Auger[0] has something like this:
"Reputation (REP) and (REPv2) is a cryptocurrency, used by reporters during market dispute phases of Augur. REP and REPv2 holders must perform work, in the form of staking their REP or REPv2 on correct outcomes, to receive a portion of the markets settlement fees. If you do not report correctly, you do not get the fees. If you report incorrectly, you lose your REP or REPv2. If you don’t participate in a fork (when the network has a very large dispute over an outcome), you permanently lose your ability to migrate your REP or REPv2 to a forked universe, making it functionally useless within the used version of the Augur Protocol, and in theory making it worthless. Passive holders of Reputation (REP or REPv2) that are not using their Reputation (REP or REPv2) within the Augur protocol to stake on disputes and forks are penalized. The treatment of REP and REPv2 within the Augur protocol is governed not by the Forecast Foundation but by the protocols smart contracts as described in the Augur white paper and documentation."
Other protocols may handle things differently.
> All of this can be solved by the law (eventually escalating to people allowed to use deadly force), but at that point why do you even need a blockchain?
Assuming if the law in all jurisdictions around the world were as sufficient for all cases presently and into the future. Also this assumes that its not the enforcers of a particular law aren't also the ones that the on chain claimant wants to take action against (again, the payout would need to be high enough for those to incentivize action against a particular jurisdictions enforcers, which need not necessarily mean engaging on the property, but anything to get the enforcers to back off even going after friends and family and their property in retaliation [which is more doable in jurisdictions who databases with such sensitive information have been compromised])