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I had a look at your idea and I must say that I'm impressed with it as it does give MOIN a use case and also can be used as added security on websites. We haven't heard from KingCaper in a while so hopefully we get an update from him soon and get his opinion on this idea as I'm all for it.
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Thanks, I think as the idea develops it could be refined, but the core concept it good. From a coin supply perspective, current supply is 9 million, so assuming it got mass adoption, we would likely have to ensure there was enough going around to maintain usability. I am also, unsure if the coins sent for Authentication should be burned or sent to a central wallet for MOIN development. We can work out the details later though.

Beyond this, there are some key things I'd love from a MOIN project wish list. Effectively, a real privacy based eco-system.

 - Mobile wallet storage
 - Mobile encrypted chat (in-wallet private / group chat)
 - The ability to sync a mobile and desktop wallet / chat
 - Two-factor authentication (as described in image)
 - Multi-factor authentication (similar to 2FA but requires 51% (2+ more people) of specified addresses to approve access
 - Cold staking
 - Hardware wallet storage

And my personal favourite:
 - BBS (bulletin Board System) managed / stored on the blockchain