21 days · ~15 minutes a day · free
Learn Bitcoin in 21 days
One short lesson and one real task each day. By day 21 you can explain Bitcoin, hold your own keys safely, send a Lightning payment, spot scams — and teach the next person.
Week 1
Foundations — why Bitcoin exists
Day 1 · 1.1What is money?Money is a technology — and technologies get upgraded.Day 2 · 1.2The fiat systemInflation isn't weather. It's policy.Day 3 · 1.3, 1.42008, the genesis block & the whitepaperThe first block contains a newspaper headline about bank bailouts. On purpose.Day 4 · 2.1The ledger & the double-spend problemA ledger everyone holds is a ledger no one can forge.Day 5 · 2.2Mining & proof of workMining is a lottery you enter with electricity — and that's exactly why it's secure.Day 6 · 2.3Nodes & verificationA $200 computer can audit the entire money supply. Yours can.Day 7 · 2.6Monetary policy in code + Quiz 1You know exactly how many bitcoin will exist in 2140. Nobody knows how many dollars will exist next year.
Week 2
Hands-on — keys, custody, Lightning & the asset
Day 8 · 2.4Keys, addresses & ownershipOwning bitcoin means knowing a secret.Day 9 · 3.2Seed phrases & the restore drillTwelve words can carry your savings across a border in your head.Day 10 · 3.3Threat models & staying safeMost bitcoin isn't hacked. It's handed over.Day 11 · 2.5Transactions, fees & the mempoolBitcoin doesn't have balances. It has digital cash and change.Day 12 · 4.2Lightning: receive your first satsThe payment settles before a card machine would finish dialing.Day 13 · 4.2Lightning: send + Quiz 2Now complete the loop — be the sender.Day 14 · 5.1, 5.2, 5.5The asset: scenarios, ETFs & volatilityA price target is a scenario, not a promise.
Week 3
Economy, civics & capstone
Day 15 · 6.1–6.2Circular economies: proof of moneyThese aren't pilots. People get paid, buy groceries, and save — in bitcoin.Day 16 · 4.3, 6.4Merchants, the map & your local loop + Quiz 3Accepting bitcoin tonight, with zero volatility risk, is a settings screen — not a leap of faith.Day 17 · 7.1Rules of the road: tax & regulationProperty for taxes, money for people — know the difference.Day 18 · 7.3–7.4Cities, states & honest civicsThree states have reserve-related laws. One has a bitcoin-backed bond. This is no longer hypothetical.Day 19 · 8.4, 2.7, 8.1Earning sats, open source & BIPsYour first earned sats teach you more than your first bought ones.Day 20 · CapstoneCapstone — teach one, plan your next 90 daysYou don't fully know it until someone else knows it because of you.Day 21 · FinalFinal assessment & your certificateVerified, not trusted — including you.
The certificate
Verified on Bitcoin, not by us
Pass the day-21 final and claim your $21 certificate. Its fingerprint is timestamped on the Bitcoin blockchain with OpenTimestamps, so anyone can verify it forever — even if this website disappears.
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