# Overview

<figure><img src="/files/Vjua2n3PWw9ZFJbJC90U" alt=""><figcaption></figcaption></figure>

ULALO Smart Patient system architecture centers around secure and data-privacy aware system to manage electronic health records (EHR). Here's a summary of how we use Web3 technologies:

* **Identity and Blockchain:**
  * Decentralized Identifiers (DID) is used for secure identity management.
  * The ULALO L1 Chain is used to keep blockchain state and to manage transactions at very low fees.
* **Document Handling and Storage:**
  * Patients can scan documents from their phones and stored them as PDFs.
  * Encrypted PDFs are stored on the InterPlanetary File System (IPFS).
  * The Hash of the PDF is stored on the Blockchain for data integrity.
* **AI Integration:**
  * OCR libraries are used to extract key information from EHR data like for classification and making them easy to retrieve to the patient.
* **Data Security and Privacy:**
  * EHR data is encrypted with the patient's key.
  * Access control lists(ACL) are used to share data with providers that the patient choose to.
  * Patient data is queried using Zero-Knowledge (ZK) proofs to preserve privacy.
  * Hashes and previous hashes are used to maintain data integrity.


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