Related Clues:

• Record of financial transactions on a yearly basis for each advert
• Sequential written evidence
• Series of documents that trace a path, as suggested by this puzzle
• Documents proving who did what
• *Evidence in white-collar crime
• Hansel and Gretel should have tried leaving this, rather than breadcrumbs, as a more reliable, if bureaucratic, track record
• What might be followed in an investigation
• *Documentation leading to proof