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Doesn't it kind of already exists for passports? I can travel with my passport to (basically) any country on earth, so there must be some international support for this.

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The format of the data on a passport is unified (https://en.wikipedia.org/wiki/Machine-readable_passport) but the problem is to make sure that the one who presents this string of data is actually the one it belongs to.

Good for you, but, for example, Israeli passports are not recognised by many countries as legitimate.

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