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
- 1Learn Solidity basics
- 2Understand gas optimization
- 3Test thoroughly
- 4Audit before mainnet
Conclusion
Blockchain development is evolving rapidly. Start with simple smart contracts and learn by doing.