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RTCs are actually quite rare, especially in a lot of the lower power RF SoCs.

Drift would also be an issue - most move at least 10 minutes a year. That's with good temperatures, not being left in a hot car or at body temp.

If you could solve the drift issue then it would be pretty good I think, it's an interesting idea.

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Maybe you could use the secure connection to resync the time or some other clock with the authenticated server. I guess that’s just another request / response type of arrangement though. And then any breakdown of communication for an extended period of time would brick the whole thing.

EDIT: Maybe the time based one time password algorithm can be configured to be made less time granular (say daily) so that it can handle clock drift.

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