You don't need proof — just a tip. Redline will locate the prior version, verify the change, and date it before anything is published. See Methodology for the full process.
This form currently opens the visitor's email client via a mailto: action — it has no backend yet. Before launch, wire it to a real inbox or a form service (Formspree, a serverless function, etc.) so submissions don't depend on the visitor having a configured mail client.