Start a signature ceremony

Pick the document, choose how you sign, then invite your COSignees.

What are you creating?

Certify my own document Timestamp and self-certify a document you hold — no other signers.

Document

Drop your document here

or tap to choose a file

PDF only (for now)

No document handy? Try a COSigna sample — both seal at the same speed: 1 page 350 pages

Participants (COSignees)

Pick a document first

Ceremony name (optional)

Your name (as organizer)

How do you want to set up the signing ceremony?

Reliability — order, deadlines, absences Signing order, deadline, and what happens if someone is unavailable.

Ceremony time limit

Require the ring to close within a set time after it opens.

The clock starts when you open the ring. Once it elapses, no one can sign or close — the ceremony expires.

Evidence add-ons Optional extra evidence: location, a drawn signature, a consent ceremony.

Ask for location

Request each signer's location, written into the block they sign.

Only a coarse location (≈ city level) is recorded for the certificate; precise coordinates never leave the signer's device — only a hash is committed. Self-declared.

Ask each COSignee for a drawn signature

Adds an optional signature pad after each consent selfie. The drawing is end-to-end encrypted and sealed into the proof — a self-declared mark, not an identity check and not legally binding on its own.

Require 4-gate consent ceremony

Each COSignee must read the document, declare their name, accept a binding consent statement, and acknowledge biometric consent before signing. The attestation is sealed into the chain block. Legal text: PLACEHOLDER — pending counsel review.

Inviting a notary or lawyer? See the lawyer guide →

Advanced proof & security Bitcoin anchoring and the unlock method.

Anchor to Bitcoin (OpenTimestamps)

The document hash (not the document) is submitted to the free OpenTimestamps service and permanently recorded in Bitcoin.

Learn more: opentimestamps.org

Security

Choose how COSignees unlock the ceremony.

Auto: the link unlocks automatically when the correct document is dropped.

6-digit code: COSignees enter a code you share with them separately.

Start signing ceremony Add a document, your name and a signing choice first

Open the ring — your consent photograph

As the initiator, you sign first. This is your link — link 1 of the chain. No predecessor to validate; the document hash QR will appear in your photograph.

Starting camera…

Head won't stay centred? Turn off Center Stage in Control Center → Video Effects (macOS/iPad auto-framing).

Signer Links

Signers

Show audit log

Audit log

Close the ring

All participants have signed. Tick the box below to close the ring.

—

Last participant in the ring

I Ring Certify the final participant and close the ring, committing the complete chain.

Checking this box commits the complete chain — this action is permanent.

Ring closed!

The ceremony is complete and independently timestamped — it can't be back-dated or altered.

Ceremony:
Document:

Verify the ring Share the proof Download your proof Capsule

Your proof Capsule

Keep these together, in the same folder — that folder is your Capsule: ① your original document ② the Ceremony Certificate, saved right next to it. The certificate carries everything: the proof as a PDF attachment, and clickable doors to re-verification, the shareable « Signed with COSigna » page, and the Bitcoin timestamp. Your Capsule verifies forever — with or without us.

Generate the photo certificate NOW — the decryption key lives in this session's link, and links get lost over the years. Freeze the human evidence into your folder today.

The offline verifier (keep it in your Capsule)

Ceremony Progress

Signed

Pending

Ceremony:

Consent photograph chain

Each photograph is a link — not a group photo.

No photos yet