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Yeah, I think something like that would work.
Also option to consider is to show the number of sats received in a small box, like the number of emails here
The box could have yellow background. (I'm not sure if that's the right way, just an option to consider)
Changing the look of the notification depending on the sats stacked is interesting. It seems like people want to be able to distinguish, at a glance, sat stacking notifications from replies.
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