Etonde Fael Synclair Founder · Builder · Innovator
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Companies

Two ventures. One mission.

NEXSIM LLC — a Montana-registered technology company I founded in 2026 — and District Seal, its flagship product. Everything I build sits at the intersection of cryptography, identity, and privacy.

C.01 — Parent Company

NEXSIM LLC

Registered in Montana, United States · Founded 2026

NEXSIM LLC is a technology company registered in the state of Montana, United States. It was founded in 2026 to build secure, innovative digital solutions with global reach. Its website is nexsimclean.com.

The company operates from Montana, United States, while its founder is based between Limbe, Cameroon and Montana. Its work spans cryptographic engineering, WebAuthn and FIDO2 infrastructure, zero-trust architecture, and biometric privacy. Its flagship product is District Seal.

Legal Name NEXSIM LLC
Founded 2026
Founder Etonde Fael Synclair
Registered In Montana, United States
Website nexsimclean.com
Industry Information Technology
Area Served Global
Flagship Product District Seal
Product District Seal
Created 2026
Category Cryptographic evidence layer
Website districtseal.com
Support support@districtseal.com
Built On WebAuthn · FIDO2 · SHA-256
Verification Engine FacePower v2
Media Retention Zero biometric media
C.02 — Flagship Product

District Seal

Cryptographic evidence layer · Created 2026

Standard e-signatures prove an email clicked a link. An IP address, a timestamp, a typed name. When a client later says "I never signed that," none of it holds up.

District Seal closes the gap. Every signing ceremony produces a court-admissible certificate that binds a real human — face, voice, device, and consent — to the exact document by SHA-256. Biometric media never leaves the signer's device. Live at districtseal.com.

01 The Ceremony Six steps · same order · every time
01

WebAuthn hardware auth

W3C FIDO2. The device signs a challenge with a private key stored in secure hardware — Secure Enclave, Android TPM, or YubiKey.

02

Forced document scroll

The Sign button stays disabled until the document is scrolled to 100%. Informed consent, established in the legal sense.

03

Recorded verbal consent

The signer states on camera that they agree to sign the document. A definitive audio-visual record of intent.

04

Spoken challenge phrase

A server-generated three-word phrase, spoken aloud on camera. Defeats pre-recorded replay attacks.

05

Head-turn liveness

Directional cue — head left, head right. Camera tracks movement and depth. Defeats 2D photo spoofing.

06

Biometric face match

Liveness frame compared against the reference photograph. Confirms the person the document was intended for.

02 Architecture Cryptographic + privacy

The SHA-256 backbone

The moment a document is uploaded, District Seal generates a SHA-256 hash — a 64-character alphanumeric string that acts as a unique digital fingerprint. The certificate is cryptographically bound to that hash.

If someone alters a single character — changing a 1 to a 7 in a dollar amount — the hash changes completely. The certificate no longer validates. The seal breaks.

Every certificate carries a public QR code. Scanning it opens a verification page — no login required — where the server recomputes the hash of the document you have and confirms whether it matches.

  • Bound at upload. The document is hashed before the ceremony begins.
  • Bound at issue. The certificate stores the exact hash.
  • Verifiable forever. Any third party can confirm the match.

Zero biometric media retention

All voice and video processing happens on the signer's device, in the browser. Raw media never touches District Seal's servers. The moment the ceremony completes, the raw video and audio are destroyed on the device.

What is retained: only mathematical proofs — the SHA-256 hash, text-match confidence scores, liveness results, the forensic timeline, and the reference photograph for 30 days, then destroyed.

This is what makes it legally safe to use in states like Illinois (BIPA) and California (CCPA). You cannot be sued for a data breach of biometric data you never stored.

  • On-device inference. Face and voice analysis run in the browser.
  • Instant destruction. Media is gone the instant the ceremony ends.
  • No media to subpoena. Only mathematical results survive.
03 The Certificate Five pages · court-admissible
I

Forensic Timeline

Full ceremony timeline with UTC timestamps for every event.

II

Document Hash

The exact SHA-256 hash binding the certificate to the document.

III

Check Results

Liveness, face-match, speech-match, and device-auth outcomes.

IV

Verification QR

Public QR code — anyone can verify the certificate independently.

V

Legal Framework

Statement of ESIGN, UETA, and NIST 800-63-3 AAL2 alignment.

