Kraken said third-party security researchers found a vulnerability, which was fixed by the crypto exchange.The researchers secretly withdrew nearly $3 million and refused to give it back without seeing the bounty amount first, Kraken said.Blockchain code editor Certik said it found a vulnerability in Kraken's platform and claims to have been "threatened" by the exchange. 07:26Scammers Took Advantage of the Ethereum Merge to Make Millions: Chainalysis00:40$40M in Insurance 'Will Not Be Touched' t...