Module 1
What bitcoin is — and why it matters
Money as a ledger, why a ledger without a boss is useful, what it costs, and what changes on the bitcoin-blake2b network.
Level: none · 12 min
Open module 1Free course · no sign-up · no jargon
Bitcoin, explained from zero
Six short modules: what bitcoin is, how it actually works, how to keep it safe, what privacy means here, how Lightning fits in, and a screen-by-screen tour of this wallet. Written for someone who has never used a wallet before.
≈ 15 minutes per module · English only (use your browser's translator for other languages)
The curriculum
Read in order the first time: each module uses words defined in the previous ones.
Module 2
How it works
Keys, addresses, transactions, UTXOs, fees, confirmations and mining — the machinery, with analogies instead of equations.
Level: none · 18 min
Open module 2Module 3
Keys, backups and security
Self-custody, the recovery phrase, passwords and biometrics, the scams that actually happen, and what to do in each emergency.
Level: essential · 15 min
Open module 3Module 4
Privacy
What the public ledger reveals, why address reuse is the real problem, and exactly which data this app sends to whom.
Level: intermediate · 10 min
Open module 4Module 5
Lightning and swaps
Instant payments inside channels: capacity, inbound liquidity, force closes, routing fees, and swaps with a provider.
Level: intermediate · 15 min
Open module 5Module 6
The app, screen by screen
A guided tour: first ten minutes, sending, receiving, addresses, coin control, watch-only, Lightning, settings — plus troubleshooting and a glossary.
Level: practical · 20 min
Open module 6How to read it
Read, don't skim
Each module ends with a takeaway box: if you cannot restate it in your own words, reread the module.
Practise with small amounts
Do the exercises with the smallest amount you can send. Every mistake in this course is cheap to make; mistakes later are not.
Keep module 3 close
The security module is the only one worth rereading once a year. Everything else can be looked up when needed.
In a hurry? Five answers
Do I need to buy anything to take this course?
No. The course is free and open source, and the app has no accounts, no paid tiers and no token. You only need funds if you want to practise sending.
Is this a Bitcoin wallet?
It is a wallet for bitcoin-blake2b, a separate experimental network that shares Bitcoin's design but has its own rules and its own coins. Read module 1 → the network before handling real funds.
Can the author of the app recover my funds?
No, by design. The keys are generated and encrypted on your device. Your recovery phrase is the only backup — see module 3.
What does the app send to the internet?
Only the queries needed to read the chain (and to broadcast a transaction), to one public API, optionally with community mirrors. Module 4 lists them one by one and shows how to turn the mirrors off.
Is the course available in other languages?
The course is written in English only, on purpose: it is the canonical text and stays current. Use your browser's built-in translation (Chrome, Edge, Firefox and Safari all offer it) for any language.
When you are ready
Module 6 ends with a checklist for your first wallet. Take the app with you:
Download the app