I'm building ReCaptcha in my website using below example. I want to know how can I verify this in client site and server site. Is it sufficient to verify whether user has checked the checkbox on client side and not check on server site? Also I need to count how many times users has failed to verify captcha.
<html>
<head>
<title>reCAPTCHA demo: Explicit render after an onload callback</title>
<script type="text/javascript">
var onloadCallback = function() {
grecaptcha.render('html_element', {
'sitekey' : 'your_site_key'
});
};
</script>
</head>
<body>
<form action="?" method="POST">
<div id="html_element"></div>
<br>
<input type="submit" value="Submit">
</form>
<script src="http://ift.tt/1yW6XBL"
async defer>
</script>
</body>
</html>
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