I can broker a domain purchase in bitcoins.
Lol. Bad idea buddy.
Tell me the horror story, or would it be a bad idea for OP?
It's the equivelant of you renting a house in your name for him. The only way to give it to him fair and square would cost him the same fee you paid x2 so it's extremely inefficient and on top of that, you'd be registering it with your credentials which means:
1) You could take it back from him if you were a cheat; or
2) You could get in trouble for his actions in using the domain.
There are obviously certain conditions that could be met, but I'd say just stay away from registering domains for other people altogether. ^_^