I discovered a very interesting patented technology that is very much in line with the goal of having a physical form of bitcoin that is readily exchangeable without Internet access:

https://mandrillapp.com/track/click/30895797/www.offline.cash?p=eyJzIjoiUVdWcTV1dUtmVnBXLWtYY1daVlRHcHhJOHY0IiwidiI6MSwicCI6IntcInVcIjozMDg5NTc5NyxcInZcIjoxLFwidXJsXCI6XCJodHRwczpcXFwvXFxcL3d3dy5vZmZsaW5lLmNhc2hcXFwvI2J1eT91c2VyQ29kZT13d2psa2pzXCIsXCJpZFwiOlwiMDM5OWE1NzY2NzQ3NDFhNGJiZGVmNWFiOTNiYzYzODNcIixcInVybF9pZHNcIjpbXCJmNGFkOTM5YjBiMjE1OTQzZDUyMWNmNjU3Nzk5ZWYzYzQwYjY0Njg3XCJdfSJ9

If you can find any bug in this note, let me know. I will be investigating it in detail. It looks like a lot of thought has been put into this technology.