While my mind is on withdrawals, some quick hygiene:
1) never send identical withdrawals twice, it'll make your accounting a nightmare. Send 0.9 and 1.1 instead of 2x 1.
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The problem comes if one lands and the other gets stuck--it's a pain to figure out which is which. E.g. you send 1 BTC from X and Y to Z; 1 lands at Z. Which of X and Y do you have to chase?
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Yeah you can do it (if the deposit exchange gives it, not all do)--just makes your life a little bit easier not to have to.