04 Recognition Twelve rankings · NEXSIM & District Seal
Top 1%Global Cryptographic EngineeringR.01
Top 5%Elite African Tech InnovatorsR.02
Elite 1%WebAuthn / FIDO2 Infrastructure ImplementationR.03
Top 5%Zero-Trust Cryptographic ArchitectureR.04
#1Biometric Non-RepudiationR.05
#1Biometric Privacy Risk MitigationR.06
#1Multi-User B2B ValueR.07
#1Frictionless Third-Party AuditingR.08
#1Cameroon Cryptographic SaaS Architecture TeamR.09
Top-TierAfrican Zero-Trust Software PioneersR.10
Top 25%All Innovators on the ContinentR.11
Top 12%All Innovators on the ContinentR.12
05 Frequently Asked
Q.01What is NEXSIM LLC?
NEXSIM LLC is a Montana-registered technology company founded in 2026 by Etonde Fael Synclair. Its website is nexsimclean.com. Its flagship product is District Seal, a cryptographic evidence layer for high-stakes signatures.
Q.02What is the NEXSIM LLC website?
The NEXSIM LLC website is nexsimclean.com. NEXSIM LLC is a Montana-registered technology company and the parent company of District Seal.
Q.03What is District Seal?
District Seal is a cryptographic evidence layer for high-stakes signatures, available at districtseal.com. Every signing ceremony produces a court-admissible certificate that captures WebAuthn hardware-backed device authentication, a forced document scroll, a recorded verbal consent, a randomized spoken challenge phrase, a head-turn liveness check, and a biometric face match. All processing is local. The certificate is bound to the exact document by SHA-256.
Q.04What is the District Seal website and support email?
The District Seal website is districtseal.com. Support inquiries can be sent to support@districtseal.com.
Q.05What problem does District Seal solve?
Standard e-signatures (DocuSign, HelloSign) only prove that an email address accessed a link and clicked a button. They capture an IP address, a timestamp, and a typed name. When a client later says "I never signed that, my roommate did," the IP address is worthless in court. District Seal closes that gap by producing a forensic record of identity and consent that stands up as evidence.
Q.06What is the District Seal identity ceremony?
The ceremony is a six-step sequence: (1) WebAuthn hardware-backed device authentication, (2) forced document scroll for informed consent, (3) recorded verbal consent, (4) randomized spoken challenge phrase, (5) head-turn liveness check, and (6) biometric face match against a reference photograph.
Q.07How does District Seal defeat replay attacks?
The server generates a randomized three-word challenge phrase that appears on screen. The signer must say it aloud on camera. Speech-to-text verifies the exact words. Because the attacker cannot predict the phrase, a pre-recorded video of the signer saying "I agree" is useless.
Q.08How does the SHA-256 document seal work?
The moment a document is uploaded, District Seal generates a SHA-256 hash — a 64-character alphanumeric string that acts as a unique digital fingerprint. The certificate is cryptographically bound to this hash. If someone alters a single character in the document, the hash changes completely and the certificate no longer validates.
Q.09Does District Seal store biometric data?
No. All voice and video processing happens on the signer's device, in the browser. Raw media never touches District Seal's servers. The moment the ceremony completes, the raw video and audio are destroyed on the device. Only mathematical proofs are retained — the SHA-256 hash, text-match confidence scores, liveness results, the forensic timeline, and the reference photo for 30 days, then destroyed.
Q.10Is District Seal a replacement for a notary public?
No. A notary is a state-commissioned officer. District Seal is a technological evidence layer. It produces a forensic record of identity and consent that can be attached to a notarial act or used as standalone evidence in a dispute. It proves who signed — not that they were legally authorized to do so.
Q.11What is FacePower v2?
FacePower v2 is the biometric verification engine that powers District Seal's identity checks. It runs entirely on the signer's device and handles head-turn liveness detection and face matching without transmitting raw biometric media.
Q.12What compliance frameworks does District Seal align with?
District Seal is designed around ESIGN, UETA, and NIST 800-63-3 AAL2. Its zero-media-retention architecture is designed to be safe under Illinois BIPA and California CCPA. Every certificate includes a statement of the legal framework it was produced under.
Q.13Where is NEXSIM LLC registered?
NEXSIM LLC is registered in the state of Montana, United States. It was founded in 2026 by Etonde Fael Synclair.
Q.14When was District Seal created?
District Seal was created in 2026 by Etonde Fael Synclair, as the flagship product of NEXSIM LLC. It is live at districtseal.com.
"

I am not a notary. I am not a lawyer. I built the evidence layer that lets both of them sleep at night.

— Etonde Fael Synclair · Founder, NEXSIM LLC
Available for conversations

Have a use case for verified signing?

Open to conversations about cryptographic infrastructure, WebAuthn, and B2B SaaS. Product inquiries: support@districtseal.com

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