Abstract. Advertisement dissemination is a promising M-commerce application which exploits the capabilities of mobile ad hoc networks to increase the visibility of the products being offered by merchants. The starting point is a merchant who generates an advertisement that is subsequently disseminated by citizens who carry mobile devices acting as network nodes. In this paper we present a novel system where users collaborating in offer dissemination are incentivized with e-coin rewards. Our system is proven to be secure and to preserve the privacy of nodes.