The US government has launched a website for victims of FTX cryptocurrency exchange founder Sam Bankman-Fried's alleged fraud to communicate with law enforcement.

In an order late on Friday night, US District Judge Lewis Kaplan in Manhattan authorised federal prosecutors to use the website, and not have to contact victims individually.

FTX could owe money to more than 1 million people, making it "impracticable" to contact each, prosecutors had said.

Federal law requires prosecutors to contact possible crime victims to inform them of their rights, including the rights to obtain restitution, be heard in court and be protected from defendants.

"If you believe that you may have been a victim of fraud by Samuel Bankman-Fried, A/K/A/ 'SBF,' please contact the victim/witness coordinator at the United States Attorney's office," the website read. The website had gone live by Friday afternoon.

Bankman-Fried, 30, has pleaded not guilty to eight counts of wire fraud and conspiracy over November's collapse of FTX.

Prosecutors have said he stole billions in FTX customer deposits to pay debts for his hedge fund, Alameda Research, and lied to investors about FTX's financial condition.

The onetime billionaire has acknowledged risk management shortcomings, but said he did not consider himself criminally liable. (Reuters)