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TLDR;
Me want to sign in into application
Me give my username
Me no more give my password or private key
Application welcome me and me feel safe
Thank you HiveAuthentication Services!

Now this is an awesome service! TLDR and all provided hahahahaha.
it sounds like it could make a lot of new user life easier.

It already makes mine way easier than before. Me teasing 😇

Can you give me a bit more 'for dummies' info? I can do the above with Hive Keychain. But does your system allow any authenticating wallet to interact with the app requesting authentication? So it would work for people who use Keychain and also for those that don't want to use it, but use the HiveWallet or Vessel? Basically the app you are wanting to log in to is key storage agnostic?

does your system allow any authenticating wallet to interact with the app requesting authentication?

Absolutely

it would work for people who use Keychain and also for those that don't want to use it, but use the HiveWallet or Vessel?

Exactly. You can even use multiple authenticators (Keychain and HiveWallet for example) and still use Keychain extension when on desktop

the app you are wanting to log in to is key storage agnostic?

Yes, it just knows how to talk to the HAS server and has no idea how the authentication request was approved