Sam Bankman-Fried, the founder of the FTX cryptocurrency exchange who was convicted of fraud and conspiracy, was transferred out of a Brooklyn detention center on Wednesday morning, his spokesman said.

Mr. Bankman-Fried’s final destination wasn’t clear, said his spokesman, Mark Botnick. Before the transfer, Mr. Bankman-Fried, 32, told people close to him that he expected to be moved to a federal correctional facility in Mendota, Calif., a person with knowledge of the matter said.

A representative for the Bureau of Prisons declined to comment on Mr. Bankman-Fried, citing “privacy, safety and security reasons.” A spokesman for the prosecutors who oversaw Mr. Bankman-Fried’s case did not immediately respond to a request for comment.

Mr. Bankman-Fried’s transfer was reported earlier by The Wall Street Journal.

In March, Mr. Bankman-Fried was sentenced to 25 years in prison, after he was convicted of defrauding FTX’s customers, investors and lenders. Prosecutors said that he orchestrated a yearslong fraud, siphoning $8 billion from customer accounts to finance venture capital investments, political contributions and real estate purchases.

When he was charged, Mr. Bankman-Fried was granted bail and confined to his parents’ house in Northern California. The judge overseeing his case revoked his bail in August, saying that he had tried to intimidate a witness.

Since then, Mr. Bankman-Fried has been confined to the Metropolitan Detention Center in Brooklyn. After he was sentenced in March, Mr. Bankman-Fried asked to remain in the detention center while he works on an appeal challenging his conviction.