The Cryptographic
Proof of Presence
EVV Has Been Waiting For
The 21st Century Cures Act mandates Electronic Visit Verification for all Medicaid personal care and home health services. VerifiedKnock delivers the only solution that provides hardware-enforced, biometrically-bound proof that a caregiver was physically at the patient's door — with zero GPS spoofing risk.
Cryptographic Proof of Presence
Not GPS. Not a PIN. Not a phone tap. Biometric hardware proof.
Current EVV Systems Are Easily Defeated
GPS-based EVV — the current standard — is trivially spoofed. Medicaid fraud costs taxpayers an estimated $100 billion per year, and a significant portion comes from home health billing fraud.
GPS Spoofing
Free apps allow caregivers to fake their GPS location. A nurse can "check in" from a different state while billing for a home visit.
Buddy Punching
One caregiver clocks in for another. PIN-based and phone-tap EVV systems cannot verify that the right person is at the door.
Ghost Visits
Billing for visits that never happened. Without physical proof of presence, agencies have no way to dispute fraudulent claims.
How VerifiedKnock Solves EVV Fraud
A biometric smart card + door-mounted NFC receiver creates an unforgeable proof of presence that satisfies all 21st Century Cures Act requirements.
Biometric Binding at the Card
The caregiver presses their thumb on the ATKey.Card. The fingerprint match happens entirely on the card's secure element — the biometric never leaves the hardware. No database, no cloud, no breach risk.
Physical Tap at the Door
The activated card is tapped to the NFC sticker or VerifiedAmbient™ reader mounted on the patient's door frame. This creates a cryptographically signed, timestamped visit record — unforgeable and location-bound.
Offline-First — Rural Ready
No internet connection required at the point of care. Visit records sync when connectivity is available. Critical for rural home health agencies serving patients in low-coverage areas.
Audit-Ready Visit Records
Every visit generates a tamper-proof record with caregiver identity, timestamp, and location — ready for Medicaid audits, RAC reviews, and OIG investigations.
21st Century Cures Act
Compliance Mapping
Your State's EVV Mandate — Solved
Every state has unique EVV challenges. VerifiedKnock's offline-first, no-GPS architecture addresses the most common compliance gaps across the country.
California
Active — DHCS EVV mandate enforcedCalifornia's Medicaid program (Medi-Cal) serves over 14 million beneficiaries. The DHCS EVV mandate covers IHSS (In-Home Supportive Services) and home health agencies. GPS-based systems have faced pushback from SEIU-represented IHSS workers over privacy concerns.
VerifiedKnock solution: VerifiedKnock's outbound-only, no-GPS architecture directly addresses SEIU privacy objections. No worker location is tracked — only a cryptographic proof that they were at the patient's door.
Texas
Active — HHSC EVV mandate enforcedTexas HHSC mandates EVV for all Medicaid personal care services. The state has a large rural population with significant connectivity gaps, making GPS and phone-based EVV systems unreliable in West Texas and the Panhandle.
VerifiedKnock solution: VerifiedKnock's offline-first architecture works in zero-connectivity environments. Visit records are stored on-card and sync when the caregiver returns to a connected area — no dropped verifications.
Florida
Active — AHCA EVV mandate enforcedFlorida AHCA oversees one of the largest Medicaid home health programs in the country. The state has seen significant EVV fraud enforcement actions, with multiple agencies facing recoupment for GPS-spoofed visit records.
VerifiedKnock solution: VerifiedKnock's hardware-enforced proof of presence eliminates the GPS spoofing vector entirely. Agencies using VerifiedKnock can demonstrate to AHCA auditors that their visit records are cryptographically unforgeable.
New York
Active — DOH EVV mandate enforcedNew York DOH EVV requirements cover CDPAP (Consumer Directed Personal Assistance Program) and home health agencies. New York City's dense urban environment creates unique challenges: multi-unit buildings, elevator interference, and GPS signal degradation.
VerifiedKnock solution: VerifiedKnock uses NFC — not GPS — so building density and GPS signal quality are irrelevant. The NFC sticker is mounted at the apartment door, providing precise location proof regardless of the building structure.
Illinois
Active — HFS EVV mandate enforcedIllinois HFS mandates EVV for all Medicaid home and community-based services. The state has a significant rural population in Southern Illinois where cellular coverage is limited, creating compliance gaps for phone-based EVV systems.
VerifiedKnock solution: VerifiedKnock's offline-first NFC system requires no cellular signal at the point of care. Agencies serving rural Illinois counties can achieve full EVV compliance without relying on carrier coverage.
All 50 states are covered. Contact us for your state's specific EVV requirements.
Who Benefits
Home Health Agencies
Eliminate billing fraud exposure. Satisfy Medicaid audits with cryptographic evidence. Protect your license and revenue.
State Medicaid Programs
Reduce fraudulent claims at the source. Upgrade from GPS-based EVV to hardware-enforced proof of presence across your provider network.
Patients & Families
Know that the caregiver who arrived is the one who was scheduled. Confirmed identity before any interaction — for peace of mind and safety.
Frequently Asked Questions
Everything home health agencies and Medicaid programs need to know about VerifiedKnock EVV compliance.
Zero Personal Data Stored
VerifiedKnock stores no biometric data, no GPS coordinates, and no personally identifiable information. The caregiver's fingerprint never leaves the ATKey.Card hardware. Visit records contain only cryptographic proofs — not personal details.
Ready to Upgrade Your EVV Compliance?
Join our pilot program for home health agencies. Get hardware kits, onboarding support, and direct access to the founding team — at no cost during the pilot phase.