You are really complicated… 
So let’s call it “User ID”.
Or if you like “Kontalk ID”.
In Play store we use:
“Your phone number is your ID.”
Ok, then what about
Your [link]hashed[/link] phone number is your Kontalk ID and publicly visible throughout the network.
?
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Great. 
I think that’s perfect and understandable for non tech users like me.
Thank you
OK, finally, added and translated into german.
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