Mr. Bankman-Fried, the founder of the collapsed FTX cryptocurrency exchange, was convicted last fall and is serving a 25-year sentence in prison.

Sam Bankman-Fried, the founder of the collapsed cryptocurrency exchange FTX, filed an appeal on Friday, attacking the judge who oversaw his conviction on charges that he orchestrated a sweeping fraud to steal $8 billion from customers.

A federal jury found Mr. Bankman-Fried guilty of fraud, conspiracy and money laundering after a monthlong trial in New York last fall. In March, Judge Lewis A. Kaplan of Federal District Court in Manhattan sentenced Mr. Bankman-Fried to 25 years in prison.

In the 102-page appeal, a lawyer for Mr. Bankman-Fried called for a new trial, pointing to several rulings by Judge Kaplan that limited the FTX founder’s ability to introduce evidence and hampered his defense.

“Sam Bankman-Fried was never presumed innocent,” wrote the lawyer, Alexandra A.E. Shapiro. “He was presumed guilty by the judge who

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