AFAIK Ethereum plans to resolve this "nothing at stake" issue by using security deposits. If someone submits a proof that a miner was staking on multiple chains

AFAIK Ethereum plans to resolve this "nothing at stake" issue by using security deposits. If someone submits a proof that a miner was staking on multiple chains, the miner loses their security deposit. https://github.com/ethereum/wiki/wiki/Proof-of-Stake-FAQ https://github.com/ethereum/wiki/wiki/Proof-of-Stake-FAQ That said, this all looks hard to get right...