wonder if that would harm a private key printed on regular paper. I use Revla paper (thanks to DaveF) and I am sure that would not be affected by this method. makes me question any second hand coin now...
Would it matter what happens to the paper? Once the hologram is off you can always reprint it.
I mentioned it to someone else in a PM but:
Certain issues have been well known for 9 years
https://www.coindesk.com/markets/2013/08/13/defcon-hackers-crack-physical-bitcoin-casascius-coins/
Supposedly they (Casascius) fixed their holograms.
But with everyone else we have to hope they bought their holograms from a quality maker and not just the lowest cost one.
-Dave
