Riot Blockchain has engaged in several suspicious transactions that enrich insiders. Its latest transaction is paying $4 million upfront to a consulting firm called Ingenium that Hindenburg Research previously identified as a likely related party. The short seller believes Riot's transactions are among the most brazen they have seen in a US public company and questions remain about potential misuse of shareholder funds. A new director, Remo Mancini, was also appointed to key board positions.