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Two methods I have found to be the best against bots.
1. Advanced visual confirmation. Something where the background/image that the code is printed on isn't a solid color. Multiple colors, with "shadows" of fonts in the background.
2. Textual Confirmation. This is similar to visual confirmation, but it's much more versitle. You can have a question/statement on the registration where the user will have to answer it correctly. Can be anything.
2+2, are you a human?, what is this site name?, say hello, say i love hoser, ect...
Very effective.
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