paper trailpaper trail
a series of records, consisting variously of correspondence, diaries, financial records, etc., that may serve as evidence as of a person's actions
A series of documents providing evidence of one's actions: “Judges leave a paper trail, a track record of opinions that tell, literally, where they are coming from” (Ellen Goodman).
(plural paper trails)
This term is used most often by lawyers and investigative journalists.