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When you deposit, you just deposit to the exchange wallet; where other deposits happen too. Same happens with withdrawl. So you don't do a point to point transaction between buyer/seller.
thanks a lot for that answer
but I'm still confused!
what I would like to know is: which coins really disappeared??
1) the ones the attacker deposited on BTER? (this seems to be confirmed by BTER)
2) the ones the attacker sold on BTER but still sitting in the buyer's BTER account? (this also seems to be the case)
3) the ones that were moved out of BTER buyer's account into other exchange accounts (in this case any other exchange should have a total of TRC which is less that the total of its clients' TRC individual holdings, the difference made by the disappearead TRC brought in there)
are all the three cases true?
thanks for your help
What is in you account is just a number. You don't have a separate wallet. Bter's TRC balance reduced after the attackers TRCs disappeared.
When buyers withdrew TRC, it MAY been partly the attacker's ones too. If no user reports that they have any TRC missing, there is a very strong possibility that Bter is hiding something.