[otoburb]

Demurrage[1] money acts in a similar manner to encourage usage of a currency. Freicoin[2] implemented a demurrage fee mechanism of 5% per year, which would have the effect of eventually clearing out burned "dead" tokens, although the transaction history would still need to be stored until the end of time if you ran a full node that long.

[1] https://en.wikipedia.org/wiki/Demurrage_(currency)

[2] http://freico.in/about/

[hyperion2010]

If you have a complete account of the location of every fractional token at time t and a time t + d then we should be able to get rid of all logs for transactions with time < t + d. Is there something that prevents freicoin from doing this?