...
Perhaps we have just witnessed the death of proof of stake coins - a wallet in an exchange can hold and stake such a large percentage they can execute their own attack on the network. Or someone who can hack and take control of that wallet could kill the coin. Centralized much?
There are solution to that 30% attack possible:
Nova coin: Novacoin creators resolved this issue using balanced weighting scheme.
PPC: Centralized checkpoints.
BC : ( PPC + NOVA + own implementation of all in POS2.0 )
NXT: build up to resist 90%+ attacks...
VRC - had rollback to save stake holders asses
who left 1/3 of coin in one place and do not let it dump on market that is all
don't join into that shit whole POS family