Block Zero.
Bitcoin from first principles — interactive tools, long-form lessons, and a quiz to find out where you actually stand.
Tools
Interactive primitives. Hash a file, mine a block, generate a key.
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UTXO Visualizer
Paste a txid — or pick a famous one — and walk the chain forward and backward by clicking inputs and outputs. Live data from mempool.space.
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Lessons
Long-form arguments with charts, history, and primary sources.
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A Brief History
Forty years from cypherpunk mailing lists to a trillion-dollar network. The events, the artifacts, the people — chronological, no hagiography.
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Quiz
Gauntlet, daily five, two 30-question deep dives, plus topic drills. All with leaderboards.
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The 15-Question Gauntlet
Five easy, six medium, four hard. Drawn from a pool of 120. Daily and topic modes also live at /quiz/daily and /quiz/topics. Submit to the leaderboard.
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