This is case of substandard programming. Ethereum’s solidity tutorial has clear instructions for avoiding integer overflow and underflow bugs. Third party contract audit should be defacto standard for token roadmaps.

Hi HN,

This week trading on several tokens got halted due to discovered & exploited vulnerabilities in two smart contracts. One of them lost about 90% of its value… and another one lost 26% - $40,000,000 in market cap.

We wanted to focus more on the technical analysis of the situation to shed some light on common vulnerabilities that still abound.

Would love your feedback, since we got some mixed reviews on whether we did a correct technical judgment of one of the contracts. Especially of the SMT token.