Understand crypto wallets, seed phrases, passkeys, and the difference between hot, cold, and smart wallets. Stay safe and in control of your digital assets.
Smart Wallets With Passkeys: A Practical ERC-4337 Setup Guide (Security, Fees, Recovery) Passwords are brittle, seed phrases are terrifying for mainstream users, and “gas first, app later” killed more on-ramps than we admit. Passkeys (WebAuthn/FIDO2) and ERC-4337 smart accounts finally fix this. In this guide you’ll set up a passkey-first smart wallet, understand fees and […]
Smart Wallets & Passkeys: The 2025 Guide to Account Abstraction (ERC-4337) Passwords are dying, seed phrases have scared mainstream users for a decade, and wallet UX is finally catching up. In 2025, passkeys (WebAuthn/FIDO2) are going default on major platforms, while account abstraction (ERC-4337 smart accounts) turns wallets into programmable apps that can do gas
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How to Keep Your Seed Phrase Safe: A Complete Guide Your seed phrase (recovery phrase) is the master key to your crypto. Anyone who gets it can move your funds; if you lose it, nobody, not an exchange, not wallet support, not the blockchain can restore it. This guide gives you a practical, battle-tested process
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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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Using Hardware Wallets: Setup, Passphrase & Best Practices Lock down your keys the right way, from first unbox to recovery rehearsal. TL;DR: Buy from official channels, initialize on-device, record the seed offline, consider a passphrase, verify addresses on-screen, and test a recovery before storing real value. In this lesson Unbox & supply-chain safety On-device setup
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Wallet Safety 101: Daily Habits that Prevent Most Losses Seed phrases, approvals, blind signing, device hygiene, and sane wallet architecture. TL;DR: Keep a vault on a hardware wallet and a small-balance daily wallet. Never type seed phrases on websites. Review/revoke approvals. Avoid blind signing. Use bookmarks and simulate transactions. In this lesson Seed phrases &
Contract Risks (for Users): Re-entrancy, Upgrades, Admin Keys How to evaluate a DeFi/NFT protocol before you trust it with funds. TL;DR: Check audits, bug bounties, upgradeability, admin roles, and oracle design. Prefer protocols with timelocks, multisig governance, and public risk docs. In this lesson Re-entrancy (what to watch as a user) Upgradeable contracts & proxies
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Common Attacks in Web3: Phishing, Drainers, Fake Airdrops How the most successful crypto scams actually work, and exactly how to avoid them. TL;DR: Most losses start with social engineering (DMs, emails, pop-ups). Drainers abuse token approvals or get you to sign malicious messages. Never enter a seed phrase outside your hardware wallet. Use an approval
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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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Intro to Multi-Sig & Smart Wallets Intermediate Wallets • ~12–14 min read • Updated: 08/08/2025 TL;DR: A plain EOA (Externally Owned Account) is one private key away from disaster. Multi-sig wallets require a threshold of approvals (e.g., 2-of-3) before funds move, eliminating single-key failure. Smart wallets (contract accounts) go further with programmable rules: spending limits,
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