I know they don't currently do this, but if GPS satellites cryptographically signed their timing signals, could that potentially be usable to establish that, in

I know they don't currently do this, but if GPS satellites cryptographically signed their timing signals, could that potentially be usable to establish that, in addition to the particular camera capturing the images at a particular time, that it also did so in a particular-ish place ? It's possible to record and replay signals from gps satellites with different delays, so maybe that could be used to spoof the location, but if the camera also has an internal clock, perhaps it could detect if there was too much discrepancy there? But I don't know how much that could constrain the location. Also gps only has limited precision, especially indoors? Uh, maybe using cell towers instead of, or in addition to, gps would be better? Hm.