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In the past few years, cosmic-rays beyond the GZK cut-off ($E > 5 \times10^{19}$ eV) have been detected by leading collaborations such as Pierre AugerObservatory. Such observations raise many questions as to how such energies canbe reached and what source can possibly produce them. Although at lowerenergies, mechanisms such as Fermi acceleration in supernovae front shocks seemto be favored, top-down scenarios have been proposed to explain the existenceof ultra-high energy cosmic-rays: the decay of super-massive long-livedparticles produced in the early Universe may yield to a flux of ultra-highenergy photons. Such photons might be presently generating so calledsuper-preshowers, an extended cosmic-ray shower with a spatial distributionthat can be as wide as the Earth diameter. The Cosmic Ray Extremely DistributedObservatory (CREDO) mission is to find such events by means of a network ofdetectors spread around the globe. CREDO's strategy is to connect existingdetectors and create a worldwide network of cosmic-ray observatories. Moreover,citizen-science constitutes an important pillar of our approach. By helping ouralgorithms to recognize detection patterns and by using smartphones asindividual cosmic-ray detectors, non-scientists can participate in scientificdiscoveries and help unravel some of the deepest mysteries in physics.

Cosmic Ray Extremely Distributed Observatory: a global network of detectors to probe contemporary physics mysteries