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zeekay
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Restructured from flat .tex/.pdf files into per-paper subdirectories. Added Antje Worring as co-author on all papers. Synced PDFs to pdfs/ for download site.
45 lines
1.8 KiB
TeX
45 lines
1.8 KiB
TeX
\section{Message Envelope}
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Every cross-chain message is encoded as a typed envelope with 13 mandatory fields:
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\begin{center}
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\begin{tabular}{rlll}
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\toprule
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\textbf{\#} & \textbf{Field} & \textbf{Type} & \textbf{Purpose} \\
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\midrule
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1 & \texttt{version} & \texttt{uint8} & Protocol version (currently 1) \\
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2 & \texttt{type} & \texttt{uint8} & Message type (DEPOSIT/BURN/RELEASE/BACKING) \\
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3 & \texttt{srcChain} & \texttt{uint256} & Source chain identifier \\
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4 & \texttt{dstChain} & \texttt{uint256} & Destination chain identifier \\
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5 & \texttt{router} & \texttt{address} & Source chain router contract \\
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6 & \texttt{asset} & \texttt{bytes32} & Canonical asset identifier \\
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7 & \texttt{nonce} & \texttt{uint256} & Per-router monotonic sequence number \\
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8 & \texttt{amount} & \texttt{uint256} & Transfer amount \\
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9 & \texttt{recipient} & \texttt{bytes32} & Destination address (chain-agnostic) \\
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10 & \texttt{expiry} & \texttt{uint64} & Message expiry (Unix timestamp) \\
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11 & \texttt{originTxHash} & \texttt{bytes32} & Source chain transaction hash \\
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12 & \texttt{payloadHash} & \texttt{bytes32} & SHA-256 of additional payload data \\
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13 & \texttt{domainSeparator} & \texttt{bytes32} & See Section~\ref{sec:domain} \\
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\bottomrule
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\end{tabular}
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\end{center}
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No field is optional. Missing or zero-valued fields cause immediate rejection.
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\subsection{Message Types}
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\begin{center}
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\begin{tabular}{lll}
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\toprule
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\textbf{Type} & \textbf{Direction} & \textbf{Semantics} \\
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\midrule
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\texttt{DEPOSIT} & User $\to$ Source chain & Lock assets in source vault \\
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\texttt{BURN} & Source chain $\to$ MPC & Notify MPC of locked assets \\
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\texttt{RELEASE} & MPC $\to$ Destination chain & Release wrapped/native assets \\
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\texttt{BACKING} & MPC $\to$ Source chain & Confirm backing (monotonic attestation) \\
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\bottomrule
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\end{tabular}
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\end{center}
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