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The smart city is an emerging notion that is leveraging the Internet ofThings (IoT) technique to achieve more comfortable, smart and controllablecities. The communications crossing domains between smart cities isindispensable to enhance collaborations. However, crossing-domaincommunications are more vulnerable since there are in different domains.Moreover, there are huge different devices with different computationcapabilities, from sensors to the cloud servers. In this paper, we propose alightweight two-layer blockchain mechanism for reliable crossing-domaincommunication in smart cities. Our mechanism provides a reliable communicationmechanism for data sharing and communication between smart cities. We defined atwo-layer blockchain structure for the communications inner and between smartcities to achieve reliable communications. We present a new block structure forthe lightweight IoT devices. Moreover, we present a reputation-basedmulti-weight consensus protocol in order to achieve efficient communicationwhile resistant to the nodes collusion attack for the proposed blockchainsystem. We also conduct a secure analysis to demonstrate the security of theproposed scheme. Finally, performance evaluation shows that our scheme isefficient and practical.

A lightweight two-layer blockchain mechanism for reliable crossing-domain communication in smart cities