I wonder how I am supposed to sell bitcoins on an exchange. I have been considering several and have gone through the KYC/AML process for three exchanges. The problem is once I sell my coins they might ask me to prove where I got them from. Keep in mind I am not intending to withdraw the FIAT, I just want to sell high and rebuy lower, and withdraw the coins.
The problem with proving the source of my coins is, how the hell do I do it? I bought them on MtGox and they can't ask MtGox for verification. Even if they did, the coins have gone through several addresses over the years. I can't even trace it back to the MtGox purchase since they went through other exchanges (and got mixed).
So what is one supposed to do here?
Can you specify what are those 3 exchange are you talking about? So that we can know where the problem start came from, then regarding you bought from mtgox, you can't trace it back, don't expect that it will go back to you. Much better for you to shift in another exchange to start a new one. Just make sure the exchange sites you are going to trade in is legitimately legal.