Yeah you can do that.
Some try do a 'custom registry' and then can do a 'cert lookup' in which then you can see if someone owns it and send a email of change of ownership. Plus also see if the decsription matches the card or if the number is not in the registry at all.
@Jesse: if theres something you want checked, i can look it up
Here is SGC page: click under the resources tab. (sometimes there a tab at the very top)
http://sgccard.com/
Here is a link to show what i am talking about as well:
http://sgccard.com/EditCustomSet.aspx?id=1858