Btw. Here you want to sell 900btc without proof of ownership.
In your offer to me via pm, you want me to sell btc online.
So in fact its not related.
Its a different Story. More reason for Not believe you a Single word.
I dont think that you have funds or Coins and i dont think you are legit.
Look If you're not buying don't haggle at the first place. You want proof? We don't just send screen shot or video clip just to show you proof of ownership. I can show you who so ever wallet I can and tell it was mine.
Doing the transaction is one of the proof of ownership dude, and the process I proposed is one of the best way to prove you have ownership of your wallet/coins.
If you still don't understand that just mind your own business and do not destroy someone's reputation by merely talking your mind.
I don't care what you think of me dude! Just bring proof I don't accept what you think!