Privacy-focused cryptocurrency, PivX is under attack. Their official twitter account has tweeted out about an undergoing attack on its blockchain. They have asked users to invalidate block to bring users running full node to get back to correct chain.
🚨 URGENT! 🚨 Please issue the following command #NOW in in the debug console of your #PIVX wallet! Details to follow.
Typing in aforementioned commands will unwind the affected blocks. It is a command that spreads message that there is a bad block and they should restart from block prior to this one. Other nodes will catch you up, rejecting the nodes sending invalidated hash.
To check if you are infected or not, visit explorer.pivx.link and type in that hash. If you cannot find that hash, then you are not forked and on correct blockchain.
Update – This is not really a 51% attack but it has caused blockchain to fork. It is important for everyone running full node to invalidate the block in order to stay on correct chain.