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Incremental commits spec changes #1511

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Aug 1, 2024
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Incremental commits spec changes #1511

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53867ce
Add incremental commits to the spec
ffakenz Jul 24, 2024
62d2dc5
PR review changes
v0d1ch Aug 1, 2024
5713489
Update spec/onchain.tex
v0d1ch Aug 1, 2024
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182 changes: 110 additions & 72 deletions spec/fig_offchain_prot.tex
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Original file line number Diff line number Diff line change
Expand Up @@ -47,10 +47,11 @@
$\Uinit \gets \bigcup_{j=1}^{n} U_j$ \;
% $\Out~(\hpSnap,(0,U_0))$ \;
$\hatmL \gets \Uinit$ \;
$\bar{\mc S} \gets \blue{\Sno(0, 0, \Uinit, \emptyset, \bot)}$ \;
$\bar{\mc S} \gets \blue{\Sno(0, 0, \Uinit, \emptyset, \bot \red{, \bot})}$ \;
$\hatv, \hats \gets 0$ \;
$\hatmT \gets \emptyset$ \;
$\tx_{\omega} \gets \bot$ \;
$\tx_\omega \gets \bot$ \;
\red{$\tx_\alpha \gets \bot$ \;}
}

\end{walgo}
Expand All @@ -73,29 +74,32 @@
$\hatmT \gets \hatmT \cup \{\tx\}$ \;
% issue snapshot if we are leader
\If{$\hats = \bar{\mc S}.s \land \hpLdr(\bar{\mc S}.s + 1) = i$}{
\Multi{} $(\hpRS,\hatv,\bar{\mc S}.s+1, \hatmT, \tx_{\omega})$ \;
\Multi{} $(\hpRS,\hatv,\bar{\mc S}.s+1,\hatmT \red{,\tx_\alpha}, \tx_\omega)$ \;
}
}
}

\vspace{12pt}

%%% REQ SN
\On{$(\hpRS,v,s,\mT_{\mathsf{req}}, \tx_{\omega})$ from $\party_j$}{
\On{$(\hpRS,v,s,\mT_{\mathsf{req}} \red{, \tx_\alpha} , \tx_\omega)$ from $\party_j$}{
\red{\Req{$\tx_\omega = \bot ~ \lor ~ \tx_\alpha = \bot$}} \;
\Req{$v = \hatv ~ \land ~ s = \hats + 1 ~ \land ~ \hpLdr(s) = j$} \;
\Wait{$\hats = \bar{\mc S}.s$}{
\Req{$\bar{\mc S}.U \applytx \tx_{\omega} \not= \bot$} \;
$U_{\mathsf{active}} \gets \bar{\mc S}.U \applytx \tx_{\omega} \setminus \mathsf{outputs(\tx_{\omega})}$ \;
\blue{
\Req{$\bar{\mc S}.U \applytx \tx_\omega \not= \bot$} \;
$U_{\mathsf{active}} \gets \bar{\mc S}.U \applytx \tx_\omega \setminus \mathsf{outputs(\tx_\omega)}$ \;
}
\Req{$U_{\mathsf{active}} \applytx \mT_{\mathsf{req}} \not= \bot$} \;
$U \gets U_{\mathsf{active}} \applytx \mT_{\mathsf{req}}$ \;
$\hats \gets s$ \;
% TODO: DRY message creation
$\eta \gets \combine(U)$ \;
% TODO: handwavy combine/outputs here
$\eta_{\omega} \gets \combine(\mathsf{outputs}(\tx_{\omega}))$ \;
\red{$\eta_\alpha \gets \mathsf{combine}(\mathsf{inputs}(\tx_\alpha))$ \;}
$\eta_\omega \gets \mathsf{combine}(\mathsf{outputs}(\tx_\omega))$ \;
% NOTE: WE could make included transactions auditable by adding
% a merkle tree root to the (signed) snapshot data \eta
$\msSig_i \gets \msSign(\hydraSigningKey, (\cid || v || \hats || \eta || \eta_{\omega}))$ \;
$\msSig_i \gets \msSign(\hydraSigningKey, (\cid || v || \hats || \eta \red{ || \eta_\alpha} || \eta_\omega))$ \;
$\hatSigma \gets \emptyset$ \;
$\Multi{}~(\hpAS,\hats,\msSig_i)$ \;
$\forall \tx \in \mT_{\mathsf{req}}: \Out~(\hpSeen,\tx)$ \;
Expand All @@ -116,13 +120,14 @@
\adjustbox{valign=t,scale=\sfact}{
\begin{walgo}{0.7}
%%% REC DEC
% \delta \in \tx_\omega
\On{$(\mathtt{reqDec},\tx)$ from $\party_j$}{
\Wait{$\tx_\omega = \bot ~ \land ~ \hatmL \applytx \tx \not= \bot$}{
\Wait{$\tx_\omega \red{= \tx_{\alpha}} = \bot ~ \land ~ \hatmL \applytx \tx_ \not= \bot$}{
$\hatmL \gets \hatmL \applytx \tx \setminus \mathsf{outputs}(\tx)$ \;
$\tx_\omega \gets \tx$ \;
% issue snapshot if we are leader
\If{$\hats = \bar{\mc S}.s \land \hpLdr(\bar{\mc S}.s + 1) = i$}{
\Multi{} $(\hpRS,\hatv,\bar{\mc S}.s+1,\hatmT, \tx_{\omega})$ \;
\Multi{} $(\hpRS,\hatv,\bar{\mc S}.s+1,\hatmT \red{,\tx_\alpha},\tx_\omega)$ \;
}
}
}
Expand All @@ -139,83 +144,116 @@

