Meaning of BatchOverflow
It is a bug in Ethereum smart contract which makes it vulnerable to exploit in which an hacker is able to create massive additional tokens above the maximum supply and trade it for huge profit. It affected few Eth smart contracts so far before it was solved in March/April, 2018.
Example: SMT token suffered the attack and saw more than 10times its token maximum supply generated and moved to exchanges with attempt to sell before been discovered and blocked in quarter of 2018.
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