Memo field fixes.

Signed-off-by: Daira Hopwood <daira@jacaranda.org>

protocol/protocol.tex

@@ -721,10 +721,11 @@ and produces `z' as the Base58Check leading character.}
 Transmitted coins are stored on the blockchain in encrypted form, together with
 a \coinCommitment $\cm$.
 
-A \coinsCiphertext is an encryption of a \coinPlaintext to a
-\transmitPublicAlgorithm key $\TransmitPublic$.
+The \coinPlaintexts associated with a \PourDescription are encrypted to the
+respective \transmitPublicAlgorithm keys $\TransmitPublicNew{1..\NNew}$, and the
+result forms a \coinsCiphertext.
 
-A \coinPlaintext consists of $(\Value, \CoinAddressRand, \CoinCommitRand, \Memo)$,
+Each \coinPlaintext consists of $(\Value, \CoinAddressRand, \CoinCommitRand, \Memo)$,
 where:
 
 \begin{itemize}
@@ -752,11 +753,12 @@ does not use it.
 The raw encoding of a \coinPlaintext consists of, in order:
 
 \begin{equation*}
-\begin{bytefield}[bitwidth=0.05em]{712}
-    \bitbox{64}{$\TransmitPlaintextVersionByte$} &
-    \bitbox{120}{$\Value$ (8 bytes)} &
+\begin{bytefield}[bitwidth=0.035em]{1224}
+    \bitbox{80}{$\TransmitPlaintextVersionByte$} &
+    \bitbox{144}{$\Value$ (8 bytes)} &
     \bitbox{256}{$\CoinAddressRand$ (32 bytes)} &
     \bitbox{384}{$\CoinCommitRand$ (48 bytes)} &
+    \bitbox{512}{$\Memo$ (64 bytes)}
 \end{bytefield}
 \end{equation*}
 
@@ -766,6 +768,7 @@ encoding of a \coinPlaintext.
     \item 8 bytes specifying a big-endian encoding of $\Value$.
     \item 32 bytes specifying $\CoinAddressRand$.
     \item 48 bytes specifying $\CoinCommitRand$.
+    \item 64 bytes specifying $\Memo$.
 \end{itemize}
 
 \section{Pours (within a transaction on the blockchain)}