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Protocol spec: index improvements. 

Signed-off-by: Daira Hopwood <daira@jacaranda.org>
This commit is contained in:
Daira Hopwood 2019-07-29 16:46:13 +01:00
parent fbacfdc358
commit 7ea6510a05
1 changed files with 12 additions and 10 deletions
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22
protocol/protocol.tex
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@ -736,7 +736,7 @@ electronic commerce and payment, financial privacy, proof of work, zero knowledg
\newcommand{\statement}{\term{statement}}
\newcommand{\statements}{\terms{statement}}
\newcommand{\ZkSNARKStatements}{\titleterm{Zk-SNARK Statement}\notsprout{s}}
\newcommand{\zkProof}{\term{zk proof}}
\newcommand{\zkProof}{\termandindex{zk proof}{zero-knowledge proof}}
\newcommand{\zeroKnowledgeProof}{\term{zero-knowledge proof}}
\newcommand{\zeroKnowledgeProofs}{\terms{zero-knowledge proof}}
\newcommand{\proofNonmalleability}{\termandindex{nonmalleability}{nonmalleability (of proofs)}}
@ -832,7 +832,8 @@ electronic commerce and payment, financial privacy, proof of work, zero knowledg
\newcommand{\blockVersionNumber}{\term{block version number}}
\newcommand{\blockVersionNumbers}{\terms{block version number}}
\newcommand{\Blockversions}{\termandindex{Block versions}{block version number}}
\newcommand{\blockTime}{\term{block time}}
\newcommand{\blockTargetSpacing}{\term{block target spacing}}
\newcommand{\blockTimestamp}{\term{block timestamp}}
\newcommand{\blockHeight}{\term{block height}}
\newcommand{\blockHeights}{\terms{block height}}
\newcommand{\activationHeight}{\term{activation block height}}
@ -880,8 +881,8 @@ electronic commerce and payment, financial privacy, proof of work, zero knowledg
\newcommand{\bestValidBlockchain}{\term{best valid block chain}}
\newcommand{\blockchainReorganization}{\term{block chain reorganization}}
\newcommand{\blockchainReorganizations}{\terms{block chain reorganization}}
\newcommand{\branch}{\term{branch}}
\newcommand{\branches}{\termes{branch}}
\newcommand{\blockhainBranch}{\term{block chain branch}}
\newcommand{\blockchainBranches}{\termes{block chain branch}}
\newcommand{\mempool}{\term{mempool}}
\newcommand{\treestate}{\term{treestate}}
\newcommand{\treestates}{\terms{treestate}}
@ -8693,8 +8694,8 @@ each \spendDescription (\crossref{spendencoding}), and each \outputDescription (
%}
\overwinteronwarditem{The purpose of \versionGroupID{} is to allow unambiguous parsing of
\definingquotedterm{loose} \transactions, independent of the context of a \blockchain.
Code that parses \transactions is likely to be reused between \blockchain \branches as
defined in \cite{ZIP-200}, and in that case the \fOverwintered{} and \versionField{}
Code that parses \transactions is likely to be reused between \defining{\blockchainBranches}
as defined in \cite{ZIP-200}, and in that case the \fOverwintered{} and \versionField{}
fields alone may be insufficient to determine the format to be used for parsing.}
\item A \transactionVersionNumber of $2$ does not have the same meaning as in
\Bitcoin, where it is associated with support for \ScriptOP{CHECKSEQUENCEVERIFY}
@ -8930,8 +8931,8 @@ $32$ & \sprout{$\hashReserved$}
\saplingonward{The \merkleRoot $\LEBStoOSPOf{256}{\rt}$ of the \Sapling{}
\noteCommitmentTree corresponding to the final \Sapling{} \treestate of this \block.} \\ \hline
$4$ & $\nTimeField$ & \type{uint32} & The \blockTime is a Unix epoch time (UTC) when the miner
started hashing the \header (according to the miner). \\ \hline
$4$ & $\nTimeField$ & \type{uint32} & The \defining{\blockTimestamp} is a Unix epoch time (UTC)
when the miner started hashing the \header (according to the miner). \\ \hline
$4$ & $\nBitsField$ & \type{uint32} & An encoded version of the \targetThreshold this \block's
\header hash must be less than or equal to, in the same nBits format used by \Bitcoin.
@ -9181,10 +9182,11 @@ $\ToTarget(\nBitsField)$.
\lsubsubsection{Difficulty adjustment}{diffadjustment}
The desired time between \blocks is called the \defining{\blockTargetSpacing}.
\Zcash uses a difficulty adjustment algorithm based on DigiShield v3/v4 \cite{DigiByte-PoW},
with simplifications and altered parameters, to adjust difficulty to target
the desired \blockTime.
Unlike \Bitcoin, the difficulty adjustment occurs after every \block.
the desired \blockTargetSpacing. Unlike \Bitcoin, the difficulty adjustment occurs
after every \block.
\notbeforeblossom{The constants }$\PoWLimit$, $\PreBlossomHalvingInterval$, $\PoWAveragingWindow$,
$\PoWMaxAdjustDown$, $\PoWMaxAdjustUp$, $\PoWDampingFactor$,\notblossom{ and}