Although this test successfully detects single isolated bubbles, Phillips, Shi, and Yu [24] acknowledge it may suffer from reduced discriminatory power when applied to time series with multiple occurrences of bubbles. To overcome this weakness, a further enhancement was proposed, as a new method, called a generalized supremum ADF (GSADF) test. This test allows both the start and end points of data subsets to vary, which in turn enables the identification of multiple bubble regimes in one observed time series. The GSADF test is defined by
Additionally, crypto regulation outside the U.S. has changed over time, based on evolving regulatory guidelines. The fifth Anti-Money Laundering Directive from the European Union, for example, entails that crypto buying, selling and other operations must comply with certain guidelines in certain regions.

Ether and bitcoin rallied on Tuesday to record highs off the back of a weaker dollar, taproot upgrade and positive investor sentiment.
Some experts have already expressed concern that the inclusion of the Binance Coin on the platform may prove controversial in the United States. While Binance.US is described as a subsidiary, its business model might draw attention from the U.S. Securities and Exchange Commission based on the fact that BNB token acts as both a security and a utility token. As such, it could pass the so-called Howey test for being security, thus potentially becoming a snag on the Binance’s path to establishing itself in the US.