Blockchain has shown a great potential in Internetof Things (IoT) ecosystems for establishing trust and consensusmechanisms without involvement of any third party. Understandingthe relationship between communication and blockchain aswell as the performance constraints posing on the counterpartscan facilitate designing a dedicated blockchain-enabled IoTsystems. In this paper, we establish an analytical model for theblockchain-enabled wireless IoT system. By considering spatiotemporaldomain Poisson distribution, i.e., node geographicaldistribution in spatial domain and transaction arrival rate intime domain are both modeled as Poisson point process (PPP),we first derive the distribution of signal-to-interference-plus-noiseratio (SINR), blockchain transaction transmission successful rateas well as overall throughput. Based on the system model andperformance analysis, we design an algorithm to determine theoptimal full function node deployment for blockchain system underthe criterion of maximizing transaction throughput. Finallythe security performance is analyzed in the proposed networkswith three typical attacks. Solutions such as physical layersecurity are presented and discussed to keep the system secureunder these attacks. Numerical results validate the accuracy ofour theoretical analysis and optimal node deployment algorithm.
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