Microfluidic Cartridges for Field-Deployable Temporal and Spatial Validation

This paper describes a practical implementation architecture for temporal and spatial validation using disposable microfluidic cartridges. Building on prior work in multi-reference timekeeping and environmental validation, we propose low-cost, field-deployable devices that leverage chemical kinetics, biological processes, and environmental sampling to provide tamper-evident proof of elapsed time and geographic presence. Two specific implementations are detailed: (1) a chemical optotransducer cartridge using enzyme kinetics for temporal validation, and (2) a passive aerobiological sampler for location authentication through pollen and spore profiling. These devices would require no external power for operation and would provide visual readout mechanisms suitable for field environments. Applications would span military operations in GPS-denied environments, supply chain authentication, treaty verification, and critical infrastructure protection. This work is presented as a design study and prior art disclosure; experimental validation of prototype devices is beyond the scope of this publication due to resource constraints inherent to independent research.