Protocol Extension: Anonymous Credentials#253
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a1denvalu3 wants to merge 34 commits intocashubtc:mainfrom
Draft
Protocol Extension: Anonymous Credentials#253a1denvalu3 wants to merge 34 commits intocashubtc:mainfrom
a1denvalu3 wants to merge 34 commits intocashubtc:mainfrom
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- Add Status/Scope/Dependencies headings - Normalize numbered sections: Endpoint, Request, Verification, Response, Errors, Security - Enforce normative constraints (units, active keysets, tag/hex formats) - Clarify transcript ordering and fee delta in AC-03 - Align AC-01/02 keyset semantics and error codes - Improve interop notes and references
- Add Status/Scope/Dependencies and numbered sections - Normalize endpoints, request/response, constraints, verification, errors - Define mint/melt balance delta, unit and keyset constraints - Add fee return handling and ordering of tweaks vs signature issuance (AC-05) - Clarify security/policy notes and references
- Add normative constraints: inputs.len()==2, outputs.len()==2, mac_proofs.len()==2 - Document decoy shaping via AC-06 zero-amount notes and zero-amount outputs (with RangeProof) - Keep unit/keyset/transcript constraints consistent across specs
…actors (NUT-13 style)
- Define BIP32 path: m/129372'/1'/{keyset_id_int}'/{counter}'/{c} with c∈{0:tag,1:amount_bf,2:script_bf}
- Specify keyset-scoped counters, integer keyset id mapping, and interop rules
- Add AC-00 note referencing AC-07 for deterministic wallets
- v1: legacy BIP32 path (extended to 3 components)
- v2: HMAC-SHA512 KDF keyed by BIP39 seed; no BIP32 usage
- Component byte c∈{0,1,2} distinguishes tag, amount_bf, script_bf
- Clarify counters, keyset_id mapping, security, and interop
- Replace HMAC-SHA512 with HMAC-SHA256 for keyset v2 - Use label Cashu_KDF_HMAC_SHA256 and keep entire digest, reduce mod n - Maintain BIP32 only for v1 legacy
- keyset_id_bytes = raw keyset id (v1: 8 bytes, v2: 33 bytes) - counter_bytes = 8-byte big-endian unsigned - Keep HMAC-SHA256 label and full digest mod n
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