Yes. You leave it plugged in at home and it stores your notes on behalf of any clients you're using on devices.
It's actually very exciting and a first of its kind. The whole world will have to use public key crypto it some point and keys will prob use something like this for things like social media.
Unless you want to use authenticator every time you post
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But couldn’t the mobile app just keep it ?
I don’t get the point of this hardware things
Then if your mobile or app is compromised so is your key.