The worry about a 51% attack, I have never really understood it. Can someone explain why they actually think it is an important threat? The only thing one can do with a 51 attack is double spend one's own coins. You can not steel anyone else's coins, you can not change the consensus rules. OK so you want to to double spend your own coins. I mean how much are we talking about here? you want to spend 500 mio 1 shot? and if so the person on the other of the transaction is not going to be suspicious? they will not say for that I want 10 blocks for the transaction to be confirmed? or someone wants to spend billions to "de-stabilize" the network to prove a point. I mean what is the big threat really? I don't get it