Bug vulnerability is discovered in Pivx
https://cointelegraph.com/news/pivx-possibly-other-pos-chains-vulnerable-to-bug-attackers-profit

The vulnerability has only been shown to affect Proof of Stake version 3 coins.

Proof of Stake Version 1 : Used Coin-Age

Proof of Stake Version 2 : Removed Coin-Age and moved to block depth

Proof of Stake Version 3: Used Block Depth and other modifications  
 

ZEIT is a Proof of Stake Version 1 Coin that uses Coin-Age so it is immune to the Fake Stake bug.  



FYI:
Pivx Team released a response to the article.
https://pivx.org/a-response-to-the-article-pivx-and-200-pos-chains-currently-vulnerable-chains-already-under-attack/

The BIG difference is... It is closed source until now. Would not touch it with POO ON A STICK right now... Probably just another clone of a clone of a clone using Yespower algo.