I did a ton of reading earlier and I'm not sure what part has to be centralized. I'm not disbelieving you but just don't know which part it might be...
https://robertheaton.com/otr3. How would you go about verifying identity and maintain deniability?
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You can use ephemeral keys on the client and gift wrap messages. All a third party would see is that a key (that doesn’t have any other connected data) sent a dm to you.
The ephemeral keys only have to last a single message at a time.
