London-based investment firm Attestor Capital, the holder of an FTX bankruptcy claim, has filed a lawsuit against an FTX creditor, alleging that the creditor promised to sell two FTX accounts to the company but then reneged on the deal after the value of the claim skyrocketed. According to court documents, in June 2023 Attestor entered into an agreement with Lemma Technologies to purchase two FTX accounts.