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Make payment addresses extensible. fixes #1344 

Signed-off-by: Daira Hopwood <daira@jacaranda.org>
This commit is contained in:
Daira Hopwood 2016-09-07 16:08:51 +01:00
parent b000393347
commit 20bb18f9e7
1 changed files with 14 additions and 1 deletions
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15
protocol/protocol.tex
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@ -2283,7 +2283,7 @@ $\AuthPublic$ is a $\SHAName$ output.
$\TransmitPublic$ is a \changed{Bern2006} public key, for use with the
encryption scheme defined in \crossref{inband}.
The raw encoding of a \paymentAddress consists of:
The raw encoding of a \paymentAddress starts with:
\begin{equation*}
\begin{bytefield}[bitwidth=0.07em]{520}
@ -2308,6 +2308,12 @@ The raw encoding of a \paymentAddress consists of:
normal encoding of a Curve25519 public key \cite{Bern2006}}.
\end{itemize}
To allow for future extensions, when reading the raw encoding, up to 66
additional bytes after the fields defined above \MUST be accepted and stored
with the address, but otherwise ignored. In this version of the protocol there
is no defined meaning for these additional bytes, and so they \MUST be omitted
when an address is generated.
\nsubsubsection{Spending Keys}
A \spendingKey consists of $\AuthPrivate$, which is a sequence of \changed{252} bits.
@ -3276,6 +3282,13 @@ The errors in the proof of Ledger Indistinguishability mentioned in
\nsection{Change history}
\subparagraph{2016.0-beta-1.2}
\begin{itemize}
\item Allow up to 66 ignored but retained bytes after the raw encoding
of a payment address, to support extensibility.
\end{itemize}
\subparagraph{2016.0-beta-1.1}
\begin{itemize}