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Creating a Basic Smart Contract on Ethereum Blockchain

If you are intrigued by blockchain technology and want to dip your toes into this pool, then creating a simple Smart Contract on the Ethereum blockchain could be a great start. A Smart Contract is a self-executing contract stored on a blockchain that contains the terms of the agreement between parties. Ready? Let’s dive in!

Step 1: Install Necessary Tools

Firstly, you need to install Node.js and NPM (Node Package Manager). Next, install Truffle, a popular Ethereum development framework. Use the following command in your terminal:

`npm install -g truffle`

Step 2: Create a Truffle Project

Navigate to the directory where you want your project to live and run:

`truffle init`

Step 3: Create Your Smart Contract

Create a new file in the ‘contracts’ directory:

`touch contracts/HelloWorld.sol`

Your contract structure starts with a pragma line, indicating the version of the Solidity compiler needed. Add the following to your HelloWorld.sol file:

`pragma solidity ^0.5.16;

contract HelloWorld {
function sayHello() public pure returns (string memory){
return ‘Hello, World!’;

Step 4: Compile Your Smart Contract

To ensure your contract is written correctly with no syntax errors, compile it:

`truffle compile`

If everything is okay, you will see a new ‘build’ directory.

Step 5: Run Your Smart Contract on a Local Blockchain

Install Ganache, a personal blockchain for Ethereum development you can use to deploy contracts and make calls. Download it from their official website and run it. After Ganache starts, use:

`truffle migrate –reset`

Your Hello World contract is now on a blockchain!

Step 6: Interacting with the Smart Contract

To do this, you need a truffle console:

`truffle console`

Then, create an instance of your contract:

`HelloWorld.deployed().then(function(instance){ app = instance })`

Now, call your sayHello function:


You should see your ‘Hello, World!’ message. You’ve successfully created and interacted with your first Ethereum Smart Contract!

So, whether you’re looking into blockchain as a hobby or contemplating it as a career move, having a solid foundational understanding of how Ethereum’s Smart Contract works is vital. Armed with the knowledge you now have, the world of blockchain technology offers limitless possibilities for exploration!

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