Are all trades stored in block chain?
Are all trades, like mtgox exchange, gambling, etc. stored in block chain? Or, few trades could have been skipped / ignored?
Consider this case, 'a' transfers 10btc to 'b', and then 'b' transfers 10btc to 'c'. Is it possible to store this as single trade, as 'a' transfers 10btc to 'c'?
Is it possible for an exchange to include fake bid/ask orders for it's own benefit?
Is it really possible to differentiate between two transfers, where in one transfer is between single user accounts and another one is between two users?