In a lot of European countries there is a system to legally sign documents with a digital signature. Either via SMS/App TAN - like for online banking - or a sma

In a lot of European countries there is a system to legally sign documents with a digital signature. Either via SMS/App TAN - like for online banking - or a smart card/HSM (mostly used by corporations). I think Austria moved even more services to the digital age then Estonia. It is not fancy, nor modern. But a lot of documents primarily exist only in a digital form (all laws, court files, official documents, financial administration documents, ...). They are often printed out, but they are just a random piece of paper, just a "copy" of the original. The official and valid version is the digitally signed PDF. It is mostly implemented via some really boring and antiquated Java Server Pages HTML forms, that are not always easy to use. But they work nearly all the time, and once you send them you immediately get a signed and legally binding confirmation that it was filed. The roots of the system go back to the early 2000s, and used elliptical cryptography right from the start. Which was really hard back then to deal with, because most libraries or applications didn't support it yet. For example native Windows support came only with Windows 7. In Austria everyone and every company that has E-mail is required to accept digital signatures. If you cancel your phone contract with a signed PDF via E-Mail the company can't refuse to accept it, as every court will instantly decide in your favour.