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Deploy and Verify Smart Contracts Using Remix IDE

Remix Online IDE is a powerful toolset for developing, deploying, debugging, and testing Ethereum and EVM-compatible smart contracts.

This tutorial will cover how to use the Remix Sourcify plugin to verify deployed smart contracts on the Telos Explorer on mainnet.

It is important to verify smart contracts for a wide number of reasons in an open network environement like Telos EVM, ultimately to build transparency, trust, and security within your developer and user community. It is advised to verify any smart contracts that are deployed onto the Telos network

If you run into issues don't hesitate to reach out in our community channels for help or questions.

High Level Overview

With Remix verification, it is required to compile the contracts in order to use the sourcify plug in. The meta data must also be exact same as deployment time
  • Set up Smart Contraact file in the contracts folder
  • Compile the smart contract to byte code to be consumed by Telos EVM
  • Connect Metamask Wallet using Injected provider
  • Deploy Smart Contract
  • Verify it using the sourcify plug in.

Simple isn't it, well lets go ahead and get to it!!

Set up Smart Contract

For this example, we will compile, deploy, and verify this ERC20 contract from Open Zeppelin. Open up Remix and paste the code below into a new file in the contracts folder. Name it whatever you want. In this case we named it My_Epic_ERC.sol.

// contracts/GLDToken.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "@openzeppelin/contracts/token/ERC20/ERC20.sol";

contract GLDToken is ERC20 {
    constructor(uint256 initialSupply) ERC20("Gold", "GLD") {
        _mint(msg.sender, initialSupply);
    }
}

Connect Metamask and Compile the contract

Connect Metamask

As an environment select Injected Provider - Metamask Click on Ethereum Deploy Logo on the side

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Then MetaMask will pop up, Click Next & allow the wallet to connect to Remix

Compile

Simply command+s works

OR

Run the compiler tab. Make sure to always make sure the compiler is >= pragma solidity declaration

In this case we used 0.8.7 in compiler and declared a pragma ^0.8.0

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Deploy Smart Contract

  • Click on the contract you have created called GLD Token that inherits the ERC20 standards
  • Under Deploy, insert initial supply that will be passed to the constructor
  • Transact by confirming in Metamask pop up.
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Copy Contract Address

Get the Contract Address we just deployed in the Deploy Tab

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Get the Sourcify Plugin

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Use the Sourcify Plugin to Verify the Contract

  • Compile contracts in Remix, before attempting verification
  • The metadata must be exactly the same as at deployment time
  • Navigate to Sourcify Tab
  • Select Verifier
  • Since we just deployed using remix it already has contract metadata and sources.
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Select Verify

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We just verified a ERC20 contract using the Remix IDE - Sourcify plug in.

Head over to Hardhat Sourcify for an automated method of verifying multiple smart contracts within a larger project dev environement, simutaneously with just one command!