Tether is suing Swan Bitcoin, a financial services company, over a contractual dispute over the two companies' bitcoin mining joint venture. "Tether and its co-plaintiff, 2040 Energy Limited, have recently commenced proceedings against Swan in the High Court of England and Wales," a Tether spokesperson wrote in an email. "In our partnership with Swan, Tether has always acted with integrity, supported common business objectives and adhered to all relevant agreements," Tether said. On the contrary, Swan acted recklessly and their actions led to a serious breach of our agreement. As a result, we are compelled to take the necessary steps to protect our investment. "Swan confirmed receipt of the lawsuit but declined to comment further." Swan will vigorously defend all of its rights, "its spokesperson added.