Further to the above, better results were found [24] compared to SADF when using a backward expanding window, which they introduced as backward SADF (BSADF). This performs the same supremum ADF test, but this time with a fixed ending point, r2, and backwards expanding window:
There have been previous reports that Binance.US keeps users’ USD in FDIC-insured accounts, but posts on the Binance.US site containing that information have since been deleted. While it doesn’t guarantee the same in case of a Binance.US hack, the international version of the exchange, Binance, covered all consumer losses after a $40 million hack in 2019.

In an interview from his home in the U.K., John Karony, SafeMoon’s 25-year-old chief executive officer, emphatically denied that his token is a Ponzi scheme. “I put everything, my identity and my credibility, on the line for SafeMoon,” he said.
Another institutional hit for bitcoin–which probably had the most sustained effect–was the SEC’s refusal to approve a bitcoin exchange-traded fund (ETF). This would be a path for more mainstream people in finance to dabble with blockchain; it would allow investors to dip their toes in bitcoin without owning the actual asset. Not only that, but it would make bitcoin available on the most prominent financial markets. The U.S. Securities and Exchange Commission (SEC), however, has yet to allow such a fund to exist–mostly because it is unable to monitor crypto-transactions in order to avoid market manipulation.