Consent gate (the legal linchpin from the wet-signature memo):
- migration 092 adds ink_consent/ink_consent_at/ink_consent_text to esign_records
- extract pure, unit-tested gate logic into esign-ink-consent.ts (DRY single
source for route + signing page): isInkReproduction / inkConsentRequired /
inkConsentSatisfied + verbatim client-safe INK_CONSENT_TEXT
- portal-esign-generic.ts: GET surfaces ink_reproduction + consent text; POST
gates DRAWN signatures on ink-path docs on explicit consent, stores it
- signing page locks the signature block until consent is checked (drawn only)
- npi_provider marks cms855/cms10114 esign metadata ink_reproduction=true
- 33 unit checks: gate truth table + consent text omits all internal mechanics
(plotter/machine/CMS/MAC/etc) and keeps required legal reassurances
Patent-risk memo (docs/legal/patent-risk-mechanical-wet-signature.md):
- prior-art-dated risk analysis (autopen 1803/1942, plotters, CNC = public domain
=> low risk on core concept; e-sign workflow space litigious)
- firsthand recent-grant sweep (1.58M USPTO grants 2021-2025, queried via DuckDB):
ZERO patents on machine-applies-signature-in-ink; e-sign players hold only
electronic-workflow patents. Not an FTO; flags where attorney search is needed
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