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The popularity of smartphones has led to the growth of mobile app markets,creating a need for enhanced transparency, global access, and securedownloading. This paper introduces AGChain, a blockchain-based gateway thatenables trustworthy app delegation within existing markets. AGChain ensuresthat markets can continue providing services while users benefit frompermanent, distributed, and secure app delegation. During its development, weaddress two key challenges: significantly reducing smart contract gas costs andenabling fully distributed IPFS-based file storage. Additionally, we tacklethree system issues related to security and sustainability. We have implementeda prototype of AGChain on Ethereum and Polygon blockchains, achieving effectivesecurity and decentralization with a minimal gas cost of around 0.002 USD perapp upload (no cost for app download). The system also exhibits reasonableperformance with an average overhead of 12%.

AGChain: A Blockchain-based Gateway for Trustworthy App Delegation from Mobile App Markets