\vspace{12pt}

%%% ACK SN
\On{$(\hpAS,s,\msSig_j)$ from $\party_j$}{
\Req{} $s \in \{\hats,\hats+1\}$ \;
\Wait{$\hats=s$}{
\Req{} $(j, \cdot) \notin \hatSigma$ \;
$\hatSigma[j] \gets \sigma_{j}$ \;
\If{$\forall k \in [1..n]: (k,\cdot) \in \hatSigma$}{
% TODO: MS-ASig used different than in the preliminaries
$\msCSig \gets \msComb(\hydraKeys^{setup}, \hatSigma)$ \;

% TODO: DRY message creation
$\eta \gets \combine(\hatmU)$ \;
$\eta_{\omega} \gets \combine(\mathsf{outputs}(\tx_{\omega}))$ \;

% NOTE: Implementation differs here and
% below as it stores seen version in seen
% snapshot and uses that to verify
\Req{} $\msVfy(\hydraKeysAgg, (\cid || \blue{\hatv ||} \hats || \eta || \eta_{\omega}), \msCSig)$ \;
% create confirmed snapshot for later reference
\blue{$\bar{\mc S} \gets \Sno(\hatv, \hats, \hatmU, \hatmT , \tx_{\omega})$ \;}
$\bar{\mc S}.\sigma \gets \msCSig$ \;

%$\Out~(\hpSnap,(\bar{\mc S}.s,\bar{\mc S}.U))$ \;
$\forall \tx \in \mT_{\mathsf{req}} : \Out (\hpConf,\tx)$ \;
\If{${\bar S}.\tx_{\omega} \ne \bot$}{
$\PostTx{}~(\mtxDecrement, \hatv, \hats, \eta, \eta_{\omega})$ \;
% NOTE: Needed for security?
\blue{$\Out (\hpConf,\tx_{\omega})$ \;}
}
%%% REC INC
\red{
\On{$(\mathtt{reqInc}, \tx)$ from $\party_j$}{
\Wait{$\tx_\alpha = \tx_{\omega} = \bot$}{
$\tx_\alpha \gets \tx$\;
% issue snapshot if we are leader
\If{$\hpLdr(s+1) = i \land \hatmT \neq \emptyset$}{
\Multi{} $(\hpRS,\hatv,\bar{\mc S}.s+1, \hatmT, \tx_{\omega})$ \;
\If{$\hats = \bar{\mc S}.s \land \hpLdr(\bar{\mc S}.s + 1) = i$}{
\Multi{} $(\hpRS,\hatv,\bar{\mc S}.s+1,\hatmT, \red{\tx_\alpha} , \tx_\omega)$ \;
}
}
}
}

