Re: Bitcoin can be hacked?

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If somebody will get 51% of hashrate then technologically also possible. You can also learn about all bitcoin weaknesses from http://en.bitcoinwiki.org/Bitcoin_weaknesses

I saw about this discussion on youtube that it might happen when bitcoin miner double spends the money and they started make another transaction then trying to confirm it - but however I believe this could be prevented if payment recipient makes sure the transaction gets confirmed more than 6 times.