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I just tried it out on https://beta.peakd.com and my mind is blowing!

Though it seems that if I close the app on my phone, I have to re-open it whenever I try an action that needs a different key.

Altogether though this is very interesting.

There is a beta on my dev website too https://hivean.com/.
Yes, there are some drawbacks as you have noticed. On Android you can apparently send the app to the background and it still works. iOS is a different story.

I'm logged in right now on beta.engage.hivechain.app and my phone is on the table next to me open and working perfectly.

There's a lot of user explaining needed but this is really heading in a good direction for all of us.