<p></p>
<p>I don't think that it would be so rare. There's many cases where one trader is unable to continue through a trade and mediators need to do a manual payout. The incentive for the trader who has the data to publish the delayed payout in their favour and not cooperate with mediator would be very big. An attacker could exploit Bisq to make the other node fail and send the delayed payout to himself.</p>
<p>Your potential solution, as delayed payouts are already signed, could make mediators once again be seen as money transmitters. They would be holding a signed transaction to send locked BTC. It's still not a private key, but they would have a way to benefit one of the traders (or Bisq, if you only enable them to use the delayed payout number 1).</p>

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