[thaumasiotes]

> Blackmail / extortion / compromise trap right there. Don't email em, don't talk to em.

> If you're an American and you go there, they have dirt on you and can threaten to reveal it if you don't play ball with them.

Perhaps, but they'd lose the ability to promise other people that their relationship with North Korea was safely secret. I wouldn't worry about this; I suspect North Korea really does want to maintain its ability to have skilled foreigners come and help if they're so inclined.

I understand some people maintain two passports, one for Israel and the other for the rest of the Middle East. This is a similar thing. I wouldn't expect Iran to insist on disclosing an American's visit to the US government either.