If you just google search custom tamperproof hologram stickers, a handful of companies that produce them will come up.
A couple companies to check are Novavision, Mavericklabel, and Intertronix though there are plenty of others. Most of the ones I've found require a minimum order of 1000 though.
So Salty, can you take me through the process of making these cold wallets with the diy holograms?
Thank you so much for your help!