There is any collateral you put on scrow? I got a quote from you, but I have my doubts... lets imagine this situation:

* I assume you have 1.000.000 ethereum
* I put 10 BTC to scrow, you put the proportional ETC

Now, what can happen at market opening:

* ETH goes x10, then you may choose to loose the ETC of the scrow since it will more profitable to sell the ETH instead of having the BTC
* ETH goes to 1 cent each... you may choose to deliver the ETH since the BTC worth more.

Seeing this, it is always a win situation for you, so I want to know if there are clauses to protect both sides and have win-win situation.