Finding the main address of a transaction

[leek_rs]

When someone sends a payment to my address, I need to find their primary address, the one they control. But it's obscured by all the output/input addresses. I can't figure out which address is the one they control. How do I find that?

[nandika]

you should ask the sender of the transaction.
Sometimes they can send it with an address they don't control, like as an mtgox withdrawal, or from another exchanger...
Safest is to ask.

[CIYAM]

I am guessing you are trying to work out where to send funds back to (most likely for the purpose of some sort of gambling game) - the short answer is that you *cannot* determine this as the protocol doesn't have such information.

If you want to be able to reliably send money *back* to an address you should ask the user/player to provide a "payment" address.

[leek_rs]

I see. Thanks