365 Q&A #10: Unusual Currency

Today's writing prompt is right up my alley. This one allowed me to tap into an idea I've had for a story for quite sometime.

Open yourself up to all geographies and time periods and imagine a society with an unusual currency - it is not paper, gold or bitcoin. What is it, and where does it come from?

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Blood is currency. The rich take it from the poor in order to keep themselves young. O- types are hunted for their blood and delve deep below the city's surface into hiding. In this world their blood is like gold. They are the universal donor. Unfortunately their Achilles heel is that they can only receive their blood type back. With their numbers dwindling, will they survive or become extinct?

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What do you think our future currency will look like?