The proof is out there - you are just too lazy to look for it.  If you want me to do the work for you, I expect compensation.

You are a scammer - your words mean nothing.  If I were to provide you with the proof you asked for, you would not "bow down" to me or anything else.  You would say "whatever" and continue your scam.  You think the mods would enforce your agreement?  

So you see I'm not willing to waste my time.  Pay the 0.1btc or do the work yourself.

Simple as I can make it.

Edit:  I missed the part where the scammer said if I could find one of his keys that stopped working... don't know about that, but there are verified reports of many other keys from similar sellers that have stopped working.  He has no right to sell these keys, so they will stop working in the future.