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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.
38 lines
1.4 KiB
TeX
38 lines
1.4 KiB
TeX
\section{Confidential Token Standard}
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\subsection{LRC-721P (Private NFTs)}
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Extension of ERC-721 with privacy:
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\begin{algorithm}[H]
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\caption{Shielded NFT Transfer}
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\begin{algorithmic}[1]
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\State \textbf{Input:} NFT ID $n$, recipient address $A_{\text{recv}}$, nullifier $\nu$
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\State \textbf{Output:} zk-SNARK proof $\pi$
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\State
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\State // Prove ownership without revealing identity
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\State $\text{commitment}_{\text{old}} \leftarrow \text{Hash}(n, A_{\text{sender}}, \text{salt})$
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\State $\text{commitment}_{\text{new}} \leftarrow \text{Hash}(n, A_{\text{recv}}, \text{salt}')$
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\State
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\State // Public inputs: $(\text{commitment}_{\text{old}}, \text{commitment}_{\text{new}}, \nu)$
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\State // Private inputs: $(n, A_{\text{sender}}, A_{\text{recv}}, \text{salt}, \text{salt}')$
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\State
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\State $\pi \leftarrow \text{Prove}\left(\begin{array}{l}
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\text{commitment}_{\text{old}} \text{ in Merkle tree} \\
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\land \ \nu = \text{Hash}(n, A_{\text{sender}}) \\
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\land \ \text{commitment}_{\text{new}} = \text{Hash}(n, A_{\text{recv}}, \text{salt}')
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\end{array}\right)$
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\State \textbf{return} $\pi$
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\end{algorithmic}
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\end{algorithm}
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\textbf{Privacy Properties}:
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\begin{itemize}[leftmargin=1.1em]
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\item NFT ownership hidden (only commitment visible)
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\item Transfer recipient hidden (encrypted address)
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\item Transfer history unlinkable (nullifiers prevent double-spend)
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\item Optional metadata disclosure via auditor key
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\end{itemize}
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