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The way I pronounce the word “sorry” as well as my inflection whenever I’m speaking. Only my close friends whom I speak to in private know what my voice sounds like.
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There are words I’ve made up that I jokingly use around friends. An impostor would not know about this as I speak to my friends privately and I never join chat servers, where bad actors could be eavesdropping. A wrong answer or “I don’t know” would out them as an impostor.
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My art. I will deliberately make “mistakes” in my art that are subtle enough to not be seen by most people, but I will be able to tell if someone is trying to copy it. Map makers do something similar.
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Other random details only my friends know about that’d immediately out an impostor once asked.
I didn’t know about that but that was interesting to read about and now I know what it’s called, thank you! 😃