SN-0837 已核对来源，附原文与上下文。
很多大型 ISP 每次连接都给你分配新 IP，通常在同一个 B 类网段内（a.b.?.?）。也许应该给每个 B 类网段设置两次投放之间的最短间隔。
Many big ISPs give you a new IP every time you connect, usually in the same class B (a.b.?.?). Maybe you should have a minimum time between payments per class-B.
如果解决不了，也可以不断降低每次发放的比特币数量直到可控，并始终要求验证码。
If you can't solve the problem, you can always keep lowering the amount of bitcoins given until it's manageable, and always require captcha.
