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Wording improvements for the effect of upgrades on sighash. 

Signed-off-by: Daira Hopwood <daira@jacaranda.org>
This commit is contained in:
Daira Hopwood 2018-07-18 10:01:09 +01:00
parent c2b8ba2052
commit 71617341c9
1 changed files with 3 additions and 4 deletions
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7
protocol/protocol.tex
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@ -4249,7 +4249,7 @@ about the \transaction and (where applicable) the specific input, to give a
authorization differs between
\sprout{\transparentInputs and inputs to \Sprout \joinSplitTransfers,}
\notsprout{\transparentInputs, inputs to \Sprout \joinSplitTransfers,\sapling{ and \Sapling \spendTransfers,}}
but the same \sighashTxHash algorithm is used.
but (for a given \transactionVersion) the same \sighashTxHash algorithm is used.
In the case of \Zcash, the
\sprout{$\PHGR$ proving system used is}%
@ -4275,9 +4275,8 @@ of the \transaction.}
\changed{In \Zcash, all \sighashTypes are extended to cover the \Zcash-specific
fields $\nJoinSplit$, $\vJoinSplit$, and if present $\joinSplitPubKey$. These fields
are described in \crossref{txnencoding}. The hash \emph{does not} cover the field $\joinSplitSig$.}
\overwinter{
After \Overwinter\sapling{ and \Sapling} activation, all \sighashTypes are also extended to cover
\transaction fields introduced in those upgrades.
\overwinter{After \Overwinter activation, all \sighashTypes are also extended to cover \transaction fields
introduced in that upgrade\sapling{, and similarly after \Sapling activation}.
The original \sighash algorithm defined by \Bitcoin suffered from some deficiencies as
described in \cite{ZIP-143}; in \Zcash these are to be addressed by changing this algorithm