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Our client-side implementation is open-source and available to anyone at GitHub. You can check the code reliability by yourself. It is licensed under the MIT License, you can integrate our client library without any permission.
The server-side implementation is closed-source currently thus our server may misbehave. However this does not lead any potential security defect because the query is encrypted by a client-side private key. Anything we can do on our server is to create a wrong reply. We cannot know anything from the query if the server-side implementation is malicious. This can be proven mathematically.