R-20 — Original evidence preservation and custody log
Purpose: Keep originals traceable and distinguish them from working copies.

Record ID, collector, collection date/time and time zone:

Original source, lawful access method and precise location:

Original filename, format, size and optional verified digest:

Controlled storage reference and access class; no passwords:

Transfer history: from/to, date, purpose and receipt:

Working copies, annotations, redactions and version links:

Retention instruction, owner and review date:

Missing provenance, integrity concerns and escalation:

COMPLETION CHECKS
[ ] Do not overwrite or annotate the preserved original
[ ] Do not claim this worksheet proves court admissibility
[ ] Use approved storage and collect only necessary personal data

Prepared by:
Date:
Version:
Reviewer / approval:

Blank template. Keep completed records in the approved channel. This template does not grant authority.