The error concerning nTime in the Bitcoin Developer Reference has been corrected.

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

protocol/protocol.tex

@@ -3238,9 +3238,9 @@ The changes relative to \Bitcoin version 4 blocks as described in \cite{Bitcoin-
         could test several distinct encodings of each Equihash solution against the difficulty
         filter, rather than only the single intended encoding.
   \item As in \Bitcoin, the $\nTimeField$ field \MUST represent a time \emph{strictly greater than}
-        the median of the timestamps of the past $\PoWMedianBlockSpan$ \blocks; not greater
-        than or equal to. At the time of writing, the Bitcoin Developer Reference \cite{Bitcoin-Block}
-        is in error on this point.
+        the median of the timestamps of the past $\PoWMedianBlockSpan$ \blocks. The
+        Bitcoin Developer Reference \cite{Bitcoin-Block} was previously in error on this point,
+        but has now been corrected.
 \end{pnotes}
 
 \nsubsection{Proof of Work}

protocol/zcash.bib

@@ -271,7 +271,7 @@ Received \mbox{April 13,} 2011.}
 @misc{Bitcoin-Block,
    title={Block {H}eaders --- {B}itcoin {D}eveloper {R}eference},
    url={https://bitcoin.org/en/developer-reference#block-headers},
-   urldate={2016-08-08}
+   urldate={2017-04-25}
 }
 
 @misc{Bitcoin-nBits,