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attempt to clarify double spending

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Christian Grothoff 2015-09-28 08:53:01 +02:00
parent bf8b9d1435
commit 3f0a0c8f71
1 changed files with 4 additions and 2 deletions
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doc/paper/taler.tex
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@ -745,7 +745,8 @@ $\widetilde{C} := S_K(C_p)$:
only to the mint. only to the mint.
\item The mint validates $\mathcal{D}$ and checks for double spending. \item The mint validates $\mathcal{D}$ and checks for double spending.
If the coin has been involved in previous transactions, it sends an error If the coin has been involved in previous transactions and the new
one would exceed its remaining value, it sends an error
with the records from the previous transactions back to the merchant. with the records from the previous transactions back to the merchant.
% %
If double spending is not found, the mint commits $\langle \mathcal{D} \rangle$ to disk If double spending is not found, the mint commits $\langle \mathcal{D} \rangle$ to disk
@ -1113,7 +1114,8 @@ an exclusive right to redeem deposit permissions for the coin for a
limited duration. The merchant uses the lock permission to determine limited duration. The merchant uses the lock permission to determine
if the coin has already been spent and to ensure that it cannot be if the coin has already been spent and to ensure that it cannot be
spent by another merchant for the {\em duration} of the lock as spent by another merchant for the {\em duration} of the lock as
specified in the lock permission. If the coin has been spent or is specified in the lock permission. If the coin has insufficient funds
because too much has been spent or is
already locked, the mint provides the owner's deposit or locking already locked, the mint provides the owner's deposit or locking
request and signature to prove the attempted fraud by the customer. request and signature to prove the attempted fraud by the customer.
Otherwise, the mint locks the coin for the expected duration of the Otherwise, the mint locks the coin for the expected duration of the