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 A hierarchy structure could work, with “master” and “sub-accounts”. 
 But then you can't throw away the "master" 
 Wouldnt need to would you? The subs would be the throw aways. 
 Being able to lose a key and needing to throw a key away are effectively the same thing.  Without having keys that are impossible to lose, the idea is that we should treat all keys as a throwaway entity in our designs. 
 “…we should treat all keys as a throwaway entity in our designs.”

Yes