Once the coins show up in your wallet usually in about 5 seconds then they are for all practical purposes yours and cannot be reversed.  If I was a merchant I would confidently accept that as final for any transaction under $2000.  It is theoretically possible to have a hacker come into your store and trick you with this method but not really something to worry about IMHO.  The payment processors would guarantee your funds based off this method for 1% fee and convert to dollars too.  So my advice is to not worry about it, if you have a very large transaction that might make it worth the time for someone to pull of a very complicated and (mostly unprecedented?) attack on your store, then make them wait the 20 min.

Hope that helps... Try it out and you will see there is really nothing to worry about.

I got this as a gift from a casino in Atlantic City.  Asking 4 BTC ($1600) including insured shipping with signature.  This is the model that has a 13.3" screen with retina display, 2.8Ghz, 8GB, 512GB flash.  The box is unopened and it goes for $1700 online.  You can also pick it up in person in the Philadelphia area or Atlantic City.  I'll entertain lower offers but I will be putting it on craigslist for a week before I sell it for less.

I am willing to ship it overseas (from USA) but you will need to add the price of shipping which according to my UPS store will be about 0.5 BTC depending on where you live.  I'll ship it anywhere my local UPS store will allow and also with whatever declarations/instructions you specify but in the case of international sales the risk of it not arriving will have to be entirely yours.

Send me a message if you are interested or have any questions I check fairly frequently.  Include your phone number if you want and I can text pictures.

Thanks for looking.

I'm currently pointing my SHA miners to GHASH because of the 0% fees and merge mining.  I would like to use P2POOL, I'm not worried about the variance but I want to continue to merge mine coins.  As far as I can tell I could setup my own node and do this.  I'm not a total newbie but I think this task is beyond my abilities by reading through the guides.  So if anyone knows what kind of VPS hosting would be necessary for this I can pay for it and pay you to setup this node with the merge mining included.  I think maybe it's not cost effective to merge mine everything(?) according to what I would have to pay in server costs, but as many as would be profitable I would be interested in.

So, if you are interested in doing this please let me know what kind of VPS service I would need, what coins you would set up to merge mine, and also how much you would charge to do all this.  I will then decide if it is cost effective to do this.  Also maybe the cost of the VPS will make this not cost effective, I am also open to hosting the Node on my home connection, but I'm not sure exactly how this would work, maybe you could set everything up on a raspberryPI for me or you could log into my box remotely?

Miners are located in the USA east coast.

thank you