Discover how smart contracts work, the most common token standards, and real-world use cases that power decentralized application
Soulbound Tokens (SBTs): Non-Transferable Credentials for Web3 Identity Degrees, memberships, KYC indicators, and achievements that stick to a wallet. This lesson explains what SBTs are, when they shine, how to design for consent and revocation, and how to pair them with private verifiable credentials for safer real-world uses. Quick navigation: Introduction • Model and motivation […]
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ENS and Web3 Domain Names: Human-Readable Addresses that Travel With You Turn hex addresses into names people remember, route many wallets through one handle, publish an avatar and profile once, and build safer team workflows with subdomains and fuses. This masterclass explains how naming works on chain, why it matters for UX and brand, and
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Auditing & Testing: From Unit Tests to Fuzzing & Invariants Ship with confidence: rigorous tests, automated checks, and structured reviews before mainnet. TL;DR: Use Foundry or Hardhat for unit/integration tests, add fuzzing/invariant tests, run static analysis (Slither), measure coverage, and follow an audit checklist with clear threat models. In this lesson Tooling Stack Foundry Example
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Smart Contract Risks: Re-entrancy, Oracles, Access Control & More Recognize top vulnerability classes and the standard defenses used in production. TL;DR: Most exploits are preventable. Use CEI, ReentrancyGuard, strict access control, safe math by default (>=0.8), and robust oracle design. Test, fuzz, and audit before mainnet. In this lesson Re-entrancy Oracle Manipulation Access Control Math/Overflow
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Real-World DApps: Patterns, Flows & Integration From token swaps to crowdfunding: on-chain contracts + front-end + wallet + indexers. TL;DR: A DApp = Smart contract + Front-end + Wallet + RPC/Indexers. Learn common flows you can implement and test end-to-end. In this lesson DApp Architecture DEX Swap (Uniswap-style) NFT Mint Crowdfunding (escrowed) Multisig & Wallet
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Solidity From Zero: Learn by Building (State, Functions, Events, Security, and a Capstone) A friendly, thorough guide for absolute beginners. We start at “what is a smart contract?” and walk you to intermediate skills: writing, testing, and shipping small but real contracts safely. Heads-up: Educational content, not financial or security advice. Use test networks while
Anatomy of an Ethereum Transaction Intermediate Smart Contracts • ~12 min read • Updated: 08/08/2025 TL;DR: A transaction is a signed message that changes state. Core fields: nonce, gas limit, max fee/priority fee (EIP-1559), to, value, calldata, and signature (v,r,s). The base fee is burned; your tip (priority fee) goes to the block builder/validator. Receipts
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ERC-20 vs ERC-721 vs ERC-1155: Token Standards Beginner Smart Contracts • ~12 min read • Updated: 08/08/2025 TL;DR: ERC-20 = fungible balances (currencies, points). ERC-721 = unique items (NFTs). ERC-1155 = one contract for many IDs that can be fungible or non-fungible, with gas-saving batch ops. Choosing the right standard affects wallet UX, marketplace support,
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