Hold your own keys without becoming your own worst enemy. From your first wallet setup to multisig, scam defense, and inheritance planning — the complete b

Course Information

Course Instructor

The W3D Team Author

Independent research on blockchain decentralization. Scores and methodology are maintained by the W3D Team.

1 · Core Lessons (CC-BY)

Why Self-Custody Matters

“Not your keys, not your coins” is the most repeated sentence in crypto — and the least understood until it’s too late. This lesson makes it concrete: what

Hot vs Cold Wallets: Choosing Your Setup

A hot wallet lives online (phone app, browser extension). A cold wallet lives offline (hardware device, paper). You don’t pick one — you run a *system* wit

Setting Up Your First Wallet

Time to do it for real. This walkthrough takes about 15 minutes and ends with a backed-up wallet holding a tiny test amount. Follow it in order — the seque

Seed Phrase Mastery

Your seed phrase recreates every key in your wallet. Everything else — passwords, apps, devices — is replaceable. The words are not. This lesson is about t

Sending and Receiving Like a Pro

Transfers are permanent, so professionals use a ritual: verify, test, send. This lesson turns that ritual into muscle memory.

How Crypto Scams Actually Work

Scams don’t break cryptography — they break *you*, at the exact moment something valuable is one click away. This lesson dissects the five working scams of

Multisig and Hardware Security

Single-key wallets have a single point of failure: one stolen seed, one $5 wrench, one lost paper. Multisig plus hardware is how that failure mode gets eng

Recovery and Inheritance Planning

Nobody plans to disappear — which is why an estimated millions of Bitcoin are already lost forever. This final lesson makes sure your crypto survives you a