A relatively simple and practical storage fee (state rent) model

The broken incentive system of Ethereum state storage (no cost for leaving your junk around forever) has been an active topic for years but AFAIK every proposal so far has turned out to be very complicated/risky/high overhead after careful examination. Here is my latest attempt, please feel free to punch holes in it :slight_smile:

(the pricing model might be interesting independently from the data structure solution, I believe it has good stability properties)

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