Brooks was acting comptroller when he exited the OCC in January. He joined the agency as chief operating officer in March 2020, and was nominated in November by President Donald Trump to serve a full five-year term as comptroller, but for that term to take effect would have required full Senate confirmation.
His tweet Friday said: "Letting you all know I have resigned as CEO of @BinanceUS. Despite differences over strategic direction, I wish my former colleagues much success. Exciting new things to come!"

Private key. Accessing the bitcoins in a digital wallet requires a private key—an alpha-numeric code of at least 16 characters (punctuation marks are encouraged!) that is far more comprehensive than a PIN. The private key, which should be kept entirely secure, enables you spend the bitcoins allocated to your account.
This is just one example, but it definitely highlights the difference between trading on Binance and Binance.US. Although small traders won't make much of an impact on either exchange, all else being equal, most traders would prefer to trade against the larger book, rather than the smaller one.