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very much thanks arthur for the introduction this is c-star its joint work with my colleagues from idiot zurich benjamin roger and martin so to start remember that on public blockchain smart contracts interact with data which is stored in clear text on the blockchain which is accessible to everyone so if you want to store sensitive information such as your medical data this is of course a problem right and ideally you would have something like this where the data is hidden and you can now interact with your data as before using your smart contracts and note that this concept of data privacy does not protect the smart contact itself but only the data which is stored this is not a new idea several works have tried to achieve data privacy but they have various limitations some of the early works they bring privacy to payments mostly but they do not focus on general smart contracts some works rely on trusted managers or hardware to enable data privacy but if you do not want to trust thes