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You have to continue executing the 51% attack forever, or else when you stop, the network goes back to normal. And about the worst thing you can do during such

You have to continue executing the 51% attack forever, or else when you stop, the network goes back to normal. And about the worst thing you can do during such an attack is prevent transactions from confirming. You can't unilaterally rewrite the ledger, you can't steal money from people. So saying you "own the network" while executing such an attack is... pretty dumb.

sgjohnson 4y ago
> And about the worst thing you can do during such an attack is prevent transactions from confirming. You can also double, triple or quadripule spend bitcoins and have those transactions confirm. Yes, they’ll get marked as double spends, along with everything down that chain, but that’ll only happen once the network goes back to normal, and it would absolutely wreak havoc. So no, it’s not just “all you can do is a denial of service”.