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Digital data certi ed by a reputable organization are valuable digital data that can be stored or shared on the internet. However, the problems are: (1) How to ensure the anonymity of organizations on issued certi cates? (2) How to ensure that valuable digital data are securely stored in the system? and (3) How could people verify the reliability of shared data while still ensuring the con dentiality of its content, and how to ensure that the data sharing process is safe, transparent, and fair. Therefore, we propose data producing, data storing, and data sharing schemas. In the data producing schema, we deploy a group signature scheme for a group of reputable organizations that provide the same type of service, an organization in the group generates a valuable digital data from raw data sent from a data owner and then issues a certi cate on the ciphertext of this digital data. In the data storing schema, the data owner uploads his/her data to the public Inter-Planetary File System network and then stores the access address of the stored data and the corresponding certi cate on the blockchain ledger. In the data sharing schema, everyone on the system could verify the reliability of shared data before sending a data sharing request to the data owner. The data sharing process is performed via a smart contract, and involved parties have to escrow to encourage honesty. The schemas of data storing and sharing guarantee the security properties including con dentiality, integrity, privacy, non-repudiation, and anonymity.INDEX TERMS Blockchain, IPFS, data storing, data sharing.

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We describe a framework to exploit social network connections for targeted campaigns delivery in order to support local retailers in enhancing customer communication. In order to demonstrate its feasibility we implemented a client application enabling end users to find relevant coupons and offers and retrieve them after completing specific tasks. By integrating this application into a server infrastructure for retailers to manage their offers and allowing offers to be shared among end users via social networks, we are able to considerably augment the success of marketing campaigns. As a result, brand awareness and loyalty as well as customer satisfaction may be greatly enhanced.