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Confidential Token: docs refactor - #869
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Witness assembly now names all six circuits, drawn-scalar and citation lists match DESIGN, and the D-auditor sponge reads each channel at its fixed width. DESIGN_cont §11 corrects struct-field order to the sorted form the contracttype macro emits.
Mechanical move of DESIGN, DESIGN_cont, SDK, SELECTIVE_DISCLOSURE, COMPLIANCE, INDEXER, and OVERVIEW into docs/{protocol,sdk,selective-disclosure}/ and lower-case single files. Headings are de-numbered and re-levelled and cited bold labels become headings; body text is unchanged. Citations still use the old section numbers and are rewritten in the next commit.
Every section-number citation in the docs, the Rust and Noir comments, and the agent guides becomes a relative path with a GitHub heading anchor. docs/README.md maps the set, and docs/check_links.py, run by the new docs workflow, fails CI on a missing file or heading, a duplicate anchor within a file, or a file over the LaTeX rendering budget.
The recovery procedure, checkpoint set, and T0 anchor are stated only in protocol/wallet-state.md; the domain-tag table lives only in protocol/domain-separators.md, now with the layer that absorbs each tag; the per-lane auditor map moves into protocol/auditing.md; the overview and the SDK cite these instead of restating them. ACIR opcode counts are no longer quoted in prose, leaving circuits/constraints.baseline as their only record.
Drop the markdown-only backslash escape before subscripts inside math spans, which GitHub renders identically with and without (checked through its markdown API), keep LaTeX's own escaped underscore inside \text{}, and lift overview.md's single-dollar spans to $$. Citations that sat inside \text{} become plain section titles.
Replace the bespoke checker with lychee-action over the module's Markdown plus a generated link list of the Rust, Noir, and guide citations. The one heading that carried LaTeX now uses a code span, since lychee and GitHub slug math differently.
The split left the index author-facing, overview.md unreachable from any path, and no file pointing to the next one. The index now opens with where to start, every file ends with previous/up/next links, and the operations index lists its operations in order.
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WalkthroughThe change replaces legacy confidential-token specifications with indexed protocol, SDK, and selective-disclosure documentation. It updates code citations and adds a GitHub Actions workflow that extracts citations and validates Markdown links offline. ChangesConfidential Token Documentation
Estimated code review effort: 3 (Moderate) | ~30 minutes Merge Risk: 🟠 High · up to Several normative specifications could lead implementations to become incompatible or lose recovery correctness. These contracts should be reconciled before merge. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
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Footers now read "Index" and anchor to the README subsection that lists the file: #protocol for the specification, #companions for the rest.
GitHub parses a `$$…$$` span's contents with its markdown inline parser before MathJax sees them, so an unescaped `_` flanked by punctuation pairs with the next one in the same paragraph and the resulting `<em>` destroyed both spans. 187 of 1756 spans rendered as literal text; the escape is stripped again on the way to MathJax, so `\_` still arrives as a subscript.
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Actionable comments posted: 14
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Inline comments:
In @.github/workflows/docs.yml:
- Line 20: Add workflow-level permissions for the docs workflow, setting
contents access to read only near the top-level workflow configuration before
jobs. Keep the existing jobs unchanged.
In `@packages/tokens/src/confidential/docs/protocol/domain-separators.md`:
- Line 29: Remove the alternate δ_X Poseidon2 domain-tag scheme and its
deployment-time choice from the protocol documentation. Keep the existing fixed
protocol constants and their hardcoded interoperability requirements unchanged;
alternate tags must be introduced only in a future protocol version with new
circuit artifacts and explicit compatibility rules.
In `@packages/tokens/src/confidential/docs/protocol/operations/revoke-spender.md`:
- Line 18: The revoke documentation contradicts the recovery contract: update
the RevokeSpender description to state that it emits the current allowance_salt
for both never-spent and previously-spent delegations, preserving wallet
recovery of v_a and r_a. If the event behavior is actually different, update the
event and wallet recovery rules consistently instead.
In `@packages/tokens/src/confidential/docs/protocol/operations/transfer.md`:
- Line 27: Update the T_a4 recipient-auditor encrypted transfer randomness
description to reference C_transfer instead of C_receive, while preserving the
existing formula and surrounding auditing link.
In `@packages/tokens/src/confidential/docs/protocol/README.md`:
- Line 45: Update the protocol circuit description to distinguish the five core
circuits from the optional compliance extension, explicitly identifying clawback
as the sixth optional circuit; keep the existing core circuit list accurate.
