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Process the signup nonce created in signup_nonce_fields().
<?php signup_nonce_check( $result ); ?>
Since: MU
signup_nonce_check() is located in wp-includes/ms-functions.php
Nonce functions: wp_nonce_ays(), wp_nonce_field(), wp_nonce_url(), wp_verify_nonce(), wp_create_nonce(), check_admin_referer(), check_ajax_referer(), wp_referer_field()
Nonce hooks: nonce_life, nonce_user_logged_out, explain_nonce_(verb)-(noun), check_admin_referer