I had this idea a few months back but didn't have any reason to develop it, I assume many others have done too and I would love to see it used. The basic use ca

I had this idea a few months back but didn't have any reason to develop it, I assume many others have done too and I would love to see it used. The basic use case for me was when I had an application that had a purpose when used mobile vs desktop (for me it was scanning labels of products) and a user had to be logged in via the desktop and phone. Glad to see a proof of concept, I hope this idea takes off, typing in my username and password on mobile devices drives me crazy. Sign in on website, have a QR code, scan with phone and be logged in to the website on the phone. edit: nevermind, this is a different, more like finger print scanners than my idea. That teaches me to skim articles at first. Still a neat idea!