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Poloniex has suspended all ERC-20 (Ethereum) deposit and withdrawal transactions recently. HitBTC Exchange has also initiated an internal audit and turned off the function of receiving deposits and remittances for auditing purpose. The next day, the OKEx Exchange decided to block the ERC20 transaction after discovering an error in Ethereum smart contract, which called batchOverFlow. HitBTC then announced to Twitter customers, "Due to a potential problem discovered in the ERC20 smart contract, we have begun an internal audit. All deposits and transfers on the ERC20 card will be checking online in order to match the test’s result. Please refer to the System Health page for online status."
In addition, other Exchanges have chosen to disable the token ERC-20 because of the new vulnerability discovered by Changelly Exchange and QUOINE.
It is still unclear about the number of errors existed and what specific tokens are affected by it, although it appears that BeautyChain (BEC) was one of the first tokens to be discovered the errors.
Crypto Exchanges has disabled BEC since April 22 and there is news about BEC being back into trading again.
Rothscointeam.
