Ladies and gentlemen, DeFi is making headlines again. The Truebit protocol has been hit hard—hackers directly stole 8,535 ETH, worth over 180 million RMB. You might think it was a sophisticated attack method, but actually? Quite the opposite.

The hacker used a ten-year-old, well-known "integer overflow" vulnerability. Truebit's Purchase contract, when calculating prices, lacked any overflow protection for integer addition. This single oversight allowed the hacker to mint astronomical amounts of $TRU tokens at almost zero cost. They cashed out and ran, executing the entire process smoothly, like walking into an open vault.

Ironically, this isn't the first time they've fallen into this trap. Projects like BEC and SMT were directly wrecked years ago due to the same vulnerability, and some projects are still making these basic mistakes. Honestly, this is gambling with users' funds.

SlowMist Security Team has already sounded the alarm: all contracts developed with Solidity versions below 0.8.0 must immediately add SafeMath protections to all arithmetic operations. Otherwise, your project could be the next to be exploited. This is not alarmist talk; it's a real lesson. The security bottom line of the ETH ecosystem requires every developer to take it seriously.