# Core Components **OP Passport Frontend:** Web interface for users to interact with the platform. **Database:** Storage for user data, badge issuance records, and attestations. **Back-End Service:** * Curia Indexer: Indexed data from on-chain and off-chain. This indexed data will be stored in the database for the criteria for each badge issuance record. * Issuer: The backend service that is responsible for issuing badges to users. It also acts as a relayer for anonymous attestation. **Smart Contracts:** Blockchain-based contracts for badge minting, identity attributes, and ZK proofs. * Resolver: for validate on-chain criteria on endorsement attestation and verify proof & signature on anonymous attestation. * Smart Account: smart contract account as passport and act as identity layer for each user. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.oppassport.xyz/system-framework/core-components.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.