比特币 v0.1 发布
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哈尔·芬尼写道：
- 垃圾邮件发送者的僵尸网络可以轻易绕过按发送付费的电子邮件过滤器 如果工作量证明代币确实变得有用，尤其是如果它们变成货币，机器将不再闲置。用户会期望自己的计算机能为他们赚取金钱（假设奖励高于运行成本）。一台计算机的收益被僵尸网络窃取时，其所有者会比今天更容易察觉，因此我们可能会预期，在那个世界里，用户会更加努力地维护自己的计算机并清除其中的僵尸网络感染。
如果工作量证明代币具有价值，还有另一个会减轻垃圾邮件影响的因素：人们会有经济动机去建立大量虚假电子邮件账户，从垃圾邮件中收集工作量证明代币。他们本质上会用自动邮箱向垃圾邮件发送者反向发送垃圾邮件；这些邮箱收集他们的工作量证明，却不阅读邮件。虚假邮箱与真实用户的比例可能会变得过高，以至于发送垃圾邮件不再具有成本效益。
这个过程有可能首先建立起工作量证明代币的价值，因为没有僵尸网络的垃圾邮件发送者可以从收集者那里购买代币。虽然回购会暂时让更多垃圾邮件通过，但这只会加速那个导致收集者过多、从垃圾邮件发送者身上获利的自我挫败循环。
有趣的是，某个电子黄金系统已经有一种名为“撒尘”的垃圾邮件形式。垃圾邮件发送者发送极少量的金尘，以便把垃圾邮件放进交易的评论字段。如果系统允许用户配置他们愿意接收的最低付款金额，或者至少允许配置一条带有消息的付款的最低金额，用户就可以设定他们愿意为接收垃圾邮件而获得多少报酬。
中本聪
英文原文
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Hal Finney wrote:
- Spammer botnets could burn through pay-per-send email filters trivially If POW tokens do become useful, and especially if they become money, machines will no longer sit idle. Users will expect their computers to be earning them money (assuming the reward is greater than the cost to operate). A computer whose earnings are being stolen by a botnet will be more noticeable to its owner than is the case today, hence we might expect that in that world, users will work harder to maintain their computers and clean them of botnet infestations.
Another factor that would mitigate spam if POW tokens have value: there would be a profit motive for people to set up massive quantities of fake e-mail accounts to harvest POW tokens from spam. They'd essentially be reverse-spamming the spammers with automated mailboxes that collect their POW and don't read the message. The ratio of fake mailboxes to real people could become too high for spam to be cost effective.
The process has the potential to establish the POW token's value in the first place, since spammers that don't have a botnet could buy tokens from harvesters. While the buying back would temporarily let more spam through, it would only hasten the self-defeating cycle leading to too many harvesters exploiting the spammers.
Interestingly, one of the e-gold systems already has a form of spam called "dusting". Spammers send a tiny amount of gold dust in order to put a spam message in the transaction's comment field. If the system let users configure the minimum payment they're willing to receive, or at least the minimum that can have a message with it, users could set how much they're willing to get paid to receive spam.
Satoshi Nakamoto