How do you guarantee a trial by jury, if an entire jury could be paid actors? It's a bit silly to worry about that level of conspiracy. But even if it weren't

How do you guarantee a trial by jury, if an entire jury could be paid actors? It's a bit silly to worry about that level of conspiracy. But even if it weren't silly, there are easy answers. An oversight board, or revealing the jurors after the case is decided, or revealing the entire juror pool of 50 some-odd people, etc.