One very interesting difficulty for these guys is going to be deciding on mining, weighing costs and benefits and threat models.. Ethereum's current mining rat

One very interesting difficulty for these guys is going to be deciding on mining, weighing costs and benefits and threat models.. Ethereum's current mining rates look like they would take a few thousand GPUs to fork the chain. Bitcoin's costs would be in the $hundred million+ range for a secret attack. Edit: Most alt-mining proposals for enterprises do away with any ability to cost out mining attack vectors at all with some sort of trusted server, keys, etc.