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17 lines
843 B
TeX
17 lines
843 B
TeX
\section{Merkle Patricia tries}
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\label{tries}
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\subsection{Internal memory format}
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Withour our zkEVM's kernel memory,
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\begin{enumerate}
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\item An empty node is encoded as $(\texttt{MPT\_NODE\_EMPTY})$.
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\item A branch node is encoded as $(\texttt{MPT\_NODE\_BRANCH}, c_1, \dots, c_{16}, v)$, where each $c_i$ is a pointer to a child node, and $v$ is a leaf payload.
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\item An extension node is encoded as $(\texttt{MPT\_NODE\_EXTENSION}, k, c)$, $k$ is a 2-tuple $(\texttt{packed\_nibbles}, \texttt{num\_nibbles})$, and $c$ is a pointer to a child node.
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\item A leaf node is encoded as $(\texttt{MPT\_NODE\_LEAF}, k, v)$, where $k$ is a 2-tuple as above, and $v$ is a leaf payload.
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\item A digest node is encoded as $(\texttt{MPT\_NODE\_DIGEST}, d)$, where $d$ is a Keccak256 digest.
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\end{enumerate}
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\subsection{Prover input format}
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