Abstract. This paper considers the tasks of supporting the connectivity of nodes in communication networks of unmanned transport (VANET/MANET-networks). High dynamics, decentralization and absence of hierarchy in the networks of this type actualize the task of supporting the connectivity of nodes with software-configurable security services, providing the network protection. It is offered to use a Blockchain technology based system for VANET/MANET network topologyand authentication data distribution and storage. The issue of unlimited blockchain growth preventing this method from being implemented in VANET/MANET networks is considered. The existing solutions of this issueare analyzed and drawbacks are identified. A notion of blockchain with floating genesis block is introduced and its advantages over similar ideas are demonstrated thus allowing it to be used to resolve the issue of continuously growing blockchain within the systems with stalingtransactions as a whole and in VANET/MANET networks in particular.

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