Posting bonds might be part of a solution, but there is still a question of who gets to decide whether or not something is abuse (or who is a victim, for that matter). The closest I've seen to this sort of system is OpenBazaar's use of "proof of burn":
> but there is still a question of who gets to decide whether or not something is abuse (or who is a victim, for that matter)
In principle, all you need is a trusted arbitrator that's acceptable to all involved parties. This is how "multiple signatures" work on Bitcoin already; the third-party escrow can decide who's going to keep the coins by adding her signature to either party's claim.
https://openbazaar.org/blog/why-proof-of-burn/