The Registry implements a form of Demurrage through the design of Transient and Transient Exchange - it isn't based on time, but on the amount of wealth accumulated.  The cost for a purchaser to give one more Transient Exchange to a seller is one more than the current amount of Transient Exchange owned by the seller, which destroys the currency in the system for each Transient purchased.

Currency is also destroyed democratically through the implementation of Reserves.