"OTP failed to fetch time/counter" on airgapped Jade

[mamolas]

When login to Jade Classic with QR PIN or SeedQR it fails to view stored OTPs it says "OTP failed to fetch time/counter" except when connected with Green over Bluetooth.

Is there a workaround preferably over QR to tell Jade the current timestamp so OTP can work 100% offline without relying on a companion app?
Running latest firmware 1.0.33

[JamieDriver]

It's a fair point - how to communicate an initial 'current time' to an airgapped jade so TOTP can work.

There is a (bespoke) QR that Jade will accept to set the time - we just need something to create and display it.
Maybe this is something the jade website could do, @bitcoinhelp ?

[jgriffiths]

Perhaps a UX screen prompting the user to set the time when required? A QR would need to be scanned within 30s which might not be possible for some users...

[JamieDriver]

I guess I was thinking a page with a qr which updated every ~5-10s ... but yes, it may be equally easy to just have a simple time entry screen on Jade (either utc only, or with a tz offset).

[mamolas]

both options would fit best, manual input for users having issues scanning fast enough or to read a dynamic QR timestamp for a better UX, Jade could run a timer since the last timestamp update so it can generate several TOPTs in the same session until logout

[JamieDriver]

Oh yes, once the time is set (after power-up/boot) jade then keeps time internally - it just does not have a clock that is running when powered-off, so needs to be told at every power-on or unlock.
At the moment the companion apps tell Jade the current utc time when they initially connect, and jade keeps track of it internally from then - so yes, you'd only have to scan/enter the time once per "power-session", and you should be able to generate as many OTPs as you require all the time jade is not powered-down.

[mamolas]

There is a (bespoke) QR that Jade will accept to set the time - we just need something to create and display it. Maybe this is something the jade website could do, @bitcoinhelp ?

While it gets implemented, if it happens to be considered, can you provide an example of the string with Unix epoch time that Jade will understand as a set time instruction? I can input it at any FOSS QR generator and scan it.
To store the most sensitive OTPs in a 100% offline blind device like Jade is a strong layer of security