Our Services
PDF Digital Blockchain Signature
We provide a modern, tamper-proof way to sign PDF documents using blockchain technology. Each signature is encrypted, timestamped, and written to the blockchain, creating a permanent and verifiable record that cannot be altered. Whether you’re signing a single contract or managing multi-party agreements, our system ensures that every signature is authentic, legally valid, and easy to verify.
Contract Designer
Create professional, legally-binding contracts with our intuitive drag-and-drop designer. Build custom templates with your branding, define signature fields, add clause libraries, and manage multi-party agreements—all with built-in cryptographic signing and tamper-proof audit trails.
✨ Test it here, no sign up!
Try our AI-powered clause generator • No registration required • Play around and see the magic!
Click to expand and create your own custom clause instantly!
Generate Your Own Clause
Each US state has different contract laws. Select your state for accurate legal language.
Be as specific as possible for better results. The AI will generate both the clause title and content.
These are examples of discriminatory, racist, sexist, or otherwise illegal requests. Our AI will detect and warn you!
📄 Context (Automatically included in AI prompt)
Generating your clause...
This may take 10-30 seconds
Error generating clause
⚠️ Legal Warning: This request contains illegal content!
The clause shown below is a legal alternative (if possible). Your original request cannot be enforced in a contract.
Secure document storage Amazon S3 Bucket
Amazon Simple Storage Service (S3) is a highly durable, scalable object storage service. XSigi uses S3 buckets to securely store your encrypted documents with fine-grained access control, server-side or client-side encryption, versioning, and lifecycle policies to retain what you need and purge what you don't.
KYC ID & Location Verification
Verify customer identity with secure ID document checks, live geolocation capture, and audit-ready evidence.
Optional video chat provides real-time presence and liveness verification, with transcripts and artifacts stored for compliance.
CRYSTALS-Kyber: The Key to Post-Quantum Encryption
Deploy lattice-based, NIST-selected CRYSTALS-Kyber for fast, quantum-resistant key encapsulation securing documents and secrets against future attacks.
- Quantum-resistant key exchange
- Low bandwidth, high performance
- Future-proof secure workflows
Integrated into XSigi’s encryption pipeline to protect data today—and after large-scale quantum computers arrive.
ZIP Encryption
Protect your files with next-generation encryption that combines public/private key technology and the ChaCha20-Poly1305 algorithm, delivering both speed and uncompromising security. This advanced method ensures that only the intended recipient can unlock the contents of your ZIP file, while every attempt at tampering is immediately detectable.
TEXT Encryption
Use the new XSigi Envelope v1 format for text encryption combining three powerful cryptographic techniques:
- Ed25519 signature — ensures authenticity & integrity, letting recipients verify the sender.
- X25519 sealed boxes — provides confidentiality so only the intended recipient can decrypt.
- Armored JSON — wraps encrypted data in readable JSON for easy transport & embedding.
Together, they deliver a portable, verifiable, and secure text container ready for modern workflows.
How XSigi works
Not a fan of reading? No worries — our Video Explainer section has you covered!