Everyone should read Inventing Bitcoin by #[0]

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A Bitcoin fork does not affect the 21 million supply limit of Bitcoin itself. Imagine you have the world’s gold stored in the ultra securely engineered Fort Knox under heavy armed guard. You build a small, poorly engineered shack and call it Fort Knox Lite, securing it with a single guard. You paint some rocks a gold color and put them in the shack. You then announce to the world that you’ve “forked gold” and issued every holder of gold an equivalent amount of free rocks inside your shack.