Author here. I haven't seen SQRL and I'll check it in detail later. It looks like a more complicated thing than what I did and much more work compared to a simple, hackathon-like project.

My project works only on Dropbox and it doesn't require Dropbox to support any other authentication mechanism. It just uses OAuth2 behind the scenes.

I didn't know about SQRL, but from what I understand from the author own post on medium, this authentication idea isn't something that he invented:

https://medium.com/@frontsideair/a-summer-spent-studying-par...