ralexstokes

Do you have an estimate for how expensive the attack will be?

Are you renting hardware from the cloud?

Any chance they will hardfork before you can attack?

You generally get around the "nothing at stake" problem by requiring validators (consensus-forming nodes) to submit a deposit that is subject to deletion upon proof of bad behavior. For example, if I get two conflicting messages signed by you in Ethereum's Casper network, I can present that data as proof to the Casper smart contract where you lose your deposit.