Cryptographer and early Bitcoin developer Adam Back, along with two affiliated companies, is asking a U.S. court to enforce a $28 million arbitration award against Chinese chipmaker Innosilicon, alleging the company knowingly supplied defective Bitcoin miners.

In a petition filed Monday in the U.S. District Court for the Southern District of New York, Malta-based Back, Blockstream Corporation of Canada, and California-based Thigmotropism LLC requested confirmation and enforcement of two arbitral awards issued by the Hong Kong International Arbitration Centre (HKIAC) in December 2023 and February 2024.

The petitioners are seeking to enforce the award under the Convention on the Recognition and Enforcement of Foreign Arbitral Awards, commonly known as the New York Convention. As of now, Innosilicon has not filed a response in the U.S. proceedings.