Thanks @dantheman, this would be an really interesting way of utilizing the blockchain.
So thanks for point that out, you got my vote on this one !
btw. we from Einstein Potsdam had our first Steem $ transaction !
https://steemit.com/steemit/@einsteinpotsdam/hello-steemit-this-is-einstein-kaffee-bistro-potsdam-we-are-officially-on-steemit-com