So lemme get this straight: it was a deliberate attack on the network? People are so damn stupid. Look, let me spell it out for you: if you attack the network, the coin loses value or becomes worthless. It is like robbing a bank with an empty vault. Now, I prefer that whoever this is stops scamming people, but at least don't be stupid about it!
but dev said that will make a checkpoint, as I understand around block 105 000 so any new coin after that block will stop exist no ?
You already can not dump, Bittrex disconnected wallet 3 days ago, as I understand no need to worry !?