OKCOIN:BCHUSD3M   Bitcoin Cash / Dollar Forward 3 Months
It's just a very simply version.
Color even not very correct. I didn't write the price expand or other condition.
It's welcome if other guys want to write a full version.

If this kind chart is not from western.
Then I think it's qianlong platform's indicator. (QianLong means Money Dragon)
If you know the origin of tower line pelease comment to tell me. :3
Apr 24
Comment: From the last 2 and 3 bars.
You can see the blue color is not aligned.
The aligned is better.
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