I bought 11 BTC from someone and to prove they sent I had them take a s/s of the transaction. It has now been 3 days and I do not even see it in unconfirmed part of my wallet. Is there some way to cancel payments? Did he somehow scam me? We both use bitcoin wallet qt. Any help will be much appreciated.
I forgot to say that I reset the blockchain already and asked him to do so. (whether or not he did I do not know)