Question about bitcoin

I have been seeing lately something about btc flash. Where one buys a 'fake' btc and it stays in the wallet and is transferable. Is this possible? Do such things exist? If they do how can one protect themselves against such when receiving btc as payment?Thanks.

submitted by /u/gachengomarugu
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source https://www.reddit.com/r/btc/comments/pls0fu/question_about_bitcoin/

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