Owning Bitcoin is one thing; holding it safely is another. This course turns you from someone who leaves coins on an exchange into someone who truly controls their own money. You'll learn what a wallet really is, how seed phrases work, the difference between hot and cold storage, and exactly how to set up and back up your first self-custody wallet — without losing access. This is the most important skill in Bitcoin.
📚 Lessons
Open each lesson, take the quick check, then mark it complete to earn XP.
Custodial vs self-custody: "not your keys, not your coins"
When you buy Bitcoin on an exchange and leave it there, the exchange holds the keys, not you. You have an IOU. That's custodial. It's convenient, but you're trusting a company — and companies can be hacked, freeze withdrawals, or collapse (remember FTX in 2022, where millions lost funds).
Self-custody means you hold the private keys in your own wallet. No one can freeze or seize it. The flip side: you are fully responsible — there's no "forgot password" button.
When custodial is OK: small amounts you're actively trading. When to self-custody: any meaningful savings you intend to hold. A common rule: keep on an exchange only what you'd be comfortable losing.
Seed phrases explained
When you create a self-custody wallet, it generates a seed phrase (also called a recovery phrase): usually 12 or 24 random words, like "ridge, ocean, lunar, …".
Those words ARE your money. From them, your wallet derives every private key. Anyone who has them can take your Bitcoin; if you lose them and lose your device, your Bitcoin is gone forever.
- Write them on paper (or stamp into metal) in order. Never type them into a website.
- Never photograph them, store them in cloud notes/email, or type them into a phone keyboard you're unsure about.
- No legitimate person, app, or "support agent" will ever ask for your seed phrase. Anyone who does is a scammer. 100% of the time.
Hot wallets vs cold wallets
Self-custody wallets come in two flavours, and most people use both:
- Hot wallet — software on your phone or computer, always connected to the internet (e.g. a mobile Bitcoin wallet). Great for spending and small amounts; convenient but more exposed to malware.
- Cold wallet — a hardware wallet: a small offline device that signs transactions without exposing your keys to the internet. Best for savings you want to keep safe for years.
The bigger your savings, the more it's worth moving them to cold storage. Think of the hot wallet as your pocket cash and the cold wallet as your vault.
Setting up your first wallet (step by step)
Here's the safe path to your first self-custody wallet:
- Choose a reputable open-source wallet. Look for well-reviewed, widely used Bitcoin wallets. Download only from the official site or official app store listing.
- Create a new wallet and let it generate your seed phrase. Do this in a private place.
- Write the words down on paper, in order. Double-check spelling. Do NOT screenshot.
- Confirm the backup when the app asks you to re-enter some words — this proves you saved them.
- Send a tiny test amount first (a few dollars of sats). Confirm it arrives.
- Practice a recovery (optional but powerful): wipe the app, restore from your written words. Now you know your backup works.
Backups & inheritance
The #1 way people lose self-custodied Bitcoin isn't hackers — it's losing their own backup. Protect against that:
- Make it durable. Paper burns and fades. For larger amounts, stamp your seed into a metal backup that survives fire and water.
- Use more than one location. Don't keep your only copy next to your hardware wallet. Geographic separation protects against fire/theft.
- Consider a passphrase or multisig as you advance. Multisig requires multiple keys to spend — no single point of failure. (An intermediate topic; learn it before using it for large sums.)
- Plan for inheritance. If something happened to you, could a trusted family member find and use your backup? Leave clear, secure instructions — Bitcoin lost to silence helps no one.
🎯 Final exam
Score 70% or higher to pass and unlock your shareable certificate.
Put it into practice
You've learned the theory — now take the safe next step with our hand-picked, regulation-aware guides for Asia.