[rocqua]

Fake transactions take more than a 50% attack to execute. Because the transactions simply do not come with the required signatures.

For rolling back transactions, a 50% attack actually convinces the remaining honest nodes. For invalid transactions, even if you have 90% of the network, the remaining 10% of honest nodes will not follow the wrong chain.

This means anyone could detect this happening. At which point faith in eth will plummet, and so will prizes.