# Via Smart Contract

To query passport attributes, your DApp reads the [QuadReader](https://docs.quadrata.com/integration/additional-information/smart-contracts) smart contract to check the value of certain *attributes*. A passport attribute represents data about the user, such as anti-money laundering (AML) risk score, country of government ID, or any other data stored on their passport. You can find attributes supported by Quadrata Passport [here](https://docs.quadrata.com/integration/introduction/passport-attributes).

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