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Well, it's part of the beauty of the Blockchain Technology. The technology and code it takes to make the blockchain work keeps everything open and transparent.

So, there is really nothing secret or hidden in the code or on the Hive blockchain. There isn't a mechanism to block or remove users from seeing what data is recorded on the blockchain interactions.

So, muting this user is really the only thing close to removing them from your experience on Hive. However, unless they mute you there is no control over their experience on Hive.