  This paper presents $\mathit{wChain}$, 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 $O(\log
N\log\Gamma)$ slots where $N$ is the network size and $\Gamma$ refers to the
ratio of the maximum distance to the minimum distance between any two nodes.
Besides, $\mathit{wChain}$ employs data aggregation and reaggregation, and node
recovery mechanisms to ensure efficiency, fault tolerance, persistence, and
liveness. The worst-case runtime of $\mathit{wChain}$ is upper bounded by
$O(f\log N\log\Gamma)$, where $f=\lfloor \frac{N}{2} \rfloor$ 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 $\mathit{wChain}$, but also point to a vast new space
for the exploration of blockchain protocols in wireless networks.
