabc123abc123abc123abc123abc123abc123abc123abc123abc123abc123abc1 \
     contracts/Lock.sol:Lock

Questions and Feedback

Thank you for participating in and developing on the Scroll Sepolia Testnet! If you encounter any issues, join our Discord and ask us in the #testnet-devs channel.