In `@packages/tokens/src/confidential/docs/protocol/security.md`:
- Around line 49-51: Qualify the viewing-key compromise discussion around
“recompute the ephemeral scalar” and the retroactive disclosure claim to apply
only to transfers whose ephemeral scalar is reproducible from (vk, σ). Preserve
the existing conclusions for deterministic-scalar transfers, while explicitly
excluding legacy transfers that cannot reproduce r_e and therefore cannot yield
the recipient shared scalar or full transfer opening.
- Line 13: Update the corollary’s receiving-balance claim to avoid describing it
as unbounded; state the supported range and overflow behavior based on the
in-circuit [0, 2^127) bound, or limit the statement to the proven range. Keep
the transfer and commitment discussion consistent with exact-integer
accumulation and finite-field constraints.
In `@packages/tokens/src/confidential/docs/protocol/wallet-state.md`:
- Line 53: Update the recovery description near T_0 to avoid asserting a fixed
seven-day RPC history; describe retention as a bounded, node-reported window
using getHealth’s oldestLedger and ledgerRetentionWindow, and note that
getEvents rejects ranges before oldestLedger. Preserve the requirement for a
durable archive when local state falls outside the node-reported boundary.
In `@packages/tokens/src/confidential/docs/sdk/clients.md`:
- Around line 11-15: Update the verifier result contract to include a distinct
not-disclosable outcome alongside proof verification, on-chain state mismatch,
and decryption failure. Define the caller behavior for legacy transfers whose
derived ephemeral scalar does not match the event’s ephemeral key: report not
disclosable, do not classify it as verification failure, and do not return a
disclosed amount.
In `@packages/tokens/src/confidential/docs/sdk/crypto-core.md`:
- Line 58: Update the modulus-difference example in the documentation near the
distinct reduction operations requirement: replace the absolute “off by q − r”
claim with wording that the result is generally different, or express the
difference as dependent on the integer s. Preserve the warning about using
separate reductions modulo q and r.
- Line 68: Rename the heading “Secret scalars” to “Sampled scalars” in the
documented scalar requirements, and clarify that σ, σ_a, σ_a', and r_disc must
be securely sampled but may be published or persisted by the protocol for event
processing and recovery.
In `@packages/tokens/src/confidential/docs/sdk/proving.md`:
- Line 5: Update the witness-assembly requirement sentence to list exactly the
five core circuits—Register, Withdraw, Transfer, SpenderTransfer, and
SetSpender—then state that Clawback is additionally required when the compliance
extension is enabled. Preserve the existing auditor-role context and circuit
references.
In
`@packages/tokens/src/confidential/docs/selective-disclosure/circuits/aggregate.md`:
- Around line 25-27: Update the aggregate circuit documentation around AGG,
THRESH, and U1–U3 to make the V_total bound normative before threshold checks or
encryption. Specify the required event-count bound, such as n ≤ 64, and explain
that it keeps the sum below the Field modulus given each amount’s range;
alternatively, define and use a range-checked multi-limb integer representation
for V_total in THRESH and U1–U3.
In `@packages/tokens/src/confidential/docs/selective-disclosure/README.md`:
- Line 26: Update the proof-security statement in the selective-disclosure
documentation to remove claims that recipient binding makes a proof useless to
others or prevents resale or redistribution. State instead that the bundle
remains publicly verifiable, only the holder of r_R can decrypt the disclosed
value, and binding ν prevents reuse for a different request while allowing the
recipient to share the decrypted value.
