From c3f48359e6c00a22b8f0d8562ecbf62195af362a Mon Sep 17 00:00:00 2001
From: Daira Hopwood <daira@jacaranda.org>
Date: Thu, 20 May 2021 22:23:19 +0100
Subject: [PATCH] Clarify that v4 transactions continue to use the ZIP 243
 SIGHASH algorithm after NU5 activation. fixes #510

Signed-off-by: Daira Hopwood <daira@jacaranda.org>
---
 protocol/protocol.tex | 19 ++++++++++++++++---
 1 file changed, 16 insertions(+), 3 deletions(-)

diff --git a/protocol/protocol.tex b/protocol/protocol.tex
index ad77f189..0787ff55 100644
--- a/protocol/protocol.tex
+++ b/protocol/protocol.tex
@@ -5946,9 +5946,10 @@ for \Sapling, but using the \Heartwood \consensusBranchID \hexint{F5B9230B} as d
 for \Sapling, but using the \Canopy \consensusBranchID \hexint{E9FF75A6} as defined in
 \cite{ZIP-251}.}
 
-\nufiveonward{The \sighashAlgorithm used after activation of the \NUFive \networkUpgrade,
-for both version 4 and version 5 \transactions, is defined in \cite{ZIP-244} as modified
-by \cite{ZIP-225}. It will use a new \consensusBranchID \hexint{F919A198} as defined in
+\nufiveonward{The \sighashAlgorithm used for version 5 \transactions introduced by the
+\NUFive \networkUpgrade is defined in \cite{ZIP-244}. Version 4 \transactions continue
+to use the \sighashAlgorithm defined in \cite{ZIP-243}. After \NUFive activation, both
+\transaction versions use the \NUFive \consensusBranchID \hexint{F919A198} as defined in
 \cite{ZIP-252}.}
 
 
@@ -14331,6 +14332,18 @@ Peter Newell's illustration of the Jubjub bird, from \cite{Carroll1902}.
 \lsection{Change History}{changehistory}
 
 
+\historyentry{2021.2.2}{2021-05-20}
+\begin{itemize}
+\nufive{
+    \item Clarify in \crossref{sighash} that v4 \transactions continue to use the
+          \cite{ZIP-243} \sighashAlgorithm after \NUFive activation.
+} %nufive
+\notnufive{
+    \item No changes before \NUFive.
+} %notnufive
+\end{itemize}
+
+
 \historyentry{2021.2.1}{2021-05-20}
 \begin{itemize}
 \nufive{