# System Overview

## The structure of the DEXPIRY system

The DEXPIRY system consists of 3 interconnected components:

* [<mark style="color:green;">User Application (DEXPIRY dApp)</mark>](/dexpiry_public_eng/system-components/user-application.md)
* [<mark style="color:green;">Distributed Data Base (DEXPIRY DB)</mark>](/dexpiry_public_eng/system-components/data-base.md)
* [<mark style="color:green;">Blockchain Records (DEXPIRY public records)</mark>](/dexpiry_public_eng/system-components/blockchain-records.md)

## Authorization levels for DEXPIRY dApp

Each user of the DEXPIRY application is assigned one of the authorization levels:

* [<mark style="color:green;">Basic User</mark>](/dexpiry_public_eng/authorization-levels.md#basic_user)
* [<mark style="color:green;">Token Issuer</mark>](/dexpiry_public_eng/authorization-levels.md#authorization-level-token-issuer-for-warranty-issuers)
* [<mark style="color:green;">Regulator</mark>](/dexpiry_public_eng/authorization-levels.md#autorizacijska-razina-regulator)
* [<mark style="color:green;">Administrator</mark>](/dexpiry_public_eng/authorization-levels.md#autorizacijska-razina-administrator)

## Functions of the DEXPIRY system

* Creation and allocation of DEXPIRY warranty tokens (mint token)
* Claiming of assigned guarantee tokens (claim token)
* Digital authentication / confirmation of token ownership (cryptographic signature)
* Sending and receiving warranty tokens (send/receive token)
* Tracking warranty tokens on the blockchain (track token)
  * a) Tracking of the **assigned** warranty tokens&#x20;
  * b) Tracking of the **created** warranty tokens&#x20;
  * c) Tracking of **all** warranty tokens
* Verification and confirmation of warranty token transactions (TX validator)
* Access to details about the product and its warranty (token details)
  * a) for purchased products
  * b) for sold products
* Access to a personal user box in a decentralized database

Admin functions:

* Assigning and changing user authorization levels (delegate role)
* Deleting warranty tokens (burn token)
* Editing of a decentralized database


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