Get a dox on him. Worked for btc-arbs
Ok, I've looked this up on Urban Dictionary

I'd have no objections if somebody wanted to do this, but I would stress that the name he used in the contract is my first encounter with that name; it could be fake for all I know.
If I were to have gone ahead with the contract, I would've insisted on exchange of government-issued IDs, but it didn't get that far.