Optimal use of scarce radio spectrum is essential in the proliferation of beyond 5G networks, and promising blockchain technology offers various benefits for the spectrum management. However, existing blockchain-based solutions are expensive, non-optimized, and lack spectrum fraud detection. This paper proposes a novel consensus mechanism for a blockchain-based Dynamic Spectrum Access (DSA) system. The proposed "Proof-of-Sense" consensus mechanism operates based on spectrum sensing procedures rather than cryptographic calculations. It is specially designed to address fraudulent/unauthorized access to the spectrum by analyzing the sensed spectrum data. The core of the consensus mechanism is a cryptographic key sharing mechanism inspired by Shamir's secret sharing scheme. Moreover, the proposed DSA system can enable different micro-services such as automated spectrum auctions, payment and penalty handling, and spectrum fraud detection. A proof-of-concept based on experimental approaches coupled with Matlab simulations is presented to analyze the performance of the proposed consensus mechanism.
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