Cryptocurrency exchange FTX, which has filed for US bankruptcy court protection, said it owes its 50 biggest creditors nearly $3.1 billion.

FTX and its affiliates filed for bankruptcy in Delaware on Nov. 11 in one of the highest-profile crypto blowups, leaving an estimated 1 million customers and other investors facing total losses in the billions of dollars. Meanwhile, authorities in the Bahamas — where FTX is based — are investigating whether any criminal misconduct occurred related to the company’s implosion.

The latest collapse to rock the market has raised questions over the opacity of big businesses in crypto, an industry often touted as more decentralized and transparent than traditional finance.