I think these coins are pretty good for give aways. Good job OP!
One question: Is there any risk of the QR code that is put under hologram to rub off accidentally? Has this been tested? Keep in mind I do not have any idea how you are getting them on to the coins as I have no experience/knowledge with that specific type of work.
Edit: One more thing I noticed, how well does the QR code read when printed over the indentation on the back? Have you run into any issues with the translation when being read in?
Hey there smoothie, I missed your questions the first go around. The hologram scratch off has a clear plastic bottom and the qr code is laser printed underneath. So it should be safe with any reasonable amount of pressure. I scratched fairly hard in testing and all worked well. As for reading the QR code, I had no problems at all in testing. That picture of coin #2 on the first post was one of the actual coins tested (not sold obviously). I haven't tried but you can probably read the QR code just from the picture (the key is empty now obviously