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📒 Files selected for processing (70)
.github/workflows/docs.ymlpackages/tokens/src/confidential/CLAUDE.mdpackages/tokens/src/confidential/README.mdpackages/tokens/src/confidential/circuits/CLAUDE.mdpackages/tokens/src/confidential/circuits/clawback/src/main.nrpackages/tokens/src/confidential/circuits/gadgets/assert_on_curve/src/main.nrpackages/tokens/src/confidential/circuits/gadgets/sponge_squeeze_2/src/main.nrpackages/tokens/src/confidential/circuits/lib/src/lib.nrpackages/tokens/src/confidential/circuits/lib/src/tests.nrpackages/tokens/src/confidential/circuits/register/src/main.nrpackages/tokens/src/confidential/circuits/set_spender/src/main.nrpackages/tokens/src/confidential/circuits/set_spender/src/tests.nrpackages/tokens/src/confidential/circuits/spender_transfer/src/main.nrpackages/tokens/src/confidential/circuits/spender_transfer/src/tests.nrpackages/tokens/src/confidential/circuits/transfer/src/main.nrpackages/tokens/src/confidential/circuits/transfer/src/tests.nrpackages/tokens/src/confidential/circuits/withdraw/src/main.nrpackages/tokens/src/confidential/circuits/withdraw/src/tests.nrpackages/tokens/src/confidential/compliance/mod.rspackages/tokens/src/confidential/compliance/storage.rspackages/tokens/src/confidential/docs/DESIGN.mdpackages/tokens/src/confidential/docs/DESIGN_cont.mdpackages/tokens/src/confidential/docs/README.mdpackages/tokens/src/confidential/docs/SDK.mdpackages/tokens/src/confidential/docs/SELECTIVE_DISCLOSURE.mdpackages/tokens/src/confidential/docs/compliance.mdpackages/tokens/src/confidential/docs/indexer.mdpackages/tokens/src/confidential/docs/overview.mdpackages/tokens/src/confidential/docs/protocol/README.mdpackages/tokens/src/confidential/docs/protocol/account-state.mdpackages/tokens/src/confidential/docs/protocol/auditing.mdpackages/tokens/src/confidential/docs/protocol/domain-separators.mdpackages/tokens/src/confidential/docs/protocol/interface.mdpackages/tokens/src/confidential/docs/protocol/keys-and-commitments.mdpackages/tokens/src/confidential/docs/protocol/operations/README.mdpackages/tokens/src/confidential/docs/protocol/operations/deposit.mdpackages/tokens/src/confidential/docs/protocol/operations/merge.mdpackages/tokens/src/confidential/docs/protocol/operations/register.mdpackages/tokens/src/confidential/docs/protocol/operations/revoke-spender.mdpackages/tokens/src/confidential/docs/protocol/operations/set-spender.mdpackages/tokens/src/confidential/docs/protocol/operations/spender-transfer.mdpackages/tokens/src/confidential/docs/protocol/operations/transfer.mdpackages/tokens/src/confidential/docs/protocol/operations/withdraw.mdpackages/tokens/src/confidential/docs/protocol/primitives.mdpackages/tokens/src/confidential/docs/protocol/proof-system.mdpackages/tokens/src/confidential/docs/protocol/security.mdpackages/tokens/src/confidential/docs/protocol/system-model.mdpackages/tokens/src/confidential/docs/protocol/wallet-state.mdpackages/tokens/src/confidential/docs/sdk/README.mdpackages/tokens/src/confidential/docs/sdk/auditor-client.mdpackages/tokens/src/confidential/docs/sdk/clients.mdpackages/tokens/src/confidential/docs/sdk/conformance.mdpackages/tokens/src/confidential/docs/sdk/crypto-core.mdpackages/tokens/src/confidential/docs/sdk/key-derivation.mdpackages/tokens/src/confidential/docs/sdk/proving.mdpackages/tokens/src/confidential/docs/sdk/requirements.mdpackages/tokens/src/confidential/docs/sdk/wallet.mdpackages/tokens/src/confidential/docs/selective-disclosure/README.mdpackages/tokens/src/confidential/docs/selective-disclosure/circuits/aggregate.mdpackages/tokens/src/confidential/docs/selective-disclosure/circuits/d-auditor.mdpackages/tokens/src/confidential/docs/selective-disclosure/circuits/d-balance.mdpackages/tokens/src/confidential/docs/selective-disclosure/circuits/d-recipient.mdpackages/tokens/src/confidential/docs/selective-disclosure/circuits/d-sender.mdpackages/tokens/src/confidential/docs/selective-disclosure/protocol.mdpackages/tokens/src/confidential/docs/selective-disclosure/security.mdpackages/tokens/src/confidential/mod.rspackages/tokens/src/confidential/storage.rspackages/tokens/src/confidential/test.rspackages/tokens/src/confidential/verifier/mod.rspackages/tokens/src/confidential/verifier/storage.rs
💤 Files with no reviewable changes (4)
- packages/tokens/src/confidential/docs/SELECTIVE_DISCLOSURE.md
- packages/tokens/src/confidential/docs/DESIGN.md
- packages/tokens/src/confidential/docs/SDK.md
- packages/tokens/src/confidential/docs/DESIGN_cont.md
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ozgunozerk
approved these changes
Sep 10, 2026
Carries the clawback proof bindings of #872 (auditor key ownership, per-account nonce) into the split documentation tree: the DESIGN_cont.md and SDK.md edits land in protocol/proof-system.md and sdk/auditor-client.md, and the new compliance.md content cites by anchor. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
List the protocol files as bullets, rename the third Approach item to "Dual-balance model", and drop the CAP-80 aside from the abstract. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
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fix #849 |
The aggregate spec only tabulated the D-recipient shape, so the D-sender aggregate it prescribed could not be assembled (#849). Each role now has per-event inputs, witnesses, and constraints, with per-event keys so an aggregate may span accounts; padding, threshold agreement, the auditor channel, and the decrypt domain are pinned down as well.
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