My version of this model would have the lowest possible barrier to usage such that you don't need to register or authenticate initially at all. Let the user pro

My version of this model would have the lowest possible barrier to usage such that you don't need to register or authenticate initially at all. Let the user provide some kind of identifying token, say an email address or Facebook ID token, and a pledge amount. Tie it to whatever client data is offered (e.g ip address or cookie). At some later date authentication and collection takes place. A database in a cloud somewhere tracks all these pledges, their IDs, and when and if they get authenticated and paid. The exact mechanism is left as an exercise to the entrepreneur. The key would be complete revocability. This would be necessary due to the ease with which imposters could, for example, put your email address in a form or spoof an ip address. But I think it also provides interesting data about those who pledged, authenticated, and reneged. It could be tracked as a new form is currency itself. It might also provide interesting data about the origins of scams and spam on the internet.