If you're doing productive work then you're already producing something of value, and can likely sell more easily and safely using the existing financial system

If you're doing productive work then you're already producing something of value, and can likely sell more easily and safely using the existing financial system. It would have to be some sort of productive work that is not otherwise valued due to limitations in our economic system, perhaps climate change related actions as explored in Ministry for the Future. Still seems like it would just be easier to pay people normally to do that work.