semaphore/docs/versioned_docs/version-V2/technical-reference/contracts.md

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Contracts

When using Semaphore contracts keep in mind that there are two types of contracts:

• Base contracts: they allow you to use the main protocol features (i.e. verify a proof or manage Merkle trees/groups).
• Extension contracts: they contain application logic and could be used for specific use-cases (e.g. anonymous voting).

Our current available extension contracts can be a good example of how base contracts can be used.