The article proposes new forms of participation and financing of public works that ensure the involvement of the population thanks to the solutions made possible by blockchain. The contribution starts from the consideration that the financing of public initiatives affects administrations and citizens closely, both as users and as taxpayers. The city is thus understood as an innovation laboratory, where virtuous solutions can be experimented and implemented while maintaining a close connection to the population. To this end, concrete solutions are proposed for innovative, traceable and sustainable financing of public infrastructures, activated with the new tools developed on blockchain technology.