The crypto stamp consists of two parts. While it is a physical stamp worth CHF8.90, every crypto stamp also has a related digital image. This digital image shows one of 13 possible designs, is stored in a blockchain and can be collected, exchanged and traded online.
“At first glance, the Swiss Crypto Stamp looks like any ordinary stamp. It is self-adhesive, shows the Matterhorn and the moon on a blue background, and has a face value of CHF8.90,” it said, pointing out that owners can use it to frank postal items just like any other stamp.
https://www.swissinfo.ch/eng/swiss-post-to-launch-switzerland-s-first-crypto-stamp/46991360