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I have written a simple smart contract. I'm running it using rinkeby testnet. But the problem is that any machine can access and see the data. But I need only to send the data to a specific machine( Think of an organization).

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  • I don't exactly know your use-case. you can simply go for a private ethereum net? Commented Jul 14, 2018 at 10:29
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    check out quorum
    – Badr Bellaj
    Commented Jul 15, 2018 at 12:52

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Maybe you should consider to use an Ethereum private network or other permissioned blockchain technologies, e.g. Hyperledger. Indeed, Ethereum (as well as Bitcoin) is a permissionless (i.e. without authentication) blockchain, that means that potentially every machine in the network can access to the data of the smart contract.

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