Merged mining but miner can't withdraw anything except BTC?
You have to register your merged mining payout addresses...
...which should be on the faq page...
...which I promised to put together and send in for them to put up there...
...before my family started driving me crazy...
On the website, bring up your stats for the BTC address you're currently mining to. Then go to the Register Merged Mining tab.
On that tab you can set up an alternate BTC payment address, and the alt-coin payment addresses.
When you do Instant Payout, that only does the BTC addresses (although, maybe it should do the alt-coins as well?).
I'll assume you're using Bitcoin-QT client, because I haven't attempted to sign anything with the daemon or other clients.
First off, go to the Receive Coins tab in your bitcoin client, highlight the address you're using to mine with, and at the bottom row of buttons, you have "Sign Message". Click that button, and you'll bring up the message signing window, with your mining address already filled in at the top.
To change the payout address for Namecoin(NMC), get the NMC address you want to have them sent to, and paste that address by itself into the large message box in BTC's Signature menu. Paste the same address into the Namecoin Address field on the website's Register Merged Mining page.
Then click the Sign Message button in BTC's Signature menu. It will show the digital signature in the field below. The icon to the right of that field will copy the signature to clipboard. Copy the signature, and paste it into the Signature field on the website, below where you put the NMC address.
Then click Register. (only do one kind of coin at a time... I tried doing em all at once, didn't work).
That's all there is to it... lather-rinse-repeat for the other alt-coin.
I'm not certain what the payout thresholds are. 10 IXC, 100 DVC, I think, dunno about the others. (and maybe they should automatically pay out if you haven't submitted a share for a week or two, even if you're below the threshold)
Anyways, that's all you need to get your alt-coin starting to be sent to you. If you don't change one (say, for Devcoin(DVC), if you're using Windows, because DVC doesn't have a win bunnie) then your alt-coin will stay at p2pmining, until you're ready to set up somewhere for them to go. (say, here: Vircurex
, for example).
I think that should do it, lemme know if I wasn't quite clear enuf on some of this... I'm working on getting it nice and clear to send in to the p2pmining peeps soon.