Knowledge-based Authentication, commonly referred to as KBA, is a method of authentication that seeks to prove the identity of someone accessing a service.
Proof uses secure third-party data sources to generate Knowledge-based Authentication (KBA) questions as the first part of Multi-Step Verification, an identity-verification method.
- Notarization: The methods available for verifying a signer's identity vary depending on the state in which the notary is commissioned. (The second part of Multi-Step Verification is Credential Analysis.)
- Proof Transaction: The methods used to verify a signer's identity are selected by the person or entity creating and sending the transaction.
KBA questions can be generated for anyone residing in the 50 United States or these three U.S. Territories: Puerto Rico, American Samoa, and U.S. Virgin Islands.
SSN or ITIN
✅ For those who need to verify their identity and/or notarize documents intended for use within the U.S., you may be required to complete Knowledge-based Authentication (KBA). To help you complete KBA, the Proof platform can accept either a U.S. Social Security Number (SSN) or an Individual Tax Identification Number (ITIN).
The identifier used must be tied to sufficient records to generate identity verification questions, such as credit history, vehicle registration, etc.
The identifier used must be tied to sufficient records to generate identity verification questions, such as credit history, vehicle registration, etc.
ℹ️ The last four digits of a U.S. Social Security Number (SSN) are required to generate the security questions to verify identity. We're actively working to build a solution to support foreign citizens who need to have their signatures verified for documents relating to court proceedings, property, or transactions that are either in the U.S. or substantially connected to the U.S. (U.S.-based notaries cannot notarize signatures on documents which have no substantial connection or relationship to U.S. property, court proceedings or transactions).
Articles by Audience
🔗 Anyone can access most of the resources linked below. However, some notary articles require users to sign in to the Help Center. Read Access Notary Help Center Articles to learn more.
- Consumers/Signers: Knowledge-based Authentication for Signers **Includes FAQs!**
- Notaries: Knowledge-Based Authentication (KBA): Identify a Signer
- Enterprise: Full Transaction Flow
- Real Estate:
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