Very little. The two biggest bitcoin holders I know personally (aside from myself ofcourse), actually know very little about bitcoin. And they know a lot more than the average person.
That being said. Average person knows little about fiat as well or most things they interact with daily. How many people do you know that can explain how their car works of how electricity works or how a computer computes? Most people are not curious and are perfectly happy remaining ignorant. They have the capability to learn anything but won't unless they absolutely need to.
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