mirror of https://github.com/zcash/orchard.git
267 lines
15 KiB
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267 lines
15 KiB
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<ol class="chapter"><li class="chapter-item expanded affix "><a href="index.html">Orchard</a></li><li class="chapter-item expanded "><a href="concepts.html"><strong aria-hidden="true">1.</strong> Concepts</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="concepts/preliminaries.html"><strong aria-hidden="true">1.1.</strong> Preliminaries</a></li></ol></li><li class="chapter-item expanded "><a href="user.html"><strong aria-hidden="true">2.</strong> User Documentation</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="user/keys.html"><strong aria-hidden="true">2.1.</strong> Creating keys and addresses</a></li><li class="chapter-item expanded "><a href="user/creating-notes.html"><strong aria-hidden="true">2.2.</strong> Creating notes</a></li><li class="chapter-item expanded "><a href="user/spending-notes.html"><strong aria-hidden="true">2.3.</strong> Spending notes</a></li><li class="chapter-item expanded "><a href="user/integration.html"><strong aria-hidden="true">2.4.</strong> Integration into an existing chain</a></li></ol></li><li class="chapter-item expanded "><a href="design.html" class="active"><strong aria-hidden="true">3.</strong> Design</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="design/keys.html"><strong aria-hidden="true">3.1.</strong> Keys and addresses</a></li><li class="chapter-item expanded "><a href="design/actions.html"><strong aria-hidden="true">3.2.</strong> Actions</a></li><li class="chapter-item expanded "><a href="design/commitments.html"><strong aria-hidden="true">3.3.</strong> Commitments</a></li><li class="chapter-item expanded "><a href="design/commitment-tree.html"><strong aria-hidden="true">3.4.</strong> Commitment tree</a></li><li class="chapter-item expanded "><a href="design/nullifiers.html"><strong aria-hidden="true">3.5.</strong> Nullifiers</a></li><li class="chapter-item expanded "><a href="design/signatures.html"><strong aria-hidden="true">3.6.</strong> Signatures</a></li><li class="chapter-item expanded "><a href="design/circuit.html"><strong aria-hidden="true">3.7.</strong> Circuit</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="design/circuit/gadgets.html"><strong aria-hidden="true">3.7.1.</strong> Gadgets</a></li><li class="chapter-item expanded "><a href="design/circuit/commit-ivk.html"><strong aria-hidden="true">3.7.2.</strong> CommitIvk</a></li><li class="chapter-item expanded "><a href="design/circuit/note-commit.html"><strong aria-hidden="true">3.7.3.</strong> NoteCommit</a></li></ol></li></ol></li></ol>
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<h1 id="design"><a class="header" href="#design">Design</a></h1>
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<h2 id="general-design-notes"><a class="header" href="#general-design-notes">General design notes</a></h2>
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<h3 id="requirements"><a class="header" href="#requirements">Requirements</a></h3>
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<ul>
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<li>Keep the design close to Sapling, while eliminating aspects we don't like.</li>
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</ul>
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<h3 id="non-requirements"><a class="header" href="#non-requirements">Non-requirements</a></h3>
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<ul>
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<li>Delegated proving with privacy from the prover.
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<ul>
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<li>We know how to do this, but it would require a discrete log equality proof, and the
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most efficient way to do this would be to do RedDSA and this at the same time, which
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means more work for e.g. hardware wallets.</li>
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</ul>
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</li>
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</ul>
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<h3 id="open-issues"><a class="header" href="#open-issues">Open issues</a></h3>
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<ul>
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<li>Should we have one memo per output, or one memo per transaction, or 0..n memos?
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<ul>
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<li>Variable, or (1 or n), is a potential privacy leak.</li>
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<li>Need to consider the privacy issue related to light clients requesting individual
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memos vs being able to fetch all memos.</li>
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</ul>
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</li>
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</ul>
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<h3 id="note-structure"><a class="header" href="#note-structure">Note structure</a></h3>
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<ul>
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<li>TODO: UDAs: arbitrary vs whitelisted</li>
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</ul>
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<h3 id="typed-variables-vs-byte-encodings"><a class="header" href="#typed-variables-vs-byte-encodings">Typed variables vs byte encodings</a></h3>
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<p>For Sapling, we have encountered multiple places where the specification uses typed
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variables to define the consensus rules, but the C++ implementation in zcashd relied on
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byte encodings to implement them. This resulted in subtly-different consensus rules being
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deployed than were intended, for example where a particular type was not round-trip
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encodable.</p>
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<p>In Orchard, we avoid this by defining the consensus rules in terms of the byte encodings
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of all variables, and being explicit about any types that are not round-trip encodable.
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This makes consensus compatibility between strongly-typed implementations (such as this
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crate) and byte-oriented implementations easier to achieve.</p>
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