Instead of filling out forms over and over again with my name, address, phone number, etc, I could simply generate a one-time password that I give to the other

Instead of filling out forms over and over again with my name, address, phone number, etc, I could simply generate a one-time password that I give to the other person and they put my email and one-time password on their system, it sends me an email, fetches a JSON with the information that I've authorized access to, and bingo. Of course we could do this today with other technologies, but the point of this is to leverage something that is already ubiquitous. Because of that I think it's a powerful idea.