[Cryptography] handling the "Double Spend Problem" pure cryptography and math (no consensus)

[Andrea Barontini]

Il 16/04/25 20:50, Peter Fairbrother ha scritto:
> Anywhoo, I skimmed to page 54 (of 116) and couldn't see how it solved
> the double-spend problem.
> 
> Could we have that part on a postcard please?
> 
> Hint: Alice has some state on her mobile phone device which allows her
> to convince Bob etc's device that she can/is paying him offline without
> reference to any other devices anywhere. Why can't she clone the state
> and repeat with Charles or Dan or Ellie or Fred's devices...? Note, no
> reference to any other device is allowed until much later.
> 

I'm also really interested about that point in few words, before digging 
deeper

thanks