Private signing prototypeSpecial Power of AttorneyLocal session

Sami Ullah · witness signing

Review, sign, then capture your thumbprint.

This prototype guides capture from the phone’s rear camera. It analyses the live camera feed; it does not accept a normal photo upload as the primary path.

Step 1

Review the document

Open full PDF

Read the full Special Power of Attorney before continuing. The final signing service will make the document and its hash immutable before each signer acts.

Step 2

Add your signature

Draw your usual signature.

Step 3

Build a right-thumb ridge scan

Keep the phone steady about 15–25 cm away. The scanner collects five sharp ridge patches from the centre, then asks you to roll the thumb slightly left and right. It does not require the complete thumb outline in one frame.

1
Centre0/5 frames
2
Roll left0/5 frames
3
Roll right0/5 frames

Show the centre of the fingerprint pad inside the smaller oval. The nail should face away from the camera.

Live ridge patch
Camera is off
Light
Focus
Ridge area
Motion

Start the camera when you are ready. Frames remain in this browser and are never uploaded by this prototype.

Camera diagnostics

The log contains numerical measurements only. If needed, you can explicitly save the most recently rejected patch to your own phone; it is never uploaded automatically.

Start the camera to record diagnostics.

Step 4

Review & finalise

The final implementation will place approved fields into the PDF, generate a document hash and signer audit record, then lock the completed copy. This local prototype deliberately does not transmit or finalise a legal document.

Complete the signature and guided capture first.