Signature Verification: Resemblance, Authenticity, and Notarial Limits
Understand the procedures, requirements, and liability limits in signature verification by resemblance and by authenticity.
Por Equipe cartorIA — Redação jurídica assistida por IA · 5º Tabelionato de Notas de Recife
This article answers
- What is the difference between signature verification by resemblance and by authenticity?
- Does signature verification certify the validity of the document's content?
- What is the liability of the civil-law notary office in signature verification?
- How does the procedure for signature verification by authenticity work?
- What documents are required to perform signature verification?
In summary
- Signature verification (reconhecimento de firma) is a notarial declaration with public faith certifying the authorship of a signature on a private document.
- Verification by resemblance compares the handwriting style with the signature card archived at the notary office (cartório).
- Verification by authenticity requires the physical presence of the individual and an in-person signature before the notary or notary clerk.
- The act certifies only who signed the paper. It does not analyze the content of the page nor certify the validity of the underlying legal transaction.
What is the difference between signature verification by resemblance and by authenticity?
Signature verification (reconhecimento de firma) has two main modalities in Brazilian notarial law. Each meets specific legal requirements and provides different levels of formal verification.
In signature verification by resemblance (reconhecimento de firma por semelhança), the civil-law notary office (tabelionato de notas) performs handwriting comparison. The notary clerk compares the signature on the private document with the image stored in the signature file (signature card / cartão de autógrafo). The individual does not need to be physically present at the notary office at the time of the act. Anyone can bring the paper to the service counter to obtain notarial validation.
In signature verification by authenticity (reconhecimento de firma por autenticidade), the physical presence of the signatory is mandatory. The citizen appears in person at the notary office carrying an official identification document. They sign the document in the presence of the clerk and sign a ledger of authenticity terms (livro de termo de autenticidade). This type of act is required by express regulation in transactions such as vehicle title transfers (CRV/ATPV-e) or high-value contracts.
| Feature | Verification by Resemblance | Verification by Authenticity |
| :--- | :--- | :--- |
| Physical presence | Optional | Mandatory |
| Verification method | Visual comparison with signature card | Personal identification and in-person signature |
| Ledger signature | Not required | Requires signature in the terms ledger |
| Common use | General contracts and simple powers of attorney | Vehicle transfers and higher-risk transactions |
The notary's authority to certify signatures stems from Lei nº 8.935/1994 (Lei nº 8.935/1994 - Notary and Register Act, art. 6º). The primary objective of the service is to provide publicity, authenticity, and effectiveness to private documents (Lei nº 8.935/1994, art. 1º).
For remote procedures, you can also use digital signature verification via the e-Notariado platform.
Does signature verification certify the validity of the document's content?
Signature verification (reconhecimento de firma) certifies solely the authorship of the signature stated on the page. It does not confer legal validity upon the contract text, nor does it attest to the legality of the obligations described therein.
There is frequent confusion between the act of verifying a signature and drafting a public deed (escritura pública). When executing public deeds, the civil-law notary (tabelião de notas) examines the legal capacity of the parties, the lawfulness of the subject matter, and the compliance of the transaction with the Código Civil (Lei nº 10.406/2002 - Brazilian Civil Code, art. 215). In the act of authenticating a signature, the notary office does not draft or approve the content of the private document.
If a contract contains void or illegal clauses, the notarial act on the signature does not cure these defects. The requirements for the validity of a legal transaction involve a capable agent, a lawful object, and a form prescribed by law (Lei nº 10.406/2002, art. 104).
By affixing the seal and stamp of signature verification, the notary office merely declares: "this signature belongs to the indicated individual." The notary office is not liable for non-compliance with the contract or for contractual fraud devised by the parties.
FAQ
What is the difference between signature verification by resemblance and by authenticity?
In verification by resemblance, the notary office compares the document signature with the stored signature card. In verification by authenticity, the signatory appears in person, signs before the clerk, and signs the terms ledger.
Does signature verification certify the validity of the document's content?
No. Signature verification certifies exclusively the authorship of the signature or the presence of the signatory. It does not validate the content of contractual clauses, the legality of the transaction, or the capacity of the parties.
What is the liability of the civil-law notary office in signature verification?
Notarial liability is restricted to verifying the signature or formally identifying the signatory during the in-person act. The notary is not liable for financial execution or performance of obligations agreed upon in the private instrument.
How does the procedure for signature verification by authenticity work?
The citizen comes to the notary office with an original ID document and the unsigned contract. They sign the paper in the presence of the clerk, fill out the authenticity terms ledger, and receive signature verification.
What documents are required to perform signature verification?
It is necessary to present an official photo ID document and CPF. For the resemblance modality, only the signed document and a signature card previously opened at the notary office are required.
Base legal
- lei_federal 8.935 1994 — Lei nº 8.935/1994
- codigo 10.406 2002 — Lei nº 10.406/2002 — Código Civil
- codigo 10.406 2002 — Lei nº 10.406/2002 — Código Civil
- lei_federal 10.406 2002 — Lei nº 10.406/2002
- lei_federal 8.935 1994 — Lei nº 8.935/1994
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