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Each peer could create its own (incompatible with existing ones) currency in the system.
When the free currency it is created by tasks or by other means, they have to be consensually agreed by members backing that. The doing of those tasks (and so the posibility of getting this newly created currency) should be preferently for the one with the more negative balances in the most used currencies while having the less capacities and-or be auctioned or pseudorandomized.
The Free currency should define its expiry deadline.