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*To*: [email protected]*Subject*: Is the following digicash protocol possible?*From*: [email protected] (James A. Donald)*Date*: Thu, 1 Sep 1994 14:15:19 -0700 (PDT)*Sender*: [email protected]

A question about offline digicash: Is it possible to arrange digicash as follows: If A, the original issuer, issues a unit of digicash to to B, and B gives it to C, and C gives it to D, and D, gives it to E, and E cashes it with A, -- and everyone colludes except C and D, it is impossible to prove that C got this unit from D. If A, the original issuer, issus a unit of digicash to to B, and B gives it to C, and C gives it to D, and D, gives it to E, and E cashes it with A, -- and C double spends it to D', who then gives it to E' who then attempts to cash it with A, -- then A will detect the double spending and rebuff the attempt, E' will complain to D', and D', with information supplied by E' and A, can then prove that C dishonorably double spent the money, without discovering that C gave the money to D, and hence without discovering that D gave the money to E. -- --------------------------------------------------------------------- We have the right to defend ourselves and our property, because of the kind of animals that we James A. Donald are. True law derives from this right, not from the arbitrary power of the omnipotent state. [email protected]

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