回复：比特币水龙头的变更
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许多大型 ISP 每次连接时都会给你一个新 IP，通常位于同一个 B 类网段（a.b.?.?）。也许你应该为每个 B 类网段设置两次付款之间的最短间隔。
如果解决不了这个问题，你可以不断降低每次发放的比特币数量，直到局面可以控制，并且始终要求填写验证码。
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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.
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.