\vspace{12pt}

%%% INCREMENT
\red{\On{$(\mathtt{incrementTx}, U, v)$ from chain}{
\If{$\mathsf{inputs}(\tx_\alpha) = U$}{
$\hatmL \gets \hatmL \cup U$ \;
$\tx_\alpha \gets \bot$\;
$\hatv \gets v$ \;
}
}
}

\end{walgo}
}
\end{tabular}
\end{tabular}
\end{algobox}

\\
\multicolumn{1}{l}{\line(1,0){490}}
\\
\end{figure*}
\clearpage
\begin{figure*}[t!]

\def\sfact{0.8}
\begin{tabular}{c}
\\
\multicolumn{1}{l}{\line(1,0){490}}
\\
\begin{tabular}{c c}
\adjustbox{valign=t,scale=\sfact}{
\begin{walgo}{0.6}
%%% ACK SN
\On{$(\hpAS,s,\msSig_j)$ from $\party_j$}{
\Req{} $s \in \{\hats,\hats+1\}$ \;
\Wait{$\hats=s$}{
\Req{} $(j, \cdot) \notin \hatSigma$ \;
$\hatSigma[j] \gets \sigma_{j}$ \;
\If{$\forall k \in [1..n]: (k,\cdot) \in \hatSigma$}{
% TODO: MS-ASig used different than in the preliminaries
$\msCSig \gets \msComb(\hydraKeys^{setup}, \hatSigma)$ \;

% TODO: DRY message creation
$\eta \gets \combine(\hatmU)$ \;

\red{$\eta_\alpha \gets \mathsf{combine}(\mathsf{inputs}(\tx_\alpha))$ \;}
$\eta_\omega \gets \mathsf{combine}(\mathsf{outputs}(\tx_\omega))$ \;
% NOTE: Implementation differs here and
% below as it stores seen version in seen
% snapshot and uses that to verify
\Req{} $\msVfy(\hydraKeysAgg, (\cid || \blue{\hatv ||} \hats || \eta \red{|| \eta_\alpha} || \eta_\omega), \msCSig)$ \;
% create confirmed snapshot for later reference
\blue{$\bar{\mc S} \gets \Sno(\hatv, \hats, \hatmU, \hatmT, U_\alpha, U_\omega)$ \;}
$\bar{\mc S}.\sigma \gets \msCSig$ \;
%$\Out~(\hpSnap,(\bar{\mc S}.s,\bar{\mc S}.U))$ \;
$\forall \tx \in \mT_{\mathsf{req}} : \Out (\hpConf,\tx)$ \;

\If{${\bar S}.\tx_\omega \ne \bot$}{
$\PostTx{}~(\mathtt{decrementTx}, \hatv, \hats, \eta, \red{\eta_\alpha}, \eta_\omega)$ \;
% NOTE: Needed for security?
\blue{$\Out (\hpConf,\tx_\omega)$ \;}
}

