Isn't this unsafe?
I'd rather just send him directly the sum, without risking it in the hot wallet.
I imagined there was a feature which automated that, such as "pending withdrawal" you had to manually send, but already had a destination address set by the user.
I never got the 'pending withdrawal' feature set up. I can see in the logs what address people have tried to withdraw to, but I can't be sure they still want a withdrawal of that amount to that address.
There were several hundred coins in the JD hot wallet most of the time the site was running, to allow big players to withdraw instantly, and it never proved to be a problem.
The 300 BTC were pulled from the hot wallet last night, so I've put the rest in there now. This time I've split it up into 10 equal pieces, so the withdrawal should go more smoothly this time. (I don't spend unconfirmed chance, so if there's a single large output in the wallet and you try to withdraw your balance in two equal parts, the first withdrawal will leave unconfirmed change in the wallet, and you'll have to wait for it to confirm before your second withdrawal will be allowed. That's what happened last night).