For shure, I will keep up to date🔥I know , now is late for those changes, but for the next contest. In my opinion you can ask the 7 winners for proof. If you didn't steal the work... then you have nothing to worry about.
You have a big challenge and a few choices to make.
Don t know any onter way to prove the work, Maybe by sending the raw format... but not all photographer shoot in raw. ....hmm... taff...