I think there have been similar things in practice for a while. The real difference here is just the open blockchain to simplify accounting. Even though there a

I think there have been similar things in practice for a while. The real difference here is just the open blockchain to simplify accounting. Even though there are probably lots of little details that are different, this seems really similar to things like XDRs: https://en.m.wikipedia.org/wiki/Special_drawing_rights https://en.m.wikipedia.org/wiki/Special_drawing_rights