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Exchange has a list of authorized middlemen. Client sends fiat to a middleman with bank transfer, and the middleman will deposit CNY to the client's exchange account. It could be done within 30 minutes
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Important question: can the middleman deposit
more CNY into his own exchange account, or he already has the CNY in his account and only moves the required sum to the client's account?
It works like the MtGox USD code or the BTC-E USD code.
However, I suspect that some "middlemen" are actually employed by exchanges.