So, I understand that under libertarianism, there is seemingly nothing complicated with judges and courts—they will continue as they were. But who will execute the sentence, and on what grounds should one trust a particular person to carry out a court judgment?

anonymous question

With judges and courts under ancap, not only will nothing be difficult—it will be much simpler than it is now.

Currently, one must perform a multitude of strange ritualistic gestures just so the monopolist condescends to review a request and decide something, and these processes drag on insanely long; very often, both litigating parties end up as victims in fact, while only all sorts of intermediaries benefit from the procedure.
The majority of disputes under ancap will resemble modern commercial arbitration: when establishing certain relations, the parties decide in advance whom they trust to resolve their conflicts, and then, having sought a court, voluntarily execute its decision.

In situations where the parties, while establishing relations, do not fully trust each other’s integrity, they can immediately deposit a sufficiently large sum each, granting the arbitrator the right to deduct a penalty from the deposit in favor of the party to whom that penalty is awarded after the conflict is resolved.

An indispensable condition of a court is the voluntary consent of the parties to execute any of its decisions in advance. Forcible summons to court, as well as the forcible execution of a court sentence, is simply ritualized retribution.

Will there be an institution of such retribution under ancap? Yes, it is quite likely there will be.

Imagine that Bob caused some damage to Alice and disappeared. Alice hires detectives and establishes who caused the damage, after which she seeks judgment from persons who are, in her opinion, sufficiently authoritative: what compensation she could forcibly seize from Bob. The court examines the evidence and becomes convinced that the damage was indeed caused by Bob, then decides what compensation would be appropriate, and Alice, with the court decision in hand, begins to seize Bob’s property. The more authoritative the court Alice turned to is for those guarding Bob’s property, the easier it will be for her to achieve the seizure. Sooner or later, Alice receives her compensation, rewards everyone who helped her, and with that, her claims against Bob are exhausted (though he may still have claims against her, since the conflict between Alice and Bob was not settled amicably).

Finally, it may happen that Alice demands Bob’s head as compensation rather than property. Then, if the court recognizes her demand as justified, she, with this decision in hand, begins to hire bounty hunters, setting a reward for Bob’s head. They will be all the more willing to sign up for this work the larger the reward and the more authoritative the judge is for them. And here it will be in Bob’s interest to find Alice and try to reconcile with her (killing Alice may not be enough, as it would not cancel the contract on his head).

Bob, you shouldn’t have disappeared…