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SignSenders
Legal & Compliance

Electronic Signatures with Hardware Biometric Verification

Understand the legal validity, cryptographic security, and evidentiary standards that power SignSenders OTP + WebAuthn contract signing.

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Direct Summary & Overview

How do electronic signatures work on SignSenders?

SignSenders captures electronic signatures through a secure web portal protected by out-of-band 6-digit OTP verification and WebAuthn biometric authentication (Face ID, Touch ID, Windows Hello). Upon signing, the system compiles a sealed PDF document stamped with a cryptographic SHA-256 hash digest, client IP address, UTC timestamp, and biometric credential metadata, creating an immutable audit certificate.

Key Facts:
  • Recognized under IT Act 2000 (Section 10A)
  • WebAuthn Biometric Verification (Face ID / Touch ID / Windows Hello)
  • Cryptographic proof binding device biometric to document hash
  • Audit trail includes Credential ID, AAGUID, and signature algorithm

Important Product Scope: SignSenders facilitates contract creation and electronic signing. It does not replace notarization for real estate or wills, replace Aadhaar eSign or digital signature certificates (DSC), provide formal legal representation.

The 4 Pillars of Evidentiary Enforceability

How SignSenders establishes authenticity, biometric proof, intent, and integrity for every contract.

1. Signer Intent

Explicit affirmation and signature confirmation ensure the client intended to execute the agreement.

2. OTP Auth

Out-of-band 6-digit OTP links the signature to the recipient via their verified WhatsApp or phone channel.

3. WebAuthn Biometrics

Face ID / Touch ID cryptographic proof bound to the document hash prevents signature repudiation.

4. SHA-256 Integrity

Cryptographic hash digest seals the PDF, exposing any subsequent document modification immediately.

Common Questions

Frequently Asked Questions

Direct, transparent answers about SignSenders contract workflows, verification, and pricing.

It is an electronic contract execution process where the signer verifies their physical presence and intent using hardware biometrics (Face ID, Touch ID, or Windows Hello) in addition to an out-of-band OTP. The device creates a cryptographic proof that is bound directly to the contract's SHA-256 hash.
Pay As You Send • No Monthly Subscriptions

Ready to create and sign your next contract?

Join independent freelancers using SignSenders. Get 1 free contract credit upon signing up, then pay as you go at ₹149 per contract.

Create Free Contract (1 Credit Included)View Pricing (₹149)
1 Free Credit at SignupOut-of-Band 6-Digit OTPWebAuthn Biometric Seal