This is a curved projection channel created upon a bounding box. The chart is presented over a log price scale. For its creation we use 3 "moving averages" that cover the center, upper and lower boundaries for potential movement. Even if this not an attempt to forecast a trend or future scenario, it allows to have an easy to read view of probable limits and oscillation parameters.
You may find, in yellow dashed lines, an attempt to assert the lowest and highest price threshold.
Just sharing my personal charts for learning purposes only. This is not an investment recommendation.