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In Denmark you would have had to provide your CPR (sort of Social Security number) AND then use a single use code to sign-0ff the transaction (you're given a 100 of them at a time on a separate document). The CPR works for everything from medical prescriptions to tax, local authorities, online purchases etc... It makes everything easier IMO but obviously it's a bit Big Brother, while your pharmacist cannot access your tax records and the Treasury your doctor's notes I'd imagine the police (or a hacker) could potentially know absolutely everything about you.
I keep saying this in this thread, but the UK don't understand how much they're setting society back by being, for the most part, against the ID card scheme.
It's not really about my enthusiasm for forcing someone to carry around a piece of plastic, technologically we're way ahead of that now anyways. But giving each citizen a separate number in a central database can be the foundation for a lot of improvements in civil society. Sure, one can imagine ways it could be abused, but as with the case above, the current conventions sure as hell can be abused.