In order to provide a methodology to detect bubbles in time series, Phillips, Wu, and Yu [23] proposed the supremum augmented Dickey-Fuller (SADF) test. This applies a series of right-tailed unit root tests to expanding windows of a time series (with a fixed start date), defined by where r2 is the final data point to be considered in each window, starting at r0 which is a fraction representing the smallest allowed window size and expanding to 1(the complete data set).
Fig 7. Visualisation of the average wavelet coherence values for bubble (solid) and non-bubble (dashed) regimes decomposed by period band.

The SOL/USDT pair could now drop to the support line of the channel. A strong rebound off this support will indicate that the up-move remains intact. Both moving averages are sloping up and the RSI is in the positive territory, signaling that bulls have the upper hand.
But the industry is only in its infancy and constantly evolving. It’s difficult to predict where things are headed long-term, but in the coming months, experts are following themes from regulation to institutional adoption of crypto payments to try and get a better sense of the market.