As part of our "know your customer" identity verification process, we are required to collect the social security or passport numbers of all account owners and admins. Our third-party KYC/KYB provider, Alloy, uses standard databases like LexisNexis to verify identities using the identifying numbers.
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To learn more about what KYC is, please see this Dow Jones article.
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If you subscribe to a service such as LifeLock or another monitoring service for your SSN, you may receive a notification that "Mayfair Finance, Inc." has made a query on your SSN.