Learning paths
Guided journeys
Each path walks through a few models in a sensible order, with one thing to try in each and an optional question to check your understanding. Your progress stays in this browser only.
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For everyone, no experience needed
First steps
From one payment to the whole chain: what really happens when someone sends bitcoin.
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For anyone who holds bitcoin, or will
Keeping bitcoin safe
What a wallet really holds, why the recovery phrase is everything, and how to stay safe.
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For curious learners ready for mechanics
How the network agrees
Nodes, miners, difficulty and block space: how thousands of strangers agree on one history.
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For anyone interested in money and history
Money and time
How new bitcoin is issued, how that compares with other monetary systems, and how Bitcoin got here.
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For developers and engineers
Under the hood
The numbers behind the machines: vsize, fee rates, retargets, descriptors and attack probabilities.
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For anyone curious about fast, small payments
Lightning
How payment channels let two people pay each other many times with only two blockchain transactions when the channel is closed cooperatively.
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For anyone who wants to see the maths that secures Bitcoin
Cryptography
Hashes, keys and signatures: the three tools behind every block and every payment.
