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

// Specifies that the source code is for a version
// of Solidity greater than 0.4.0
pragma solidity ^0.4.0;

// A contract is a collection of functions and data (its state)
// that resides at a specific address on the Ethereum blockchain.
contract HelloIgnite {

    // The keyword "public" makes variables accessible from outside a contract
    // and creates a function that other contracts or SDKs can call to access the value
    string public message;

    // A special function only run during the creation of the contract
    constructor(string memory initMessage) public {
        // Takes a string value and stores the value in the memory data storage area,
        // setting `message` to that value
        message = initMessage;
    }

    // A publicly accessible function that takes a string as a parameter
    // and updates `message`
    function update(string memory newMessage) public {
        message = newMessage;
    }
}

The first line, pragma solidity ^0.5.10 specifies that the source code is for a Solidity version greater than 0.5.10. Pragmas are common instructions for compilers about how to treat the source code (e.g., pragma once).

A contract in the sense of Solidity is a collection of code (its functions) and data (its state) that resides at a specific address on the Ethereum blockchain. The line string public message declares a public state variable called message of type string. You can think of it as a single slot in a database that you can query and alter by calling functions of the code that manages the database. The keyword public automatically generates a function that allows you to access the current value of the state variable from outside of the contract. Without this keyword, other contracts have no way to access the variable.

The constructor is a special function run during the creation of the contract and cannot be called afterward. In this case, it takes a string value initMessage, stores the value in the memory data storage area, and sets message to that value.

The string public message function is another public function that is similar to the constructor, taking a string as a parameter, and updating the message variable.

Compile Smart Contract#

Go to Solidity Compiler.
Select Compiler Version to 0.5.10.
Now, Compile HelloIgnite.sol

Now, We have to deploy our smart contract on Ignite 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 - “Ignite Testnet”
In URL field you can add the URL as "https://test1igniterpc.com "
Enter the Chain ID: 8898

(Optional Fields) Symbol: "IGT" and Block Explorer URL: "https://test.ignitescan.com/"
Go ahead and click save
Copy your address from Metamask

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

Now, let's Deploy the Smart Contract on Ignite 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://test.ignitescan.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 Ignitescan

Navigate to your contract's Ignitescan 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.

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Last updated 1 year ago