What is this supposed to mean? It sounds a bit like carving IOUs in stone but that is probably not what you were hinting at.
I would consider Rai Stones as a good analagy, given they also stored suffering in a trustworthy way: https://en.wikipedia.org/wiki/Rai_stones.
When I say "suffering" I'm referring to the amount of causality associated with a given amount of value stored, not the human emotion attached to it.
Mind you, there are a few downsides too - potential to create transactional race conditions if you control enough of the system; difficulty changing into other currencies; architectural decisions yet to be ironed out about how to scale to a mass audience.
Lack of ability to reverse a transaction could also be seen as a negative in certain lights -- no "visa, cancel this charge, they scammed me".