Crypto Wallets

Smart Wallets and Passkeys: The Guide to Account Abstraction (ERC-4337)

Advanced blockchain, Crypto Wallets, Smart Contracts / Wisdom Uche Ijika

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

Blockchain Basics, Crypto Wallets, Security & Best Practices / Wisdom Uche Ijika

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

Crypto Wallets, DeFi & Staking, Smart Contracts / Wisdom Uche Ijika

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)

Crypto Wallets, Security & Best Practices / Wisdom Uche Ijika

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

Crypto Wallets, Security & Best Practices / Wisdom Uche Ijika

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 &

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Contract Risks (for Users): Re-entrancy, Upgrades, Admin Keys

Security & Best Practices, Crypto Wallets / Wisdom Uche Ijika

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: Phishing, Drainers, Fake Airdrops

Security & Best Practices, Crypto Wallets / Wisdom Uche Ijika

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, oracle-manipulation

Smart Contracts, Blockchain Basics, Crypto Wallets, Security & Best Practices / Wisdom Uche Ijika

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

Crypto Wallets / Wisdom Uche Ijika

Intro to Multi-Sig & Smart Wallets (Account Abstraction, Guardians, Paymasters) Intermediate Wallets • ~20 min read • Updated: 11/07/2025 TL;DR: Plain EOAs (Externally Owned Accounts) are one private key away from disaster. Multi-sig wallets require a threshold (e.g., 2-of-3) to move funds, removing the single-key failure mode. Smart wallets (contract accounts) go further: social recovery

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Wallet Safety 101

Crypto Wallets / Wisdom Uche Ijika

Wallet Safety 101 (2025): Seed Phrases, Hardware Wallets, Approvals & Scam Defense Beginner → Intermediate Self-Custody & Security • ~16–20 min read • Updated: 2025-11-07 TL;DR: Self-custody is powerful but unforgiving. Your crypto is secured by private keys derived from a seed phrase, lose the seed or sign something malicious and funds can move without

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