Evidence is abundant. It would be immediately obvious if someone pulled off a 51% attack, because somehow service would be tangibly disrupted. That's the definition of a 51% attack. Otherwise it's just mining as usual.
If I had 51% of the Bitcoin network, I could break it.
No, you can't. You can prevent transactions from going through, double spend, and cause mischief in a few other ways, but you can't steal other people's Bitcoins or anything of that magnitude.
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Evidence is abundant. It would be immediately obvious if someone pulled off a 51% attack, because somehow service would be tangibly disrupted. That's the definition of a 51% attack. Otherwise it's just mining as usual.
No, you can't. You can prevent transactions from going through, double spend, and cause mischief in a few other ways, but you can't steal other people's Bitcoins or anything of that magnitude.