The contract used by the hacker was deployed by me? Recently, @eth_strategy reported a small-scale crypto theft (a few tens of thousands of USDT). A white hat traced the transaction and found me, saying that one of the contracts used by the hacker was deployed by wtfacafemy.eth, and asked if I knew the hacker. I was like, I haven’t hacked anyone, but after carefully checking the transaction records, the contract was indeed deployed by me. After digging into it, turns out it’s a batch transfer contract I wrote two years ago: http://batch.money. Since the contract was written in Huff, not Solidity, it couldn’t be open-sourced. The white hat didn’t know what the contract was for, so they had to ask me Huff is a low-level Ethereum smart contract language. Contracts written in Huff are super optimized, but the learning curve is steep—it’s almost like writing bytecode. Unfortunately, the Huff team isn’t maintaining it anymore; it’s become a relic of the past. But hey, looks like the contract I wrote is pretty efficient, even hackers are using it @WTFAcademy_