The name Varcode is short for variable barcode. Varcode is the developer of patented technology to enable scannable barcode labels to dynamically change based on prescribed time and temperature threshold conditions. These Smart Tags can be placed at the unit level and be scanned via any commercial scanner, smartphone app or web-based scanner to capture location and time sensitive temperature data, which are then uploaded to Varcode’s cloud-based, blockchain-enabled management system. The system provides real-time alerts via SMS and email to stakeholders and provides comprehensive track and trace provenance for temperature sensitive products such as perishable food and pharmaceuticals for safety, compliance and sustainability purposes.