Ethereum Devs Fix Software After Berlin Upgrade Goes Awry

[Fawpac2]

In the early hours of Thursday morning, the Ethereum blockchain underwent a network upgrade. Very quickly, it became clear that something was wrong.
Just 294 blocks into the Berlin hard fork, there was a consensus error with one of the software clients, Open Ethereum, and nodes weren’t syncing to the blockchain. What that means is that anyone running that client—12% of all Ethereum nodes—essentially was unable to use the blockchain until the error was fixed. The problem even led to an outage on block explorer Etherscan.
That issue has now been fixed, according to developers with Open Ethereum, the second-largest software client after Geth. Ethereum users can utilize any number of clients, among them Geth and Parity Ethereum to actually get on to the blockchain. It’s very loosely analogous to choosing among different web browsers to get online—they all basically do the same thing in different ways. However, in this case, when Ethereum clients don’t agree on some basics, the whole blockchain is at increased risk of attack. source