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Next bitcoin "having" is happening in 2020... that is probably the reason...

I don't know much about cryptocurrencies, but with bitcoin the general trend is upward with a lot of fluctuation. So the value of it could drop and come back up in 2018 and 2019, with a net increase in value by 2020. But I agree with you that 2020 is kind of an arbitrary year to put, might as well be any other year.

It might be arbitrary.

Or people are expecting something for the year 2020.

Or I'm not sure when it happens, but it will have happened until 2020.

So what is it that while have happened until then?