Brilliant idea, but why the crypto? Couldn't you simply do the collar + web connection... without crypto?
e.g. if you go to suburban Japan and you walk by someone on the street who asks you for help and needs to call someone, you may lend them your phone. If the same thing were to happen in SF, you shouldn't. And so, perhaps, if you were a good guy you go ask a Japanese tourist haha! Okay, well the analogy is a little stretched but hopefully you get something out of it.
I must confess I'm enamored with the concept of blockchains, but find their value questionable for the most part.
I even worked for a blockchain startup (non-crypto) but left on less than good terms and a fair amount of PTSD. They were nuts!
A local farmer could perhaps figure out how to contact a swiss banker all on their own, but it would be a lot easier, and cheaper, if there were single place (or better yet, a few competing places) that offer a central place that anyone looking to use/supply credit could come together.