lots of issues with getting miners to accept that one as a softfork.
Rather the opposite: I think miners are the ones most likely to push this, a it provides them with a reliable income stream. And it can be implemented gradually, in a way that is compatible with existing wallets.
I think you'll find much less resistance with this method at the very least. I think tail emissions is too controversial. Probably best to drop the push for tail emissions and make this your primary push.
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On my todo list is to write up a proper description of demmurage and how I think it could be added to bitcoin.
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