Interesting article on this topic: https://blog.coinbase.com/how-coinbase-views-proof-of-work-security-f4ba1a139da0 https://blog.coinbase.com/how-coinbase-view

Interesting article on this topic: https://blog.coinbase.com/how-coinbase-views-proof-of-work-security-f4ba1a139da0 https://blog.coinbase.com/how-coinbase-views-proof-of-work-s... Also, Ethereum is transitioning to proof of stake which will make attacks much more expensive because an attacker must acquire large amounts of ETH for each attack.