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RAEKFirstPartyData

Deterministic Matching

Deterministic matching links records to the same person using shared, exact identifiers such as a login, email address, or phone number. Because the match is based on a definite identifier, it is highly accurate and is the preferred method in identity resolution.

When two records share a hashed email or a confirmed account ID, deterministic matching can join them with confidence. This is the backbone of most reliable identity resolution.

Its limit is coverage: it only works where a shared identifier exists. Where it does not, probabilistic matching may fill gaps, at the cost of certainty.

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