Abstract
The widespread use of online social networks has resulted in a surge in photo sharing, but the vulnerability of photo privacy becomes apparent when these images are disseminated across multiple platforms. Current solutions often fall short in delivering efficient social network services without compromising user privacy. Introducing PhotoChain, a revolutionary blockchain-based framework designed to facilitate secure photo sharing across social networks. This framework incorporates advanced features, including dissemination control, face masking, photo integrity verification, access control, and dynamic privacy policy generation. Leveraging smart contracts, PhotoChain ensures a consistent consensus on dissemination control, while robust mechanisms for photo ownership identification are integrated to thwart illegal reprinting. A fully functional prototype has been implemented and rigorously tested, substantiating the framework's prowess in delivering security, efficacy, and efficiency for photo sharing across social networks. Keywords: Online social networks, PhotoChain, blockchain
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