Blockchain Development: Understanding Web3

What is Blockchain?

A distributed ledger technology that maintains a continuously growing list of records (blocks).

Key Concepts

Smart Contracts

solidity
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

contract SimpleStorage {
    uint256 storedData;

    function set(uint256 x) public {
        storedData = x;
    }

    function get() public view returns (uint256) {
        return storedData;
    }
}

Web3.js Integration

javascript
import Web3 from 'web3';

const web3 = new Web3('https://mainnet.infura.io/v3/YOUR-PROJECT-ID');

async function getBalance(address) {
  const balance = await web3.eth.getBalance(address);
  return web3.utils.fromWei(balance, 'ether');
}

Development Tools

• Hardhat: Ethereum development environment
• Remix IDE: Browser-based IDE
• Metamask: Web3 wallet

Getting Started

1. 1Learn Solidity basics
2. 2Understand gas optimization
3. 3Test thoroughly
4. 4Audit before mainnet

Conclusion

Blockchain development is evolving rapidly. Start with simple smart contracts and learn by doing.