Create a signing ceremony
Pick the document, choose how you sign, then invite your COSignees.
You're on a phone — and that's all you need. You can complete this here: sign, then share the countersigning link from this device. Your COSignees still need the document itself — share it from this device too.
Add the document first: this card opens next.
Transparent — anyone holding the link sees the organizer and the list of COSignees, during and after the ceremony.
Standard — during the ceremony, only a count (“2 of 4 signed”); the full record appears once it closes.
Discreet — only a count; the file’s name never leaves your device, and no public timestamp is made by default.
This choice is permanent once the ceremony launches.
Add the document first: this card opens next.
Order and time limit Nothing changes for your COSignees.
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. The clock starts when you open the ring. A removed COSignee is recorded in your own ceremony history, not in the cryptographic proof; the ring closes only if at least one COSignee has signed.Extra checks One more step for each COSignee.
Request each COSignee'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.Choose how COSignees unlock the ceremony.
Stronger consent Read, name, accept, confirm: four actions before signing.
As the organizer, you sign first — you are the first COSignee in the ring. No predecessor to validate; the document hash QR will appear in your photograph.
Your photo on this computer opens the certification. The document's code appears in the picture, so your phone can check it next.
Head won't stay centered? Turn off Center Stage in Control Center → Video Effects (macOS/iPad auto-framing).
The ring closes when the organizer confirms it. Nothing closes on its own.
Checking this box commits the complete chain — this action is permanent.
I certify that the loop is closed and that this signature ceremony has been completed by every participant still in the ceremony
This records an alert, and the ring stays open.
For ceremonies with 3 or more participants, the closing photo seals the loop: you confirm that you reviewed the complete chain of signatures.
This photo binds the final participant back to you, ensuring the ring is tamper-evident and complete.
This photograph shows that the same person who opened this ring is the one closing it — after watching every other COSignee sign. Unlike your earlier photographs in this ceremony, no one signs after you: this one is sealed into the record for whoever verifies the proof later.
Head won't stay centered? Turn off Center Stage in Control Center → Video Effects (macOS/iPad auto-framing).
This step is optional — declining does not stop the ring from closing. Your photograph is always encrypted on this device before it's sent; COSigna cannot read it. Like every photograph in this ceremony, it declares who you are — it does not verify it.
Ring closed!
The ceremony is complete. Bitcoin anchor pending — confirmation expected within hours. Until then the timestamp is COSigna's own.
Keep these together, in the same folder — that folder is your proof package: 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 proof package verifies 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.