Some spam I got this morning:
"[Some app] uses unique private keys for each transaction."
If the security features of your app, which I've never heard of before, are such that you feel the need to advertise them through *spam*, what does it say about those very same features?
Marshall McLuhan famously said, "The medium is the message."
What message do you think you are sending when you are sending it through the medium of a spam comment on my blog?
I'll tell you: "I'm a liar and my app is shit."
I'd be hard-pressed to find a worse medium for your ad.