double-life fee
posted on 3 Dec 2019Double-life fee is a simple model for state rent.
If the chain started at time t0, then an new object (a UTXO or whatever it may be) which is confirmed at time t0 + t expires and can be garbage collected at time t0 + 2*t.
When an object becomes eligible for garbage collection, that means it has existed for more than half the age of the chain.