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Is the information in this message sufficient to uniquely identify me for all future correspondences?

Is there a better of doing this?

Rules of the game:
1. This first message is trusted to be from me.
2. In all subsequent messages I only sign them with my digital signature.

To me, this seems secure, but I may have overlooked something.

I apologize if this has been asked and answered before. I did a search but could not find anything.

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