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Cognitive radio networks allow opportunistic spectrum access to the unlicensed users, which rely on effective spectrum sensing. Recently, cooperative sensing has been found to improve sensing reliability. However, sometimes the selfish users do not cooperate, and therefore, different incentive design mechanisms like contract theory have been proposed recently, where the cooperation is encouraged by offering appropriate reward to the sensing participants. However, still no secure structure exists for the reward distribution after a successful contract completion, and a user may also deny sensing even after accepting the contract. This work proposes the use of blockchain-based smart contracts, which are based upon a permissioned blockchain that helps in making the transactions private among the participants. Further, the efficiency of this approach is improved by introducing a reputation parameter for the users …