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I think the closest we have to this at the moment is Apple Pay -- and I presume Samsung/Google pay work the same way -- where the card number for a given transaction is changed every X number transactions.

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So I haven't looked into Apple Pay and the specifics on how it works. What really strikes me as being gamechanger is the ability to sign legal contracts from your own laptop. I've never come across anything like this in the US, where I can accept a loan agreement or something similar from the comfort of my own home.

Maybe this is a business idea to think of for the future.

Upon further research, I see that the BankID is provided in two different forms. It seems there is a universal key which can be used to log into most websites, while there's also a private key which will be tied to one specific site. Here's another website with some more info on it:

https://www.xn--billigeforbruksln-orb.no

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