Hello,
I'm comparing your NitroKey to Yubikey2 HW, where I'd like to prefer your solution, mainly for it's OSS both HW & SW, and that it's made in Germany.
I missing feature I find is that yubikey has a HW button that needs to be pressed to confirm action each time the donge is to be used. Why is this missing in NitroKey? Would you plan to implement it in future generations?