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-rw-r--r--doc/system/taler/implementation.tex26
1 files changed, 16 insertions, 10 deletions
diff --git a/doc/system/taler/implementation.tex b/doc/system/taler/implementation.tex
index 4bed97fd..973e9789 100644
--- a/doc/system/taler/implementation.tex
+++ b/doc/system/taler/implementation.tex
@@ -1056,23 +1056,29 @@ auditor.
The list of invariants checked by this tool thus includes:
\begin{itemize}
-\item emergency on denominations because the value or number
+\item Testing for an
+ emergency on denominations because the value or number
of coins deposited exceeds the value or number of coins
issued; if this happens, the exchange should revoke the
respective denomination.
-\item various arithmetic inconsistencies from exchanges
+\item Checking for arithmetic inconsistencies from exchanges
not properly calculating balances or fees during the
various coin operations (withdraw, deposit, melt, refund);
-\item signatures being wrong for denomination key revocation,
- coin denomination signature,
- or coin operations (deposit, melt, refund, recoup)
-\item denomination keys not being known to the auditor
-\item denomination keys being actually revoked if a recoup
- is granted
-\item coins being melted but not (yet) recouped
+\item That signatures are correct for denomination key revocation,
+ coin denominations,
+ and coin operations (deposit, melt, refund, recoup)
+\item That denomination keys are known to the auditor.
+\item That denomination keys were actually revoked if a recoup
+ is granted.
+\item Whether there exists refresh sessions from coins that
+ have been melted but not (yet) revealed
(this can be harmless and no fault of the exchange, but
could also be indicative of an exchange failing to process
- certain requests in a timely fashion)
+ certain requests in a timely fashion).
+\item That the refund deadline is not after
+ the wire deadline (while harmless, such a deposit
+ makes inconsistent requirements and should have been
+ rejected by the exchange).
\end{itemize}