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I still won't fall to op's trap if what you said is true. If op really receive that amount of btc and wanted it to return to owner who sent that tip but forgot the username. My suggestion is to donate the money to someone else or donate it to a charity instead of spending it as it is your own money. To tell you honestly, that amount of btc can help a lot of people who really needs help not just me. This may be a trap or just a clickbait and nothing else.
I second that @nakamura12. If this story was indeed true and OP is genuine with his intentions, I am wondering why it took him quite the time to decide to finally send back the mistaken tip. Also, he should be aware that no one actually believes anything impulsively without seeing some receipts or evidences of such subject or event. On top of it all, there is an existing accusation of him about being a notorious scammer through begging for tips kind of techniques. We all should be careful about such things.