中本聪致达斯汀·特拉梅尔：垃圾邮件、工作量证明代币与反向发送垃圾邮件（2009 年 1 月 25 日）
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Published verbatim by Dustin Trammell in November 2013. Full mbox archive distributed as Satoshi_Nakamoto.zip via Trammell's blog (https://blog.dustintrammell.com/i-am-not-satoshi/).
- 垃圾邮件发送者的僵尸网络可以轻易耗尽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，其所有者会比现在更容易察觉， 因此我们可以预期，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： 人们会有获利动机，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。 他们本质上会利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 消息。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。
这个过程有可能从一开始就确立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 那个自我挫败的循环，最终导致过多收集者利用 垃圾邮件发送者获利。
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， 以便把垃圾消息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， 或者至少配置可以附带消息的最低金额， 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
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- 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