Op'n Cezami
"It’s not about replacing paper certificates. It’s about protecting integrity."
Op'n Cezami is a modern system designed to help experts issue tamper-proof, cryptographically signed documents without abandoning the physical format.
The Problem
Traditional paper certificates can be lost, damaged, forged, or digitally manipulated. In the world of fine instruments, reliance on paper alone is a liability.
The Solution: LegatoKey
We bind the physical and digital worlds via secure QR codes.
- ✓ A physical certificate to hold.
- ✓ Cryptographic proof your signature hasn't been faked.
- ✓ Verifiable by anyone via LegatoLink.
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Tour the Interface
Swipe to explore workflow
Transparent by Design
Self-sovereign • Open Source • "Don't Trust — Verify"
No Vendor Lock-in
You stay independent. No forced subscriptions, no cloud dependencies. The software runs locally on your machine.
Universally Verifiable
Musicians can verify authenticity instantly using the free LegatoLink app—even without internet access.
Image + Text Protected
Our cryptography covers visual content too. Proof that the photos on the certificate haven't been altered.
Core Edition
Always Free & Open Source (LGPL v3)
- ▪ Create cryptographically signed certificates
- ▪ Generate LegatoKey QR codes
- ▪ Full commercial or personal use
- ▪ Auditability: Inspect the code anytime
Power Tools
For High-Volume Ateliers & Institutions
- ✦ Batch Signing: Sign hundreds of certificates in minutes.
- ✦ Tamper-Evident Audit Trail: A local blockchain-like log for legal-grade evidence.
- ✦ Global Usage Insights: Geographic analytics on where your LegatoKeys are verified.
- ✦ Priority Support: Direct technical assistance.
Need help with design or integration?
We can help you streamline your workflow, design custom certificate layouts, or integrate LegatoKey into your existing branding.
Contact Frederic LM: andrelevi@ruederome.com