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zeekay
abf99d05fc
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.
29 lines
881 B
TeX
29 lines
881 B
TeX
\section{Selective Disclosure}
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\subsection{Auditor Key System}
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Z-Chain implements \textbf{hierarchical auditor keys}:
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\begin{enumerate}
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\item \textbf{User Keys}: Can view own transaction history
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\item \textbf{Contract Auditor Keys}: Can view all contract transactions
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\item \textbf{Regulatory Keys}: Can view transactions matching specific criteria (e.g., $>$ \$10k transfers)
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\item \textbf{Court Order Keys}: Can view specific addresses (requires on-chain governance vote)
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\end{enumerate}
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\subsection{View Key Protocol}
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\textbf{Generating View Key}:
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\begin{equation}
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vk = \text{HKDF}(sk_{\text{user}}, \text{``view\_key''}, \text{salt})
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\end{equation}
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\textbf{Decrypting Commitment}:
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\begin{equation}
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\text{PlaintextData} = \text{Decrypt}(C, vk)
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\end{equation}
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Auditors receive $vk$ (not $sk_{\text{user}}$), enabling read-only access without spending authority.
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