Ok, but one of the most important use cases is non-local access.

If I’m at home I can just go to the door.

Go on, drop a rocket on Zuck’s Bond villain hideout.

Let’s see what happens.

https://economy-finance.ec.europa.eu/euro/eu-countries-and-euro/sweden-and-euro_en

One of the criteria is to deliberately peg your currency to the Euro for two years. This is optional and you can simply never do it.

So Sweden will not join the Euro without a referendum, even though they don’t have an opt out.

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