Through the technological expertise of Advast Suisse, a quality seal was crafted for KELLER that merges security with aesthetic elegance. The holographic Nanocrypt® technology used incorporates cutting-edge security features that... read more →
The term "paper wallet" or "smart banknote" refers to a physical note that resembles a conventional banknote both visually and physically, but is used in contrast as a wallet for... read more →