A fingernail-sized microchip from a French startup is quietly becoming a cornerstone of Europe’s tech sovereignty. GreenWaves Technologies, based in Grenoble, builds ultra-low-power processors initially aimed at wireless earbuds and IoT sensors. Yet these same chips – efficient enough to run AI on a coin cell battery – have caught the eye of defense planners. The company’s silicon has attracted investment from France’s Ministry of Armed Forces and partners like Thales, highlighting its dual-use potential. GreenWaves exemplifies how Europe’s push for strategic autonomy can elevate a small deep-tech firm to strategic relevance. Its open-architecture RISC-V processors promise freedom from foreign IP licensing and offer a European alternative to overseas semiconductor suppliers. From smart wearable devices to future battlefield sensors, GreenWaves is positioning itself at the intersection of commercial innovation and continental security needs. Each low-power chip it ships could help reduce Europe’s dependence on imported technologies and fortify the NATO alliance’s technological edge.