A major cryptocurrency exchange says it was the victim of a sophisticated hack that stole about $1.5 billion worth of digital currency, marking one of the biggest online thefts of all time.

Ben Zhou, Bybit's CEO, said that the hack had affected around 401,000 Ethereum and sparked a surge in withdrawal requests.

Mangione, 26, didn’t speak at the hearing. Judge Gregory Carro ordered him to remain handcuffed, calling it a security measure. Mangione’s lawyer, Karen Friedman Agnifilo, argued that the sight of Mangione in shackles in the closely watched case was robbing him of his presumption of innocence.