I am new in big amount domain trading . How can i ensure its a legend buyer?

I am too much worried about it i dont know this is the right place of category of this forum . I have a domain name recently i got a email from some of a uae broker and client they want this domain and they are offering me 34000 usd . I am quit pleasant to hear that and ..currently i am selling domains but this is deal, is a huge amount for me . How do i know this is not a scam or not ?