NEW YORK - Sam Bankman-Fried was released on a US$250 million (S$340 million) bond package on Thursday while he awaits trial over the collapse of the FTX crypto exchange, which a US prosecutor called a “fraud of epic proportions.”

Federal prosecutors in Manhattan have accused him of stealing billions of dollars in FTX customer funds to plug losses at his hedge fund Alameda Research.

Bankman-Fried was not asked to enter a plea on Thursday. He has previously acknowledged risk-management failures at FTX, but has said he does not believe he has criminal liability.

His defence lawyer Mark Cohen declined to comment after the hearing in Manhattan federal court.

Mr Nicolas Roos, a prosecutor, told United States Magistrate Judge Gabriel Gorenstein that the bail package would require Bankman-Fried to surrender his passport and remain in home confinement at his parents’ home in Palo Alto, California.

He would also be required to undergo regular mental health treatment and evaluation.

Mr Roos called the package the “largest ever pre-trial bond.”

Bankman-Fried, 30, was arrested last week in the Bahamas, where he lived and where FTX is based, cementing the one-time billionaire’s fall from grace. He departed the Caribbean nation in FBI custody on Wednesday night.

Mr Cohen said he agreed with prosecutors’ proposed bail conditions. He noted that Bankman-Fried’s parents – both Stanford Law School professors – would co-sign the bond and post the equity in their home as assurance for Bankman-Fried’s return to court.

“My client remained where he was, he made no effort to flee,” Mr Cohen said.

Wearing a grey suit and leg restraints, Bankman-Fried sat flanked by his lawyers and nodded when the judge informed him that if he fails to appear in court, a warrant would be issued for his arrest.

He spoke only when asked by Judge Gorenstein whether he understood the conditions of his release, and that he could be charged with an additional crime if he fails to show up to court.

“Yes, I do,” Bankman-Fried replied.

Mr Gorenstein set Bankman-Fried’s next court date for Jan 3, 2023, before US District Judge Ronny Abrams, who will handle the case.

“I’m going to require strict pre-trial supervision,” Mr Gorenstein said, with conditions including electronic monitoring and a ban on opening new lines of credit or businesses.

He said Bankman-Fried had “achieved sufficient notoriety that it would be impossible” for him to hide without being recognised or engage in further financial schemes.

‘Fraud of epic proportions’

Bankman-Fried founded FTX in 2019. A boom in the values of Bitcoin and other digital assets propelled the exchange to a valuation of some US$32 billion earlier in 2022, making the Massachusetts Institute of Technology graduate a billionaire several times over, as well as an influential donor to US political campaigns.

But concerns about commingling of funds between FTX and Alameda led to a flurry of customer withdrawals in early November, ultimately forcing the exchange to declare bankruptcy on Nov 11. Bankman-Fried later said at a New York Times conference that he had just US$100,000 in his bank account.

Mr Roos said that while Bankman-Fried had carried out a “fraud of epic proportions”, he had no history of flight and his financial assets had reduced significantly.

He said that evidence at trial would consist of testimony from “multiple cooperating witnesses”, as well as thousands of pages of written communications.

Just hours after Bankman-Fried’s plane from the Bahamas took off, Mr Damian Williams, the top federal prosecutor in Manhattan, announced that two of Bankman-Fried’s closest associates – former Alameda chief executive Caroline Ellison and FTX co-founder Gary Wang – had pleaded guilty and were cooperating with prosecutors.

Mr Williams has described the investigation as ongoing and urged others with knowledge of wrongdoing at FTX and Alameda to come forward. REUTERS