Defense

“Contracts this sensitive cannot sit on anyone else's servers.”

Sign on infrastructure you control. The server never sees the contract.

A Simple Electronic Signature under eIDAS. Self-hosting on your own domain is set up with you.

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How it works

  1. Run COSigna on your own domain (the Enterprise image).
  2. Parties sign in order, each validating the document and the previous COSignee.
  3. Keep a certificate that verifies offline, even air-gapped.

Blind server: it never holds the document or a plaintext face.

What COSigna does not do

It claims no accreditation or security clearance. It does not verify identity: names are declared by the organizer.

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COSigna — patent EP3665600B1 · US11531746B2 · FR3070079B1
Report bugCOSigna — a Cryptographic Ring of Mutual Consent · The ring is strong because the loop is closed.The ring is strong because the loop is closed.COSigna