Both. Brazilian KYC/AML laws are based around the CPF number. It also serves corporations as a stable ID to identify people and track them. It's possible that it's a primary key in their databases.

For example, it's common to get cashback in stores in exchange for the CPF number. They track you, comply with regulations and reward you -- all with one government ID.

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alex43578 12 hours ago | parent [-]

Man, seems like those two uses are self-defeating. KYC/AML, but used for things as banal as store rewards. Seems really easy to not know who the actual KYC user is then…

	▲	matheusmoreira an hour ago \| parent [-]
		Correct. There are online CPF generators out there. If you ask someone for a CPF, there's a chance they'll simply make one up.