> For the complete documentation index, see [llms.txt](https://kuzhanthaivelus-organization.gitbook.io/kyc3-sdk/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://kuzhanthaivelus-organization.gitbook.io/kyc3-sdk/overview/what-we-do.md).

# What we do

The contract facilitates the process of Know Your Customer (KYC) verification on the Ethereum blockchain. Here's what the contract does in more detail:

1. **KYC Data Submission**:
   * Users can submit their KYC data, including their name and user ID, to the contract using the `submitKYC` function.
   * The contract checks that the submitted name and user ID are not empty and that the user ID is unique.
   * If the conditions are met, the KYC data is stored in the contract along with the address of the user who submitted it.
2. **KYC Data Verification**:
   * A designated signer can verify KYC data by calling the `verifyKYC` function with the index of the KYC record to be verified.
   * Only the signer associated with the KYC record can verify it.
   * Verification sets the `verified` flag to true in the KYC record, indicating that the KYC data has been verified.
3. **Retrieval of KYC Data**:
   * Users can retrieve their KYC data by calling the `getKYCDetails` function with the index of their KYC record as a parameter.
   * The function returns the signer's address, name, user ID, and verification status for the specified KYC record.
4. **Retrieval of KYC Data by Signer**:
   * Users can retrieve all KYC data submitted by a specific signer by calling the `getKYCDataBySigner` function with the signer's address as a parameter.
   * The function returns an array of KYC records associated with the specified signer.

In summary, the contract provides a mechanism for users to submit their KYC data, for a designated signer to verify the submitted data, and for users to retrieve their own KYC data or all KYC data associated with a specific signer. This contract aims to assist in identity verification processes within decentralized applications (dApps) or other blockchain-based systems.

<figure><img src="/files/NaRznAasxmU3s5oTUiBo" alt=""><figcaption></figcaption></figure>


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