Sentry is an an app developed by Hala Systems that has been providing civilians with a crowdsourced and sensor-driven early warning system against airstrikes during the protracted civil war in Syria.
Live since 2016, the system has evolved to become more accurate and complex, using a sensor network, artificial intelligence and blockchain technology to provide a strong, technological underpinning for analyzing data on the ground and distributing critical alerts. Sentry now issues an average of 140 early warnings each day, giving citizens between seven and 10 minutes’ advance notice of potential dangers.
The data inputs for the warning system include individuals’ observations and reports, like sightings of overhead aircraft, and sensor modules placed in trees or on rooftops, which collect acoustic data for analysis. In addition to this, neural network systems trawl local social media for keywords that can provide further clues as to the timing and locations of possible attacks.
Until now, Sentry has used the Ethereum blockchain to