Poly Network

Poly Network is a decentralised finance (DeFi) platform that allows users to transfer or swap tokens across different blockchains. This cryptocurrency trading platform recently became a victim to one of the biggest cryptocurrency heist ever recorded, with the heist amounting to 610 million USD.
Recently, hackers have returned nearly all of amount that was stolen. All funds except the $33 million worth of the tether digital coin have been transferred back. It had announced a bounty prize for those who can help uncover bugs and other lacunae in a digital framework.