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).
More broadly, the U.S. has been slow to issue regulatory guidance for cryptocurrency businesses. The industry has generally appreciated regulators' care and caution to avoid hampering innovation or overregulating something so misunderstood, but the lack of clarity has also become restrictive for many looking to operate, develop, and grow their products and services. But Zhao appears to be undaunted by that.

With its bullish structure now invalidated, those looking for long positions will need to eye support levels at $2.44 and $2.2. Should the crypto market remain bearish (with BTC having a probability of revisiting $60-62K), these levels are likely to come into play.
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