I am very new to bitcoin so I have very little knowledge on how it works, one of the things i'm trying to understand at the moment is the whole concept of double spending. Assuming I receive a bitcoin payment from someone and only accept it when it gets atleast 3 confirmations and it does, but somehow it gets double spended, what happens to my bitcoin balance? does it turn negative? or does it just become unusable bitcoins that I can't send to anyone else? If i was to use an online wallet like
https://blockchain.info would there be a transaction history where I can view which bitcoin address caused the double-spending attack?
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