The breakthrough of blockchain technology has facilitated the emergence and deployment of a wide range of Unmanned Aerial Vehicles (UAV) network-based applications. Yet, the full utilization of these applications is still limited due to the fact that each application is operating on an isolated blockchain. Thus, it is inevitable to orchestrate these blockchain fragments by introducing a cross-blockchain platform that governs the inter-communication and transfer of assets in the UAV networks context. In this paper, we provide an up-to-date survey of blockchain-based UAV networks applications. We also survey the literature on the state-of-the-art cross blockchain frameworks to highlight the latest advances in the field. Based on the outcomes of our survey, we introduce a spectrum of scenarios related to UAV networks that may leverage the potentials of the currently available cross-blockchain solutions. Finally, we identify open issues and potential challenges associated with the application of a cross-blockchain scheme for UAV networks that will hopefully guide future research directions.

翻译：链链技术的突破便利了以无人驾驶航空飞行器(UAV)网络为基础的广泛应用的出现和部署,然而,由于每个应用都在一个孤立的链条上运作,这些应用的充分利用仍然有限,因此,通过引入一个管理无人驾驶航空飞行器网络中资产相互交流和转让的跨块链平台,这些链条碎片的交织是不可避免的。在本文件中,我们提供了对以块链为基础的UAV网络应用的最新调查。我们还调查了最先进的跨链条框架的文献,以突出该领域的最新进展。我们根据调查结果,介绍了与UAV网络有关的一系列情景,这些情景可能利用现有的跨链条解决方案的潜力。最后,我们确定了与应用跨链条计划对UAV网络进行交叉联系的问题和潜在挑战,希望这将指导未来的研究方向。