Salem

Anyway to get back to someone who breaks from a trade?

hunt them down and kill them

No way for trading scents perhaps?

Take care when trading. Always kin before hand (and then unkin - otherwise it shows when you/they are online) and do trades in parts if possible (if you're selling/buying 10 iron, do it 1 or 2 at a time rather than all at once). If a person scams you, don't trade with him/her again and warn other players not to trade with him/her. You can also post the character's name on the forum as a warning to other players.

There should be a bounty hunting skill on this game...

Well...that's what scents are for. But there's no scent for scamming someone in a trade, and without an official trading system that's not possible. The closest you're going to get right now is the trade stalls - but there are only 8 or so of those. I don't expect anything more than trade stalls to be included in the game - though Jorb recently stated that he'll be adding more stalls soon.