Signature Verification and Digital Signature via e-Notariado

Context Note: This content describes Brazilian notary and registry law (Direito Notarial e Registral Brasileiro).

Title

Signature Verification and Digital Signatures: e-Notariado, Gov.br, and Extrajudicial Validation

Signature Verification and Digital Signatures: e-Notariado, Gov.br, and Extrajudicial Validation

This article answers

• Do real estate registry offices accept documents signed via gov.br in person at the counter?
• How does the registry office identify whether a gov.br signature is Silver or Gold level without the person logging in?
• What is the procedure for authentic signature verification in the digital environment?
• What is the difference between signature verification by comparison and an e-Notariado digital certificate?
• How do you validate the authenticity of a digital signature on a private document?

In summary

• Signature verification and digital signatures allow validating the authorship of legal acts in electronic media with full legal security Lei nº 8.935/1994, art. 1º.
• Electronic documents printed on paper lose their cryptographic attributes and require notary materialization (conversion into certified physical paper) before being presented at physical counters.
• The e-Notariado platform executes notary acts and digital signature verification through videoconferencing and a free notary digital certificate Provimento CNJ nº 149/2023, Livro II.
• The use of gov.br digital signatures at Silver or Gold levels holds legal validity for various private transactions, but requires verification in native digital format.

Do real estate registry offices accept documents signed via gov.br in person at the counter?

No. Real estate registry officials cannot accept printed paper sheets containing only the graphic representation of a gov.br signature. The electronic signature exists exclusively inside the original electronic file in PDF format Lei nº 14.382/2022, art. 3º. When you print a digitally signed document, the cryptographic keys are not transferred to the paper. The code printed in the footer serves only as an identifier, but does not substitute the verification of the data embedded within the file.

For a contract signed electronically through the gov.br portal to be presented in person at the real estate registry counter, it is necessary to first perform the notary materialization of the document at a notary public office (Tabelionato de Notas) Lei nº 8.935/1994, art. 6º. In this procedure, the notary public accesses the native digital file, confirms the validity of the signatures on official verifiers, prints the paper copy, and attaches the notary certificate of materialization.

If your intention is to submit the document directly without going to the physical counter, transmission must be carried out through the Electronic System of Public Registries (Sistema Eletrônico dos Registros Públicos — SERP) or through registry electronic portals Lei nº 14.382/2022, art. 3º. On these platforms, the original digital file maintains all cryptographic properties, enabling direct verification without the need for paper. To understand jurisdiction in the digital environment, read our guide on notary acts on e-Notariado.

For the service of signature verification and digital signatures, preserving the electronic original is an essential requirement to prevent any suspicion of content tampering in the instrument.

How does the registry office identify whether a gov.br signature is Silver or Gold level without the person logging in?

The notary public office or real estate registry does not need to request login credentials, passwords, or personal access data from citizens to validate their account level. Every advanced electronic signature issued by the gov.br portal embeds structured metadata and a digital certificate inside the internal structure of the PDF file.

Upon receiving the native digital file, the registry clerk submits the document to the Compliance Verifier maintained by the National Institute of Information Technology (Instituto Nacional de Tecnologia da Informação — ITI) or to the official Federal Government portal. These verifiers analyze the certification chain embedded in the document and automatically report whether the account used by the signatory was Bronze, Silver, or Gold level.

Identification occurs through the verification of the public key associated with the signatory:

• Silver Account: The system indicates validation performed via facial biometrics from the National Driver's License System (Sistema Nacional de Carteira de Habilitação — SenaTran) or through credentials from partner banking institutions.
• Gold Account: The verifier confirms biometric verification conducted against the Electoral Justice database or the use of an ICP-Brasil digital certificate.
• Bronze Account: The verifier indicates a basic level of registration validation, which lacks the security level required for most extrajudicial real estate and corporate transactions.

Thus, the verification process for signature verification and digital signatures is fully transparent and autonomous. The notary office system attests to the authenticity and integrity of the signature without violating user privacy or requesting credentials from the government platform.

What is the procedure for authentic signature verification in the digital environment?

Signature verification and digital signatures by authenticity in the electronic environment occur through the e-Notariado platform, regulated by the National Council of Justice (Conselho Nacional de Justiça — CNJ) Provimento CNJ nº 149/2023, Livro II. This act guarantees that the citizen signed the document in the remote presence of the notary public, with identity verification via videoconferencing.

The detailed step-by-step procedure includes the following operational stages:

• Obtaining the e-Notariado certificate: You request the issuance of the notary certificate from an accredited notary public office. The certificate is free of charge and valid for three years.
• Document submission: The private instrument is uploaded into the e-Notariado signature workflow.
• Conducting the videoconference: The notary public schedules the remote session to read the terms of the document, confirm the biometric identity of the declarant, and record express consent to the text.
• Signing the document: You sign the file using the e-Notariado application on your smartphone or computer.
• Notary attestation: The notary concludes the act by applying their digital signature with an ICP-Brasil certificate, producing a document endowed with public faith and full legal efficacy Lei nº 10.406/2002 — Código Civil, art. 215.

To learn more about the steps of this service, read our text on e-Notariado and notary electronic signatures.

What is the difference between signature verification by comparison and an e-Notariado digital certificate?

The fundamental difference between the traditional paper method and the electronic medium lies in the method of verifying the graphic mark and the technology protecting the document Lei nº 8.935/1994, art. 1º.

In signature verification by comparison (reconhecimento de firma por semelhança), the individual previously appears at the notary public office, fills out a signature card, and registers their physical handwriting. When a paper document reaches the counter, the clerk visually compares the handwriting on the document with the signature on the file card. If the forms match, the notary office affixes a label and a fiscal control stamp.

