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Question about safely storing DApp user's sensitive information

Hi, I'm new to blockchain development, I want to build a Dapp that allows users to store their sensitive information which only they can access. I saw [this article](https://medium.com/coinmonks/how-to-secure-messages-on-eos-ebb869a459ea) but I don't like storing that information (encrypted or not) on-chain on a table that will grow quite large. I want to know if EOS has functionality such as "user account api" where they can store their own information and then have my Dapp consume their account api? Or something like that... if that makes sense?
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