Enter your email and we'll send you a one-time sign-in link. No password needed.
If you've set up a passkey on this device, you can sign in instantly with biometrics — no email link required.
Sign-in isn't open yet. You can run, sign and verify ceremonies today without an account — saving them to an account will arrive shortly.
You can also get a sign-in link by email:
We've sent a sign-in link to your inbox. Open it on this device to continue.
Hello, —
Signed in as —
Used to pre-fill your name. A label, not verified identity.
1 signature = 1 credit. Opening a ceremony is free. Self-notarization (signing your own document) is 1 credit.
My ceremoniesSystem follows your device setting.
Guided keeps ceremony setup to the essentials. Full shows every option.
We'll try to notify this device when a ceremony needs your attention. Off by default.
Receive an email when your ceremony's Bitcoin anchor is confirmed. On by default.
Top up your balance. 1 signature = 1 credit. Credits never expire.
You earn credits when someone you invited signs in and completes their own first ceremony.
To invite someone, open a ceremony in “Share COSigna” mode (/initiate?ref=1) and send them the link.
A passkey lets you sign in without an email link. Name each one so you can tell your devices apart.
Passkeys are coming soon — sign in without an email link, once COSigna is on its final domain.
Each browser you sign in from appears here. Revoking signs that browser out.
Download everything we hold about your account — a complete, machine-readable copy (GDPR Art. 15/20).
Permanent. Your ceremonies' signed evidence is retained where the law requires it (Art. 17(3)(e)), but your account becomes non-addressable and drops off your dashboard. You will be signed out and returned to the home page.
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