No account, no app
The client gets a personal link by e-mail and signs on the phone. Unlimited sends.
Documents
Contracts and proposals signed, with proof anyone can check.
Upload the contract or proposal you already use, send it in two steps and the client signs on the phone. The PDF comes back with a signature certificate, a trusted timestamp and an ICP-Brasil digital seal.
Inside the process
A Flow step sends the document with the run's data and only moves on once everyone has signed.
Proof that doesn't depend on us
The QR code opens the public verification, and any PDF reader shows the file was sealed and not changed.
How it works
Prepare the model once
The PDF you already use becomes a model: who signs, what to ask each one, and where each signature goes.
Send in two steps
Who signs this time, then the data and the message, with a preview of the real PDF. Or let a Flow step send it.
The client confirms and signs
A 6-digit code by e-mail before signing. You see when it was opened and when it was signed.
The PDF comes back with proof
A signature certificate on the last page, a trusted timestamp and a digital seal over the whole file.
How we back every signature
A signature is only as good as its proof. Each person's answers five questions.
An electronic signature, valid between the parties that accept it under Brazilian law (MP 2.200-2/2001, art. 10, §2). Signers need no digital certificate: the ICP-Brasil certificate is Cadenio's seal over the file. Acts where the law requires the signer's own certificate need a qualified signature.
Was it really that person?
Before signing, they confirm their e-mail with a 6-digit code: having the link is not enough. If you enter the expected tax ID (CPF), what they type has to match.
Did they see what they signed?
The pages they viewed, the reading time and every confirmation they ticked, such as “I have read and understood the risks”, are recorded.
When, and from where?
Sent, opened and signed times, IP and device go on the certificate. The final PDF gets a timestamp from an independent authority.
Did the file change afterwards?
The whole PDF gets Cadenio's digital seal, with an ICP-Brasil certificate. Any change breaks the seal, and it can still be checked after the certificate expires.
Who can check it?
Anyone, without an account: the QR code opens the verification page, which compares the file without uploading it. Each signature has a signed proof to download.
Technical details
- Seal
- PAdES B-LTA under the ICP-Brasil AD-RB v1.3 policy (RSA-SHA256), with the certificate chain and revocation responses inside the PDF.
- Timestamp
- RFC 3161, from DigiCert, plus an archival timestamp over the validation data.
- Code
- 6 digits, valid for 10 minutes, 5 attempts. Only its hash is stored.
- Proof of each signature
- A JSON signed with the platform certificate, with no contact data. Check it with the public certificate (.pem) and OpenSSL.
- Evidence
- Full IP, browser, hash of the PDF sent and the consent text, kept with the document.
Where teams use it
Sales
An accepted proposal becomes a contract with the deal's data and goes out for signature in the same Flow.
Clinics
A consent form signed by the patient or a legal guardian, with the reading recorded.
Real estate
A lease with tenant and guarantor, each one's tax ID checked at signing.
Send your next contract or proposal with Cadenio
14 days free, no credit card.