> 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 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”.