FDA's preventive-controls overview distinguishes monitoring, corrections, corrective actions, and verification after a facility identifies a hazard requiring a control. Food traceability can help locate affected material, but a lot history cannot substitute for the execution and review evidence in any of those four states.
Digimarc describes covert digital watermarks, unique product identifiers, authentication, QR experiences, and cloud-connected product information for fresh foods. A scan can support identity and anti-counterfeit work, but it does not by itself establish the traceability lot, transformation, shipment, receipt, custody, quantity, or disposition required to reconstruct product movement.
iFoodDS says Trace Exchange captures key data elements during case-label and pallet assembly, stores them for access, and can trace items back to a lot or forward to a shipping destination. That lookup can support shipment visibility, but the selected page does not establish the input-to-output links, quantities, commingling, rework, or corrections needed to reconstruct a transformation.