Private Alpha · by invitation

Join the COSigna Private Alpha

Sign confidential documents the server never sees — mutual face attestation, Bitcoin-anchored, verifiable offline. We're onboarding a small group at a time. Add your email to the line.

We email you once your spot opens. No spam, ever — one address, one entry. The waitlist doesn't replace the open trial — you can also try COSigna right now.

Move up by referring — each friend who joins through your link bumps you up the line.

Your personal share link

Email a friend Share on X Share on LinkedIn
Report bug COSigna — 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