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.

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.

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