USN

The USN.sol contract is the core of the USN protocol, implementing the USN stablecoin token. This contract inherits from several OpenZeppelin contracts and implements custom functionality specific to the USN protocol.

Overview

USN is an ERC20 token with additional features such as minting, burning, permit functionality, and blacklisting capabilities. It's designed to maintain a stable value pegged to the US Dollar.

Contract Inheritance

USN.sol inherits from the following OpenZeppelin contracts:

• ERC20: Provides standard ERC20 token functionality

• Ownable2Step: Implements a two-step process for transferring contract ownership

• ERC20Burnable: Allows token holders to burn their tokens

• ERC20Permit: Enables gasless token approvals

Key Features

1. Minting

• Only the designated admin can mint new USN tokens

• Minting increases the total supply of USN

2. Burning

• Any token holder can burn their own tokens

• Burning decreases the total supply of USN

3. Permit Functionality

• Allows for gasless approvals using EIP-2612 standard

• Enhances user experience by reducing transaction steps

4. Blacklisting

• The contract owner can blacklist addresses for regulation purposes

• Blacklisted addresses cannot send or receive USN tokens

Security Measures

1. Access Control:

   • Only the owner can blacklist/unblacklist accounts and set the admin

   • Only the admin can mint new tokens

2. Transfer Restrictions:

   • Blacklisted addresses cannot send or receive tokens

3. Two-Step Ownership Transfer:

   • Inherits Ownable2Step to prevent accidental transfer of ownership