I just read this article on how hackers get access to your sites code and change the pud ID of your adsense
If you recently had a sudden drop in ad impressions this could be the issue!
advice from article
Read the entire blog post
http://www.jensense.com/
If you recently had a sudden drop in ad impressions this could be the issue!
advice from article
One could be to use the Google Sitemaps verification process. If I verify my SiteA.com through sitemaps using the same Google ID that I use for Google AdSense, they could then offer a "Only use this AdSense publisher ID on this site" where I could then submit my publisher ID. So if another publisher ID showed up on a page on that site that was not the one I submitted, it could either override it or could raise an alert either in the AdSense control panel or the Sitemaps control panel that another publisher ID was placed on that site. And while a hacker hacking into a website could change the publisher ID appearing on the site, the hacker would still not have access to login using the Google account ID used by that publisher.
Read the entire blog post
http://www.jensense.com/