Escrow to protect international trade and co-operation.
In our Anarchic globe where governments only have domestic oversight, but no supreme leader "brutally coercing" them to obey some heinous international laws, there must be some way to ensure that voluntary trade is predominantly honest.
The Potential losses provoked by breaches of trust must outweigh any [potential] 'gains' from cheating one's customer or supplier.
Up until now, the Anarcho-Capitalists always had one argument up their sleeve with which they could criticise governments (that they support violent military and that military serves no useful purpose...), and for which I had no answer. But escrow is that answer. So, if any An-Cap or Libertarian supporters want to dispute that, I invite them to present alternative, non-violent/non-threatening, decentralised/non-authoritarian ideas for escrow that would ensure co-operative trade between isolated communities.