In the system of signature verification and digital signatures via e-Notariado certificate, there is no visual comparison of handwritten strokes on paper. The e-Notariado certificate is a digital identity linked to the Individual Taxpayer Registry (Cadastro de Pessoas Físicas — CPF) and biometrically validated against official databases maintained by the Notarial College of Brazil (Colégio Notarial do Brasil) and the National Council of Justice (Conselho Nacional de Justiça — CNJ) Provimento CNJ nº 149/2023, Livro II.

The digital signature based on the e-Notariado certificate uses cryptographic mathematics. If the electronic document is altered by even a single character after signing, the cryptographic keys break automatically and validation fails. Traditional physical signatures lack this self-protection mechanism against erasures and subsequent text additions.

How do you validate the authenticity of a digital signature on a private document?

To validate a private document that has undergone signature verification and digital signatures, you must use official public verifiers maintained by supervisory bodies in Brazil.

You should not rely on screenshots, image receipts, or paper reports. Genuine verification requires analyzing the original digital file.

Follow the steps below to verify file authenticity:

• Access the official verifier: Open the ITI Verifier website (`validar.iti.gov.br`) or the e-Notariado portal verifier (`e-notariado.org.br`).
• Upload the file in PDF format: Upload the original document without any subsequent editing.
• Examine the report results: The system processes the file and displays the individual status of each signature present in the document.
• Verify essential requirements: Confirm that the digital certificate was valid at the time of signing, that the certification chain is recognized, and that no text modifications occurred after signature application.

If the verifier indicates a hash mismatch, certificate revocation, or content alteration, the document loses certainty regarding its legal integrity and must not be accepted for property transactions or public registration. In situations requiring rigorous proof of a file's existence on the web, drafting a Notary Act (Ata Notarial) serves as the ideal instrument to establish digital facts.

Document checklist

To perform signature verification and digital signatures or formalize electronic acts before a notary public office, prepare the following items:

• [ ] Official photo identification document (valid RG, CNH driver's license, or Passport).
• [ ] Enrollment in the Individual Taxpayer Registry (CPF).
• [ ] Digital file of the document to be signed in text PDF format (not scanned as an image).
• [ ] Smartphone with internet access to install the e-Notariado application.
• [ ] Individual email address of the signatory to receive system notifications.
• [ ] Updated marriage or birth certificate (if the act involves real rights or real estate transfers).
• [ ] Corporate documents and consolidated articles of incorporation (when the signatory represents a legal entity).
• [ ] Public power of attorney instrument with specific powers, if signing through a legal representative.

In practice

Case 1: Vehicle sale with private contract signed on the Gov.br portal and Detran requirements

A citizen negotiated a used vehicle and drafted a private purchase and sale contract electronically signed via the gov.br portal at Silver level. Upon presenting the printed paper sheet in person at the traffic department (Detran), the clerk rejected the document, stating it was impossible to check the authenticity of the stamp printed on paper.

Resolution: The owner forwarded the native digital PDF file to the competent notary public office. The notary public performed cryptographic key validation on the ITI Verifier and issued the corresponding notary certificate of materialization for the digital signature Lei nº 8.935/1994, art. 6º. Armed with the materialized document bearing the public seal of authenticity, the buyer completed the vehicle transfer without gathering new paper signatures.

Case 2: Real estate transfer involving parties in different cities via e-Notariado

Two parties agreed to assign rights over a real estate property. The seller resided in São Paulo and the buyer in Recife. The parties wished to sign the instrument with public authenticity without physically traveling to a notary office.

Resolution: The notary public office issued free e-Notariado digital certificates for both parties through remote biometric validation Provimento CNJ nº 149/2023, Livro II. Subsequently, the notary public presided over the notary videoconferencing session, read the transaction terms, and collected express consent from the declarants. The signature verification and digital signatures by authenticity were executed directly on the platform, and the final file was transmitted with full legal efficacy for real estate registration.

FAQ

Do real estate registry offices accept documents signed via gov.br in person at the counter?

Paper-printed documents containing only the visual representation of a gov.br signature are not accepted at real estate registry counters without prior notary materialization. The electronic signature resides in the native digital file, and its validity depends on the PDF file submitted to the verifier.

How does the registry office identify whether a gov.br signature is Silver or Gold level without the person logging in?

The notary public office or real estate registry uses the ITI Compliance Verifier or the Federal Government validation portal. The system inspects the digital certificate embedded in the PDF file without requiring user login or access credentials.

What is the procedure for authentic signature verification in the digital environment?

The procedure requires issuing a free e-Notariado digital certificate, scheduling a videoconferencing session with the notary public office, and signing the document on the official e-Notariado platform.

What is the difference between signature verification by comparison and an e-Notariado digital certificate?

Verification by comparison matches handwriting on paper against a signature card on file at the notary public office. In contrast, the e-Notariado digital certificate signs electronic documents using asymmetric cryptography combined with in-person or remote biometric validation.

How do you validate the authenticity of a digital signature on a private document?

You validate by uploading the original digital file to official verifiers such as ITI or the e-Notariado system. These systems confirm cryptographic code integrity, signing timestamps, and the validity of the digital certificate used.

Base legal

• provimento_cnj 149 2023 — Provimento CNJ nº 149/2023
• provimento_cnj 149 2023 — Provimento CNJ nº 149/2023
• lei_federal 8.935 1994 — Lei nº 8.935/1994
• codigo 10.406 2002 — Lei nº 10.406/2002 — Código Civil
• lei_federal 14.382 2022 — Lei nº 14.382/2022
• lei_federal 8.935 1994 — Lei nº 8.935/1994

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