I would say it is the lighting.
This is the best I could do showing the extrusion on the hologram:
https://imgur.com/a/vQUD36qI have tried (although admittedly with very little effort) to know more about the coins and as the previous commenter mentioned, I have already tried posting and asking in r/cosmosnetwork and in the telegram. No luck until now.
That video is perfect.. you can clearly see the "bump" from the key paper underneath