Thanks for the stamper link, I was hoping something like that existed.

The latter could be helped by some stamping service that would allow you to include your name in the stamping request, with some publicly available provision for finding out how many requests someone made in a time period. If Carl actually attached "Carl Shulman" to the request, and to no others, and we had independent reason to believe that was his True Name, we could assume he wasn't running the 10^1024 scam.