You will find that designing such a system requires distinguishing between humans and computers on a computer network. This is a lot harder than it sounds. Fo

You will find that designing such a system requires distinguishing between humans and computers on a computer network. This is a lot harder than it sounds. For something when there's very little at stake, we use CAPTCHAs. But what if there were a cryptocoin's transactions or governance at stake? It's not impossible but it's very, very difficult and would suffer slow transactions, high fees and probably nonzero trust. The downsides are so great as to not make it worth the effort.