SIGHASH Flags
How do SIGHASH flags let one transaction commit to 'all outputs', 'no outputs', or 'whoever pays this' — and why is the flag byte itself tamper-proof?
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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.