HashSign: Sign & Audit Docs

HashSign: Sign & Audit Docs brings enterprise-grade security to your mobile workflow. Secure your document signing with AI contract audits and digital notarization in seconds. Built for real estate professionals, legal teams, freelancers, and business owners, HashSign combines legally binding electronic signatures with intelligent contract analysis and immutable Hedera blockchain timestamping.

ABOUT HASHSIGN

Traditional e-signature apps only capture a basic signature on a PDF. HashSign goes further by transforming standard document signing into a verifiable, risk-aware workflow. Before you commit to an agreement, our integrated AI assistant reviews the text to flag hidden obligations. Once signed, every PDF is sealed with a cryptographic SHA-256 hash and anchored directly to the public Hedera ledger for permanent proof of execution.

KEY FEATURES

* Legally Binding Document Signing
Import any PDF contract, real estate agreement, lease, proposal, or NDA directly from your device. Place your signature, initials, and date stamps smoothly on any page and export a court-ready signed PDF complete with a detailed cryptographic audit certificate.

* AI Contract Audit and Risk Review
Never miss critical fine print again. Before completing your document signing, run an instant AI contract audit. HashSign scans your agreement to highlight unusual clauses, missing protections, auto-renewal traps, indemnification risks, and key deliverables in plain, easy-to-understand language.

* Hedera Blockchain Digital Notarization
Every notarized agreement generates a unique cryptographic fingerprint anchored to the Hedera Consensus Service (HCS). Anyone can independently verify the authenticity of your file, proving mathematically that the contract existed at an exact second and has not been altered by a single byte.

* Post-Quantum Cryptographic Security
Future-proof your sensitive records against emerging threats. HashSign integrates NIST-standardized post-quantum digital signature algorithms (ML-DSA / Dilithium) alongside industry-standard hashing to protect long-term real estate deeds, intellectual property agreements, and corporate records.

* Real-Time Messaging and @Username Handles
Claim your unique @username handle in Settings to connect with clients, realtors, and counterparties without exposing personal phone numbers. Send messages and share executed contracts directly inside encrypted chat threads with real-time push notifications and live unread message badges.

* Encrypted Document Vault and Biometric Lock
Organize all of your signed PDFs, AI audit reports, and blockchain transaction receipts in a centralized vault protected by Face ID or fingerprint biometric authentication.

* Custom App Icons and Adaptive Themes
Personalize your workspace with clean dark and light modes, plus six custom home screen app icons including Obsidian Dark, Midnight OLED, Cyber Cyan, Electric Violet, Neon Rose, and Emerald Mint.

WHY CHOOSE HASHSIGN?

* For Real Estate Agents and Brokers: Close purchase agreements, disclosures, and lease addendums on the go with instant client notifications.
* For Small Business Owners and Founders: Execute vendor agreements, NDAs, and contractor scopes with built-in AI legal review.
* For Freelancers and Consultants: Protect your scope of work and payment terms with tamper-proof digital notarization.

Download HashSign today to upgrade your document signing, automate your contract audits, and protect every agreement you sign.

Recent changes:
• End-to-End Encrypted 1:1 Chats: On-device X25519 + AES-256-GCM encryption with Safety Numbers & key rotation.
• Biometric Face Signature (US Pro): Bind live on-device facial verification to your PDF's SHA-384 & Hedera HCS audit trail. Invited signers complete it free!
• US ID Verification (US Pro): Verify your ID on-device to earn the Verified Signer shield.
• HashSign Support Assistant: 24/7 in-app help & 1-tap support tickets in Settings.