Satoshi Nakamoto https://www.metzdowd.com/pipermail/cryptography/2008-November/014818.html satoshi at vistomail.com Mon Nov 3 11:23:49 EST 2008 Previous message: Bitcoin P2P e-cash paper Next message: IBM Zurich Research Laboratory Internet Transaction Security on Your Key Chain Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]

Thanks for bringing up that point.

I didn't really make that statement as strong as I could have. The requirement is that the good guys collectively have more CPU power than any single attacker.

There would be many smaller zombie farms that are not big enough to overpower the network, and they could still make money by generating bitcoins. The smaller farms are then the "honest nodes". (I need a better term than "honest") The more smaller farms resort to generating bitcoins, the higher the bar gets to overpower the network, making larger farms also too small to overpower it so that they may as well generate bitcoins too. According to the "long tail" theory, the small, medium and merely large farms put together should add up to a lot more than the biggest zombie farm.

Even if a bad guy does overpower the network, it's not like he's instantly rich. All he can accomplish is to take back money he himself spent, like bouncing a check. To exploit it, he would have to buy something from a merchant, wait till it ships, then overpower the network and try to take his money back. I don't think he could make as much money trying to pull a carding scheme like that as he could by generating bitcoins. With a zombie farm that big, he could generate more bitcoins than everyone else combined.

The Bitcoin network might actually reduce spam by diverting zombie farms to generating bitcoins instead.

Satoshi Nakamoto