"They discovered that the Ethereum wallet used to transfer tokens during the attack was connected to another wallet used to collect winnings in a recent hacking

"They discovered that the Ethereum wallet used to transfer tokens during the attack was connected to another wallet used to collect winnings in a recent hacking contest by a participant who sometimes identified himself as UmbralUpsilon. Pulling up the participant’s registration, they saw that it linked to a profile on the collaborative coding platform GitHub." Opsec really isn't that difficult, you just have to give it some thought.