Security & Best Practices

Stay protected in Web3 with essential blockchain security tips. Learn how to avoid phishing scams, protect private keys, detect rug pulls, and follow best practices for using wallets, dApps, and DeFi protocols safely.

Multi-sig Wallets (Safe/Gnosis) and MPC Overview

DeFi & Staking, Nodes, L1/L2, Rollups, Security & Best Practices, Smart Contracts /

Multi-sig Wallets and MPC: Shared Control, Fewer Single Points of Failure Set m-of-n approvals for treasury moves, upgrade rights, or personal vault safety. Compare on-chain multisig and MPC, design pragmatic policies, and avoid common operational mistakes. TL;DR: A multisig is a smart-contract account that executes only after m-of-n owner approvals; policy is transparent and enforceable […]

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Decentralized ID (DID) and Verifiable Credentials (VCs)

Smart Contracts, Security & Best Practices /

Decentralized Identifiers (DID) and Verifiable Credentials User controlled identifiers plus portable, signed claims. How DIDs resolve, how credentials are issued and verified, and how these building blocks fit with wallets, apps, security, and compliance. Quick navigation: Introduction • DIDs: formats and methods • Verifiable credentials: model and formats • Issuance flows (wallet and server) •

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Using Hardware Wallets (Setup, Passphrase, Best Practices)

Crypto Wallets, Security & Best Practices /

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

Security & Best Practices, Crypto Wallets /

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 /

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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Auditing and Testing (Foundry/Hardhat, fuzzing, static analysis)

DeFi & Staking, Security & Best Practices, Smart Contracts /

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, oracle-manipulation

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

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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On-chain Privacy: Mixers, Stealth Addresses, and Compliance

Security & Best Practices /

On-chain Privacy: Mixers, Stealth Addresses, and Compliance Intermediate Security • ~9 min read • Updated: 08/08/2025 Public blockchains are transparent by default: account balances, transfers, and contract interactions can be traced forever. That’s great for auditability but bad for personal and business confidentiality. This comprehensive guide walks through practical privacy techniques. how they actually work

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