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If he succeeds he proves Etherium is also vulnerable to a 51% attack. but then I guess they can always just fork and have a redo right?

Yea it seems that way. So much for "immutable".

That's old news. He changed his mind because he didn't want to be evil as I stated in one of my previous posts.

Yep, in a subsequent post he indicated that he thought the damage to ETC holders would be wrong.