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But there has been changes to the way bitcoin works, and even forks because of it, eg bitcoin cash.

Now, irrelevant of what you think of those, the community can, and has changed the way Bitcoin works.

And, as such, it can also change what math it uses, if it so wishes. So the math ultimately depends on the community.

You get to decide what fork you run.

Yes, but if nobody else values the output of your particular fork, it hardly matters.

The community ultimately chooses which fork you run if you want to actually participate in a monetary system. Really, that's all this argument is -- any currency exists within a monetary system that is willed into existence by its participants, and no amount of maths will ever change that. It's not like gold had much use for the majority of its history, and yet it became the dominant currency.

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