We want to place the code inside the cap mostly for two reasons:
1. We can make sure the code cannot be claimed by someone else but the person drinking the beer
2. Well the bottle cap kind of looks like a coin so we figured it would be the perfect place for it
![Wink](https://bitcointalk.org/Smileys/default/wink.gif)
(and after Trump is done with nuking us back into a Fallout scenario we can increase the worth of single cap further
![Grin](https://bitcointalk.org/Smileys/default/grin.gif)
)