EDIT: Deleted parent comment suggested hard forks to prevent 51 % attacks. See my response to your first comment - you can not simply prevent any 51 % attack b

EDIT: Deleted parent comment suggested hard forks to prevent 51 % attacks. See my response to your first comment - you can not simply prevent any 51 % attack by changing the protocol. By the way, I am not downvoting your comments, I am (usually) not voting on any responses to me but let the other users judge.