Spec: 087-codec-standards-adoption (voidpay-ai ops/specs/087-codec-standards-adoption/spec.md)
Author: kai-cto · Date: 2026年05月28日

Goal

A layered, additive-only architecture for adopting external standards over time
without ever touching the LOCKED schema v1 wire format (Constitution IV).

L3 @void-layer/export — renderers over decoded model (EN16931 / UBL / CII / Factur-X / schema.org)
L2 @void-layer/interop — Hybrid C: pure projections + asCaip() View + EIP derive/receipt
L1 @void-layer/codec — LOCKED v1, APPEND-ONLY (new dict codes / new even-odd TLV types only)
 flow: wire bytes → decode → canonical raw model → projection / renderer

Plug-in contract: every new standard answers — which layer? input? output (lossy?)?
touches existing artifacts (must not)? Wire additions go through the append-only registry

• dict-lock hash test; interop/export additions are new modules behind a stable interface.

Ratified principle: CAIP / standard strings are API-boundary projections only — the
void-layer wire format never contains them.

Decision matrix → sub-issues

Verdict: 🟢 adopt now · 🟡 gated/scoped · 🔵 defer (mechanism ready) · ⚪ watch

Deferred / watch (no sub-issue yet — not actionable)

• EN 16931 → UBL/CII renderers (L3, P3) — v1.6 merchant track
• CAIP non-EVM dict codes (Solana solana: / Bitcoin bip122:) (L1 append, P4) — when chain added; mechanism ready
• Peppol BIS Billing 3.0 (L3 transport, P4) — ~2029 (ViDA 2030); needs certified Access Point
• DTI (ISO 24165) (watch) — gated on MiCA CASP-scope legal opinion

Open items (tracked, not blockers)

• Factur-X path decision (pdfium WASM vs pdf-lib low-level vs stateless edge step) — product call on zero-backend strictness
• MiCA CASP scope legal opinion (gates DTI)
• EIP-712 TLV type 33 raw-field set confirmation before allocation
• USDT 3-tier annotation (tether_native / usdt0 / bridge_wrapped) in token dict metadata