Using Remix

Hello World style starter project. Deploys a smart contract with a message, and renders it in the front-end. You can change the message using the interact panel!

This dapp implements a "Hello World" style application that echoes a message passed to the contract to the front end. This tutorial is intended to be followed using the online IDE available at Remix IDE.

Setting up Remix IDE

• Remix IDE is an online IDE to develop smart contracts.

• If you’re new to Remix, You’ll first need to activate two modules: Solidity Compiler and Deploy & Run Transactions.

• Search for 'Solidity Compiler' and 'Deploy & Run Transactions' plugins in the plugin tab in Remix.

• Activate the two plugins

• Select Solidity Environment

• Go to File Explorers, and Create a new file , Name it HelloIgnite.sol

• Copy/Paste the Smart contract below into the newly created file HelloIgnite.sol

The smart contract

Copy

Explainpragma solidity ^0.8.10
contract helloWorld { 

  string public hello = "Hello World!"
}

The first line, pragma solidity ^0.8.10 specifies that the source code is for a Solidity version greater than 0.8.10. Pragmas are common instructions for compilers about how to treat the source code (e.g., pragma once).

Compile Smart Contract

• Go to Solidity Compiler.

• Select Compiler Version to 0.8.10.

• Now, Compile HelloCtex.sol

Now, We have to deploy our smart contract on CTEX Chain network. For that, we have to connect to web3 world, this can be done by using Metamask.

Please follow this tutorial to setup a Metamask Account.

• Open Metamask and select Add Network from the networks dropdown.

• Put in a Network name - “CTEX Testnet”

• In URL field you can add the URL as https://testnet-rpc.ctexscan.com

• Enter the Chain ID: 72152

• (Optional Fields) Symbol: "CTEX" and Block Explorer URL: "https://testnet-rpc.ctexscan.com"

• Go ahead and click save

• Copy your address from Metamask

Head over to CTEX Faucet and request test CTEX - you will need this pay for gas on CTEX Chain.

Now, let's Deploy the Smart Contract on CTEX Chain:

• Select Injected Web3 in the Environment dropdown and your contract

• Accept the Connection Request!

• Once Metamask is connected to Remix, the ‘Deploy’ transaction would generate another Metamask popup that requires transaction confirmation.

Congratulations! You have successfully deployed HelloIgnite Smart Contract. Now you can interact with the Smart Contract.

Check the deployment status here: .https://testnet-rpc.ctexscan.com

Verifying your Contracts on IgniteScan

The first and foremost step is to flatten the solidity contract into a single file.

Flatten your solidity contract

• Install truffle-flattener or sol-merger

• Flatten using command

sol-merger \"./contracts/*.sol\" ./build

Verifying Contract on CTEXscan

• Navigate to your contract's https://testnet-rpc.ctexscan.com page and then click verify and publish

• Select Solidity (Single File) in compiler type

• Select appropriate compiler version

• Choose the license type of your contract

Onto the next section, paste your flattened contract here.

If you had enabled optimization then adjust the optimization section accordingly.

Constructor arguments should have been filled in automatically, if not, they can be retrieved from the trailing bytes of the deployment transaction, they resemble something like 0000000000000000076172d1a6fa476172d1fb5f76172d178d61b04b0ecd319c

If you have followed the process successfully, the contract would be verified.