This occurred to us too. At what point does Bitcoin become big enough that "joining it" is a net win for a country? Like sure, the country loses its ability to control its own currency and rates, but for many their currency isn't that great already OR they are part of the EU and as such, they already no longer have control.

Perhaps EU members will some of the first countries to adopt a full Bitcoin standard as it'd mean they go from being interoperable with many other EU countries, to being interoperable with ALL countries.

Of course, there are other benefits of the EU, but a country could also be both an EU member and declare Bitcoin as legal tender.

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