He doesn’t have to post an appeal bond (otherwise known as a supersedeas bond) to appeal but not doing so means the plaintiff can seize the money pending the outcome of the appeal and can do so how they see fit after 30 days of the judgement.

So on the one hand he could put up various properties as sureties to a bond company and post bond and at least retain control & income from those properties pending appeal. Or he can fail to post bond let the plaintiffs seize what they like regardless of the harm it causes his reputation and business. I’m pretty sure E Jean Carroll and New York would be quite happy to force him to sell off Trump Tower or whatever else to meet his obligations.

But regarding surety & bond, I wonder what bond company would trust Trump’s valuations of his own properties. They’ll probably demand he put so much up in surety that he’d balk at it. Hence why shady foreign business men might enter the picture.