Search⌘ K
Home
Courses
Developing Play-to-Earn Games in Solidity

Smart Contract Deployment

Explore the essential process of deploying Solidity smart contracts using Remix and MetaMask on the Sepolia Ethereum testnet. This lesson guides you through compiling contracts, deploying to a safe test environment, interacting with deployed contracts, and verifying your code on Etherscan to ensure transparency and security.

We'll cover the following...

The simplest way to deploy a Solidity contract is to use Remix. Once we deploy our contracts, we will verify their source code on Etherscan. We'll need to have the MetaMask extension installed in our Chrome browser for this lesson.

We're going to deploy the bankFactory.sol contracts to the "Sepolia test network” of Ethereum. This contract requires basicBank.sol to be saved in the same folder so that it can import it.

Solidity
// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0 <0.9.0;
import "./basicBank.sol";
contract bankFactory {
basicBank[] public branches; 
function createNewBranch() public {
     basicBank branch = new basicBank();
     branches.push(branch);
   }
function getTotalBalance() public view returns (uint){
     uint totalBalance;
     for (uint i=0;i<branches.length;i++){
     totalBalance+=basicBank(branches[i]).balance(msg.sender);
   }
   return totalBalance;
}
}

A testnet works the same way as the Ethereum main network, but it doesn't cost any real ETH and allows us to test our contracts safely. Once we are absolutely satisfied with them, we can deploy to the mainnet, which costs real ETH and has real-life consequences.

Compilation

First, we'll go to the “FILE EXPLORER” of Remix and create our two files: basicBank.sol and bankFactory.sol

The "FILE EXPLORER" panel
The "FILE EXPLORER" panel

To compile each source file, we'll select the file, go to the “SOLIDITY COMPILER,” make sure to select an appropriate compiler version for our files (any version between 0.6.0 and 0.9.0), and then click on “Compile fileName.sol.” A shortcut for this process from the ...