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If more people realise that decentralized systems isn't like a banking or centralized system were you can go and report a transaction and they seize the persons money or track the person( although its possible if they are not smart enough) then you would be more careful when doing deals here.
Absolutely. Bitcoin transaction cannot be undone. I would like to draw attention to the virus that has caused a lot of losses recently. It infects you computer and does nothing except it waits until you make a transaction and it changes the address you just copied to another one. Please, guys, double check what you are pasting.