A draw you can prove

The winners come from two things and nothing else: the draw code and the list of entries. Same code plus same list, same winners — today, in a year, on any computer. So you show the code before drawing, and afterwards anyone can repeat the draw and check it themselves.

A short code calculated from the names. Change one name, add one or remove one, and the fingerprint changes. It is what stops someone from quietly editing the list after the draw and claiming the same code proves it.

Every entry has the same chance. The order comes from a Fisher–Yates shuffle fed by the code, which is generated with your browser's cryptographic random. What it is not is unpredictable to you after the fact — and that is on purpose: an unrepeatable draw cannot be proven.

No. Everything happens in your browser: nothing is uploaded, and the list is saved only here so you do not lose it when you close the page.

For the winner who never replies. They come out of the same draw, in order, so you do not have to run it again — and the record already shows who they were.