  Blockchain (BC) technology can revolutionize the future of communications by
enabling decentralized and open sharing networks. In this paper, we propose the
application of BC to facilitate Mobile Network Operators (MNOs) and other
players such as Verticals or Over-The-Top (OTT) service providers to exchange
Radio Access Network (RAN) resources (e.g., infrastructure, spectrum) in a
secure, flexible and autonomous manner. In particular, we propose a BC-enabled
reverse auction mechanism for RAN sharing and dynamic users' service provision
in Beyond 5G networks, and we analyze its potential advantages with respect to
current service provisioning and RAN sharing schemes. Moreover, we study the
delay and overheads incurred by the BC in the whole process, when running over
both wireless and wired interfaces.
