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A Smart Contract records messages related to a given user (wallet). Messages can only be read by the recipient (Blockchain ensures that only the recipient wallet has access to this information). Through a mobile/web interface a user with an Ethereum wallet will be able to read and write messages onto the Smart Contract, achieving this way a full DApp. This same idea can be extended to guaranteed delivery messaging systems, in such a way to make it possible to audit whether a given message has been really sent and read by its recipient or not. Maybe Smart Cities are going to need a mechanism to make secure in a decentralized fashion the transfer of messages among officials or even citizens. Source code available at https://gitlab.com/lemonandmarket/com.whatschain/tree/master Pitch Video at https://www.youtube.com/watch?v=TH9Qha2Figw

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