We eliminate 700-year-old physical padlocks from critical infrastructure and logistics. Our Sentinel retrofit modules turn any existing container, case, or storage cache into an intelligent, signal-silent sensor node. Authorized personnel access gear securely using offline smartphones, giving managers an automated audit trail without exposing the location to electronic tracking. Backed by €750k in venture capital, our technology has moved directly from successful trials in extreme Arctic military exercises to active field pilots securing high-value assets across the Nordic region.