The holograms are very tamper evident. They reveal a honey comb pattern if peeled. The adhesive is pretty strong, I have to use transfer tape to get them on the coins because they will show honeycombs if the sticky side even gets grazed by a finger.
Cool, I like it. This would be good info for marketing campaign. Also a little instruction guide how to spot a peeled sticker (like with a little comparison pic or something).
trading a 1:1 value
OP says: 1.25 BTC per coin for up to 10 coins and better rate for more coins.. Not 1:1 though.