% issue snapshot if we are leader
\If{$\hpLdr(s+1) = i \land \hatmT \neq \emptyset$}{
\Multi{} $(\hpRS,\hatv,\bar{\mc S}.s+1, \hatmT \red{, \tx_\alpha}, \tx_\omega)$ \;
}
}
}
}
\end{walgo}
}
%%% Closing the head
\begin{tabular}{c c}
\adjustbox{valign=t,scale=\sfact}{
\begin{walgo}{0.6}
% CLOSE from client
\On{$(\hpClose)$ from client}{
\adjustbox{valign=t,scale=\sfact}{
\begin{walgo}{0.6}
% CLOSE from client
\On{$(\hpClose)$ from client}{
$\eta \gets \combine(\bar{\mc S}.U)$ \;
$\eta_\omega \gets \combine(\bar{\mc S}.U_\omega)$ \;
\red{$\eta_\alpha \gets \combine(\bar{\mc S}.U_\alpha$) \;}
$\xi \gets \bar{\mc S}.\sigma$ \;
% XXX: \hatv needed to distinguish between CloseType redeemer, explain how exactly?
$\PostTx{}~(\mtxClose, \hatv, \bar{\mc S}.v, \bar{\mc S}.s, \eta \red{, \eta_\alpha}, \eta_\omega, \xi)$ \;
}
\vspace{12pt}
\On{$(\gcChainClose, \eta) \lor (\gcChainContest, s_{c}, \eta)$ from chain}{
\If{$\bar{\mc S}.s > s_{c}$}{
$\eta \gets \combine(\bar{\mc S}.U)$ \;
$\eta_\omega \gets \combine(\mathsf{outputs}(\bar{\mc S}.\tx_\omega))$ \;
$\eta_\omega \gets \combine({\bar{\mc S}.U_\omega})$ \;
\red{$\eta_\alpha \gets \combine(\bar{\mc S}.U_\alpha$) \;}
$\xi \gets \bar{\mc S}.\sigma$ \;
% XXX: \hatv needed to distinguish between CloseType redeemer, explain how exactly?
$\PostTx{}~(\mtxClose, \hatv, \bar{\mc S}.v, \bar{\mc S}.s, \eta, \eta_{\omega}, \xi)$ \;
}
\end{walgo}
}
&
\adjustbox{valign=t,scale=\sfact}{
\begin{walgo}{0.6}
\On{$(\gcChainClose, \eta) \lor (\gcChainContest, s_{c}, \eta)$ from chain}{
\If{$\bar{\mc S}.s > s_{c}$}{
$\eta \gets \combine(\bar{\mc S}.U)$ \;
$\eta_\omega \gets \combine(\mathsf{outputs}(\bar{\mc S}.\tx_\omega))$ \;
$\xi \gets \bar{\mc S}.\sigma$ \;
% XXX: \hatv needed to distinguish between CloseType redeemer, explain how exactly?
$\PostTx{}~(\mtxContest, \hatv, \bar{\mc S}.v, \bar{\mc S}.s, \eta, \eta_{\omega}, \xi)$ \;
}
$\PostTx{}~(\mtxContest, \hatv, \bar{\mc S}.v, \bar{\mc S}.s, \eta \red{, \eta_\alpha}, \eta_\omega , \xi)$ \;
}
\end{walgo}
}
\end{tabular}
}
\end{walgo}
}
\end{tabular}
\bigskip
\end{algobox}

\end{tabular}
\caption{Head-protocol machine for the \emph{coordinated head} from the perspective of party $\party_i$.}\label{fig:off-chain-prot}


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2 changes: 2 additions & 0 deletions spec/macros.tex
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Expand Up @@ -242,6 +242,7 @@
\newcommand{\mtxCommit}{\textit{commit}}
\newcommand{\mtxCCom}{\textit{collectCom}}
\newcommand{\mtxCollect}{\textit{collectCom}}
\newcommand{\mtxIncrement}{\textit{increment}}
\newcommand{\mtxDecrement}{\textit{decrement}}
\newcommand{\mtxAbort}{\textit{abort}}
\newcommand{\mtxClose}{\textit{close}}
Expand Down Expand Up @@ -417,6 +418,7 @@

\newcommand{\hpNS}{\mathtt{newSn}}
\newcommand{\hpRS}{\mathtt{reqSn}}
\newcommand{\hpRI}{\mathtt{reqInc}}
\newcommand{\hpRD}{\mathtt{reqDec}}
\newcommand{\hpAS}{\mathtt{ackSn}}
\newcommand{\hpCS}{\mathtt{confSn}}
Expand Down
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