SN-10007 附来源、原文与上下文。
引用的来信John Levine来源 ↗引用的中本聪旧文中本聪来源 ↗只要诚实节点掌握网络中最多的 CPU 算力，它们就能生成最长链，超过任何攻击者。
As long as honest nodes control the most CPU power on the network, they can generate the longest chain and outpace any attackers.
但事实并非如此。坏人经常控制着由 100,000 台甚至更多机器组成的僵尸网络。我认识一些维护垃圾邮件僵尸机黑名单的人，他们告诉我，经常一天就看到一百万台新僵尸机。
But they don't. Bad guys routinely control zombie farms of 100,000 machines or more. People I know who run a blacklist of spam sending zombies tell me they often see a million new zombies a day.
这也是 hashcash 在今天的互联网上行不通的原因 ——好人的计算能力远远不如坏人。
This is the same reason that hashcash can't work on today's Internet -- the good guys have vastly less computational firepower than the bad guys.
谢谢你提出这一点。
Thanks for bringing up that point.
我那句话其实还可以说得更明确。要求是，好人合计拥有的 CPU 算力要超过任何单个攻击者。
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.
会有许多较小的僵尸网络，它们的规模不足以压倒整个网络，但仍能通过生成比特币来赚钱。这样一来，较小的僵尸网络就是“诚实节点”。（我需要找一个比“诚实”更好的词。）越多的小型僵尸网络转而生成比特币，压倒网络的门槛就越高，使得更大的僵尸网络也变得不足以压倒它，于是它们不如也去生成比特币。按照“长尾”理论，小型、中型和只是较大型的僵尸网络加在一起，规模应该远大于最大的僵尸网络。
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.
即使坏人真的压倒了网络，也并不意味着他会立刻发财。他能做的只是拿回自己花出去的钱，就像开出一张退票支票。要利用这一点，他必须先从商家那里买东西，等货物发出后，再压倒网络，试图把钱拿回来。我不认为他靠这种类似盗刷的骗局，能赚得比生成比特币更多。有了那么大的僵尸网络，他能生成的比特币会比其他所有人加起来还多。
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.
比特币网络实际上可能会让僵尸网络转去生成比特币，从而减少垃圾邮件。
The Bitcoin network might actually reduce spam by diverting zombie farms to generating bitcoins instead.
Satoshi Nakamoto
Satoshi Nakamoto
