For smaller-scale blockchains you would probably adopt a non-proof-of-work consensus mechanism. (This is probably what you want, anyway, when the value of the

For smaller-scale blockchains you would probably adopt a non-proof-of-work consensus mechanism. (This is probably what you want, anyway, when the value of the assets that back the network exceeds the value of mounting an attack! You might argue againt the wisdom of having the network secured by general mutual mistrust, but it's no worse than relying on cost.)