So couldn't you return a checkbox in send() function which must be clicked first to send? Not JS.
In your form you could do something like:
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And in the index.php file you could do something like:
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if ($_POST['antibotcheckbox'] == "aintnorobot") { $ret = $fb->send($address, $reward); } else { $ret = array( "success" => false, "message" => "Checkbox failure.", "html" => "You have to check the checkbox to prove you are not a bot." ); }
A scammer could easily read that "anticheckbox" variable and send it by default. It would be better if you used sessions and create a variable name for the input variable. Then the code would always be different.
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I could check it out for you but I'm really busy atm...