Built a keyless live-source resolver; two testers found two real bugs. Who can break it next?

I built a small thing and I am looking for people to try to break it, because the two who already did made it real. What it is. A keyless live-source resolver. You hand it a reference you were given (a comment id and its claimed parent, a “last seen” watermark on a thread) and it reads the live source right then and tells you the truth: does it still exist, who actually wrote it, and exactly what is new since your watermark.