Ask HN: How do it explain Bitcoin to my dad?

It depends a lot on why he wants to know, what he wants to do, and how much detail he's looking for.

Look, I did a search for you:

Since I have an irrational hatred of Reddit[0] I then followed it up with this:

This seems to be the best explanation.

Here's another with a different slant:

Hope that helps. Will you return and tell us how you got on?

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[0] It's irrational - don't try to understand it or convince me otherwise.

"It's like Paypal"