NeuroSign: sign with a face, verify without us

One story: a bank officer sends a loan agreement, the borrower signs on a phone, anyone verifies the result offline.

Start the story: send a loan agreement Jump to the signer's phone

1 Sender

Upload, add signer, policy picks the check, place the field, send. 4 steps.

2 Signer (phone)

Review, verify and sign in one step, evidence file. 2 screens to a signature, then the result.

3 Verify offline

Drop a signed file, get five checks. Try the two tampered samples.

4 Audit certificate

One readable record: identity check, integrity, time, log position.

Signer path next to the market

Rows without a tag are estimates from public documentation and help pages (research files 02 and 03). The row tagged Measured comes from one live run on 08.10.2026, one account, not an average. The NeuroSign row is counted live in this prototype.

Product	Screens / clicks to a signature	Identity check
DocuSign	about 7 clicks without identity check	separate step; on desktop a second device and a code typed back
Adobe Acrobat Sign / Dropbox Sign	5 to 6 clicks	separate or paid add-on
PandaDoc	4 to 5 clicks	plus 4 screens when ID check is on
OneSpan Sign	about 6 screens before signing	separate step, then "Continue to signing"
Aadhaar eSign (typical platform)	4 to 5 screens	2 domain changes, 3 OTP per hour limit
Zoho Sign (self-sign, measured 08.10.2026) Measured, 1 live run	4 screens, 8-9 clicks plus a drag and a typed signature (6-7 clicks after the first signature). The remote-signer path (link from an email) was not measured.	none in the self-sign path; identity is the account login; evidence is email, IP and time
NeuroSign prototype	2 screens and 2 taps until the signature is recorded; the 3rd screen only shows the result	same step as signing, no code, no second device, no domain change

How to read the tags

Computed herecalculated for real in this page Simulated herea mockup; the live face check is planned as real: the NV KYC widget can be attached in the signer step when the optional nv-kyc-config.js is present, and without it the camera and the engine stay simulated Pilot, not in MVPno working flow

1 DocumentUpload
2 SignerWho signs
3 Check and fieldPolicy and place
4 SendReview

Step 1 of 4: Upload the document

Drop a PDF here or click to chooseSample loan agreement is already loaded. Any file works: its SHA-256 is computed in your browser.

Document class The class decides the identity check. The sender cannot weaken it.

Loaded document

Name
Size
SHA-256

This hash is shown to the signer and written to the evidence record.

Next: add signer

1 DocumentDone
2 SignerWho signs
3 Check and fieldPolicy and place
4 SendReview

Step 2 of 4: Add the signer

Full name Email or phoneThe link goes here. The link alone does not sign: the live check does. Signing order

Back Next: check and field

1 DocumentDone
2 SignerDone
3 Check and fieldPolicy and place
4 SendReview

Step 3 of 4: Identity check and signature field

Click the page to move the signature field.

Back Next: review and send

1 DocumentDone
2 SignerDone
3 Check and fieldDone
4 SendReview

Step 4 of 4: Review and send

Document
Class
SHA-256
Signer
Identity check
Link valid for: 72 hours, one active session at a time
Storage: Planned: encrypted at the bank (X-Wing + AES-256-GCM), kept 7 years (demo value, set by bank policy). Not happening in this prototype.

Back Send for signature

Sent. Waiting for the signer.

Created
Waiting for signer 1
Signed

Signer link (one-time session, expires in 72 hours):

https://sign.demobank.example/s/7Qm2x9...kd3

Open signer link (phone view)New request

Email and SMS delivery are not part of the demo.

Demo Bank
Signature request

1 of 3

Review and sign

From Priya Sharma, Demo Bank. Loan agreement for Arjun Mehta.

SHA-256 Planned: encrypted, kept 7 years

Consent wording: draft text for this prototype, not reviewed by a lawyer.

Demo Bank
Verify and sign

2 of 3

Simulated camera

Face found
Live person
Reference match (simulated)

All three checks above are simulated. Where the reference image comes from is an open question; this match is not accepted as a requirement until it is answered.

Your signature is recorded when this check passes. No code to type.

Live widget: NV KYC widget

Demo Bank
Done

3 of 3

Signed

Document
Signer
Method: Live face check simulated
Time
SHA-256

Open certificate

A simple electronic signature with an identity check record. It is not an Aadhaar, UAE PASS or national digital signature, and it states no legal status.

Prototype: the evidence file is real JSON with sample values. then verify it offline, change one character and verify again. Open the verification page.

Demo Bank

This link has expired

For your security, signing links stop working after a while. Nothing was signed. The document and sender are not shown here.

See the certificate (not completed) Back to the demo

Demo Bank

Back to the demo

Demo Bank

You declined to sign

The sender has been told. A record of this is kept in the audit certificate as "not completed". No signature was recorded.

See the certificate Back to the demo

Presenter panel

Not part of the signer's screen. Choose what the simulated check does, then step through.

Outcome of the live check Passes Liveness fails (3 tries, then another way) Wrong person (link forwarded). Simulated only: the reference image source is open (Q3) Replay: a capture from another document's session Replay: the same session id used twice Camera blocked

Other screens

Not shown in this prototype: the sender-side messages of the negative cases. "Restart signer" below is a demo reset, not a signer feature; in the product a restart does not clear the three attempts.

Restart signer

Measured in this prototype

2screens to signature

0taps to signature

0seconds

Taps counted from the first screen until the signature is recorded. The browser's own camera permission prompt is not counted. Target: at most 2 screens and 3 taps until the signature is recorded (the 3rd screen shows the result), median 60 s on a phone in a pilot.

Nothing to install, nothing to type

No second device and no code typed back (DocuSign desktop path).
No account, no domain change on the face path.
Consent sits next to the button: no separate consent screen.

Verify a signed document

Works without our server and without a network. Everything below runs in this page, which makes no network request and uses system fonts.

Drop the signed file and the evidence fileBoth at once, or one by one. Files stay in your browser.

Tip: on the signer's last screen, download the evidence file and the signed sample document, drop both here, then change one character in the sample document and drop it again.

Signing certificate

SAMPLE DATA

Verify offline

NeuroSign: sign with a face, verify without us

1 Sender

2 Signer (phone)

3 Verify offline

4 Audit certificate

Signer path next to the market

How to read the tags

Step 1 of 4: Upload the document

Loaded document

Step 2 of 4: Add the signer

Step 3 of 4: Identity check and signature field

Step 4 of 4: Review and send

Sent. Waiting for the signer.

Review and sign

The widget reported a result

Signed

This link has expired

You declined to sign

Verify a signed document

Package

Signing certificate