Mining computer designer and cloud mining operation Cointerra files for bankruptcy, leaving debts up to 50 million USD and potentially 999 creditors unpaid. The Bitcoin mining sector is now in dire straits due to the raising operating costs of mining combined with the recent price drop. Cointerra, the manufacturer of the TerraMiner series of mining computers, has filed for Chapter 7 bankruptcy in the United States. The filing comes two weeks after the start-up was sued for US$1.5 million by C7 Data Centers Inc. over unpaid invoices. The bankruptcy process will see the company's assets liquidated to pay its creditors. …