They&#x27;ve had this in Sweden for like 10 years. It&#x27;s all pretty clunky, even though you can now use an app instead. You generally have to have your card, then some plug-in, then the host have to implement the whole thing. Usually signing things isn&#x27;t the whole story either, so you still have to deal with e.g. payments.<p>The Estonian system is probably better, since it&#x27;s newer, but the challenge isn&#x27;t really in handing out cards. It&#x27;s standardizing authentication on the Internet and connecting that to whatever else matters.