Pay-to-Script-Hash (P2SH)
How does a 20-byte hash let an arbitrarily complex multisig hide behind a normal-looking address that starts with '3' — and who pays the storage cost?
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Feynman technique
Learn with the Feynman Technique
Explain each idea in your own words in handwriting, then upload a photo for AI critique. Two attempts per question — there's no "right" answer, only depth of understanding.