Hands-on practice files from learning blockchain, crypto and web3 step by step.
Live site: https://jsklabs-works.github.io/web3-lab/
| File | What it is |
|---|---|
| practice-ethereum.html | A pretend Ethereum in the browser: send ETH, watch blocks form, read transaction details. No wallet needed. |
| token-dashboard.html | Connects to MetaMask and reads/sends an ERC-20 token on the Sepolia test network (ethers.js). |
| mini-blockchain.js | A tiny blockchain in one file: hashing, blocks, signatures, mining and tamper detection. Run with node mini-blockchain.js. |
| MyToken.sol | A minimal ERC-20 token written from scratch with line-by-line comments, for Remix. |
Everything here uses test networks or pretend money. Never share a seed phrase or private key.