What Caused Ethereum to Delay Their Much-Awaited Hard Fork?

Ethereum Core developers announced on Tuesday that they would postpone their much-awaited Constantinople hard fork.
The team, which has previously settled January 16 as the official date for the Ethereum blockchain upgrade, decided to delay it after ChainSecurity found potential vulnerabilities in the code. The Switzerland-based blockchain audit firm said that Constantinople would enable “reentrancy attack,” whereby a pair of hackers can use the code to simulate a secure treasury sha