It's important to know what the limits are for an ETH rollback. pic.twitter.com/lzToQwn4tf
— Riccardo Spagni (@fluffypony) June 2, 2017
No. Casper can survive 51% attacks happening once in a while; we can just delete the attackers' deposits and keep going.
— Vitalik Non-giver of Ether (@VitalikButerin) June 4, 2017