In documents filed to bankruptcy court in Delaware on Wednesday, Chainalysis was identified as a creditor and asked for any relevant materials to be sent to its lawyers.

The blockchain analysis firm had a longstanding relationship with FTX, going back to at least 2019, when the two joined forces to revamp the exchange’s anti-money laundering (AML) and know-your-customer (KYC) systems.

Chainalysis was also one of 53 companies which FTX confirmed earlier this year it was doing business with to Forbes.

Others on the list include big four accounting firms Deloitte and PwC, payments provider Stripe, and a cadre of law firms.

Yesterday’s filings do not specify how much money Chainalysis may be owed.