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I do want to point out that it is possible to use a central server while keeping metadata private if you use noise

How do you mean? Could you link to where you could find that? Because I searched for 'metadata' in the Noise Protocol repository and came up with nothing (https://github.com/noiseprotocol/noise_wiki/search?q=metadat...) N.b. I am very much an amateur and am fascinated by private communication methods

The Noise Protocol is a specific project, that, funnily enough, doesn’t include generating noise. I believe the name is intended to mean that the messages look like noise.

Here are some protocols that use noise (specifically differentially private noise):

https://vuvuzela.io/research

https://people.csail.mit.edu/nickolai/papers/tyagi-stadium-e...

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