Blockchain is a technology, and an exchange is a place for people to trade. They are two different things, which makes me sway against it slightly. However, it is a juicy combination. Take offers on it, see what comes your way
I should have been more clear, sorry about that. Its a sweet domain. Some domains I am hesitant to pin an estimate against. With specific domains that are capable of strong bids (like this one), it is better to wait and take offers. Price the domain accordingly, depending on who the buyer is and their capabilities. IMO