Learn by doing
Learn it by doing it. No real money.
Reading about seed phrases is a start. Losing a test wallet on purpose, and getting it back, is what makes it stick.
No account needed. Progress stays in your browser. Nothing here asks about your money.
Photo: Jean-Baptiste D. (Unsplash License)
01 · Sandbox wallet
The complete experience of self-custody, with worthless coins
The sandbox runs on signet, a Bitcoin test network. Its coins cannot be bought or sold and have no value, so every mistake is free.
- Time needed
- About 25 minutes
- You practise
- Backing up, restoring, sending and reading a fee
- Progress
- No account needed, stays in your browser
- Create a walletA fresh test wallet in this browser
- Back up the wordsTwelve words on paper, then checked
- Receive test coinsFrom the sandbox faucet
- Delete the walletOn purpose
- Restore itFrom the words alone
- Send a transactionAnd read the fee
Create a practice wallet
The browser creates 12 random words. The words are the wallet: whoever has them controls the coins.
Signet test coins: worthless
Open the sandbox wallet02 · Seed phrase drill
Can you read your own backup back?
A backup that was never checked is a hope, not a backup. The drill trains the habit with practice words made in your browser.
- Time needed
- About 10 minutes
- You practise
- Writing, ordering and verifying words
- Progress
- No account needed, stays in your browser
- Check 1In orderRead the backup back, word by word, at positions the drill picks.
- Check 2Find the wrong wordOne word on a copy was written down wrongly. Spot it.
- Check 3Why a typo is caughtHow the last word carries a check, and what it cannot catch.
03 · “What happens if” scenarios
One event, six forms of money
Each scenario shows what happens to cash, a bank deposit, the digital euro as specified, an e-money stablecoin and Bitcoin on-chain and on Lightning. It does not say which to choose.
- Time needed
- About 10 minutes per scenario
- You practise
- Counterparty, custody and freeze risk
- Progress
- No account needed, stays in your browser
No scenarios yet
Learning by doing, with nothing to lose: a safe place to make the mistake that costs real money elsewhere.
Why the learning tools exist
04 · Myth check
Half-truths from every camp, in one fixed format
Claim, data, assessment. Crypto myths are checked as strictly as myths about cash, gold and banks, so the format never turns into advertising for one side.
- Time needed
- About 4 minutes each
- You practise
- Separating a claim from its evidence
- Progress
- No account needed, stays in your browser
- Claim
- The claim as it circulates, and who usually makes it.
- Data
- The figures and facts that bear on it, each with its source.
- Assessment
- What holds, what does not, and what would change the view.
Published myth checks
No myth checks yet
05 · Knowledge self-test
Questions about concepts, never about your money
The result is a learning path that starts where your answers stopped. It never names an asset or a product.
- Time needed
- About 8 minutes
- You practise
- Keys, custody, inflation, stablecoins
- Progress
- No account needed, stays in your browser
- Answer each question about how money, banks and crypto work. None asks about your own money.
- Your browser scores the answers. Nothing is sent to us.
- The result is the learning path that covers what you missed most.
What the result looks like
A suggested learning path, based only on these concept questions, with free pages in a sensible order.
How we know
