Is there even any currency that meets that definition? Iirc even bitcoin had some kind of reversal back in the day, or am I misremembering? I seem to recall bit

Is there even any currency that meets that definition? Iirc even bitcoin had some kind of reversal back in the day, or am I misremembering? I seem to recall bitcoin splitting in 2 for a while as there was some disagreement on whether the reversal should be made or not. Idk, it's been a while and my memory is fuzzy.