1. Advertising or publicity materials for writing papers: If this person or organization publishes advertisements or publicity materials for writing papers in public, then this is one of the most powerful evidences.

2. Chat records and emails: If this person or organization has correspondence records with customers or orderers, these chat records or emails can prove that the other party has accepted the entrustment of writing on behalf of others, or has acted improperly as an academic tutor.

3. Original papers and transcripts: If you can get the original papers written by others and the corresponding transcripts, you can prove that the papers were written by others.