Cryptocurrency miner Core Scientific Inc. filed for chapter 11 bankruptcy to hand control to creditors, a further indication of the squeeze on mining companies from declining bitcoin prices and rising electricity costs. The Austin, Texas-based data processor filed for bankruptcy protection in the Southern District of Texas on Wednesday, and has agreed to a proposed restructuring plan provided by a group of noteholders that would convert debt into 97% ownership of the company, subject to dilution. Current stockholders, often wiped out when companies go bankrupt, would receive some shares and warrants in the restructured business, according to bankruptcy papers.