Record the human reviewer's decision with its source and the exact file version reviewed.
Log client proof decisions on the matching delivery card.
Your review cards show who made a proof decision and which file they saw. The reply time stays with the decision.
Keep a dated approval trail for each client deliverable proof.
Keep a clear history of who approved or rejected each campaign proof, even when the review board status changes later.
Keep proof decisions visible through client delivery handoffs.
Your proof tasks show who decided, which file version they reviewed, and who takes the next step.