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Blockchains enables tamper-proof, ordered logging for transactional data in adecentralized manner over open-access, overlay peer-to-peer networks. In thispaper, we propose a decentralized framework of proactive caching in ahierarchical wireless network based on blockchains. We employ theblockchain-based smart contracts to construct an autonomous content cachingmarket. In the market, the cache helpers are able to autonomously adapt theircaching strategies according to the market statistics obtained from theblockchain, and the truthfulness of trustless nodes are financially enforced bysmart contract terms. Further, we propose an incentive-compatible consensusmechanism based on proof-of-stake to financially encourage the cache helpers tostay active in service. We model the interaction between the cache helpers andthe content providers as a Chinese restaurant game. Based on the theoreticalanalysis regarding the Nash equilibrium of the game, we propose a decentralizedstrategy-searching algorithm using sequential best response. The simulationresults demonstrate both the efficiency and reliability of the proposedequilibrium searching algorithm.

Decentralized Caching for Content Delivery Based on Blockchain: A Game Theoretic Perspective