Avi Eisenberg, known for exploiting Mango Markets in 2022 to gain approximately $110 million, has shown new on-chain activity, according to Arkham. Eisenberg's address recently signed a transaction, drawing significant attention from the crypto community. Previously, Eisenberg manipulated Mango Markets' price oracle and faced legal consequences, including arrest and imprisonment. The recent activity has sparked speculation about his potential return to the crypto space, though no additional details have been revealed.