As far as the merchant end you can get the BTC turned into USD immediately if you choose. I integrated coinbase payments into my sites a few months ago. You a

As far as the merchant end you can get the BTC turned into USD immediately if you choose. I integrated coinbase payments into my sites a few months ago. You also have the option of holding them in BTC. The technical side of what they are doing I'm not sure about that. Unless they have a huge pool of cash to buffer this money conversion they are probably selling the BTC behind the scenes.