spotting a real trader

With 95% of traders lying about their performance and claiming to be profitable, how can one spot a real trader from the crowd? I mean literally if you were to meet a real trader what are the things he/she will do to make you know they may be real traders?

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@randolf_mercer - 19 hours ago

For me real traders don't give assurances, once you hear a trader say his strategy yields a sure 80% return just know he is lying. In the investment world it is forbidden to use the word "guarantee"