The old saying "a verbal agreement isn't worth the paper it's written on" could be tweaked for modern times as "an online agreement isn't worth the paper it's written on"

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The social security number can really be retired altogether. There already exists a form of national identity card in the US, and it's called the passport card. It contains all the information found on a passport except the visa pages, contained in the form of a smart card. It already has RFID capabilities. The only thing is that passport cards are not universal, but they can be if they are made free and the Government phases out social security numbers for passport card numbers in all contexts.