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    wChain: A Fast Fault-Tolerant Blockchain Protocol for Multihop Wireless Networks

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    This paper presents wChain\mathit{wChain}, a blockchain protocol specifically designed for multihop wireless networks that deeply integrates wireless communication properties and blockchain technologies under the realistic SINR model. We adopt a hierarchical spanner as the communication backbone to address medium contention and achieve fast data aggregation within O(logNlogΓ)O(\log N\log\Gamma) slots where NN is the network size and Γ\Gamma refers to the ratio of the maximum distance to the minimum distance between any two nodes. Besides, wChain\mathit{wChain} employs data aggregation and reaggregation, and node recovery mechanisms to ensure efficiency, fault tolerance, persistence, and liveness. The worst-case runtime of wChain\mathit{wChain} is upper bounded by O(flogNlogΓ)O(f\log N\log\Gamma), where f=N2f=\lfloor \frac{N}{2} \rfloor is the upper bound of the number of faulty nodes. To validate our design, we conduct both theoretical analysis and simulation studies, and the results only demonstrate the nice properties of wChain\mathit{wChain}, but also point to a vast new space for the exploration of blockchain protocols in wireless networks.Comment: 11 pages, 3 figures; preprin
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