When it comes to confidentiality and data integrity, in traditional systems users always need to trust central authorities. The arrival of first crypto-currencies and the rapid increase in use of blockchains on non-financial areas opens the possibility of a new approach to solving this problem. In this work, we propose a new way of providing confidentiality and data integrity based on blockchain, which does not require a trusted central authority. We gradually develop an idea of solution and then make a proof of concept by implementing the proposed solution. Considering the limitations of the implemented solution we also evaluate where the integration of implemented solution might be reasonable.
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