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What if the buyer does a reversal of the bank transfer -- usually possible up to 60 days afterward. (I swear I'm not trolling. I'm new to bitcoin exchanges)

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ACH transfers are reversible and a few bitcoin exchanges have been bitten by them since most have/do take dwolla, which is a nice service for ACH transfers.

Bank wire transfers, though, are unable to be reversed. Its a pity that most US banks charge for them.

Yeah, the US banking system is pretty pitiful in general. We (Balanced) are trying to make it a little bit better by making ACH faster and easier to integrate, but we can't do much about reversals. [shameless plug] Example, checkout our ACH payouts feature: blog.balancedpayments.com/announcing-balanced-payouts/

Coinbase does ACH for Bitcoin, they usually hold the funds for 6 days to prevent fraud.

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