### SmartTokenX (STX) Standard

**Version:** 1.0.0  
**Purpose:**  
The SmartTokenX standard specifies the requirements for creating secure, fungible tokens that support user registration, authentication, and classical functionalities such as transfers, approvals, and third-party token transfers.

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### 1. Standard Properties

#### 1.1 General Properties
- **Name:** Token name.
- **Symbol:** Token abbreviation (e.g., "STX").
- **Decimals:** Number of decimal places (e.g., `2` for 0.01).
- **TotalSupply:** Total number of tokens in circulation.

#### 1.2 Advanced Features
- **User Registration:** Users can register with an address and private key.
- **User Authentication:** Transactions and operations require authentication via the registered private key.
- **Enhanced Events:** In addition to classic transfer and approval events, the standard includes TransferFrom and logging events.

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### 2. Mandatory Methods

#### 2.1 Token Management
1. **`decimal BalanceOf(string account)`**  
   Returns the balance of a specific account.  
   - **Input:** `account` (account address).  
   - **Output:** Balance as a decimal value.

2. **`decimal Allowance(string owner, string spender)`**  
   Returns the remaining amount a spender is allowed to spend.  
   - **Input:** `owner` (owner's address), `spender` (spender's address).  
   - **Output:** Allowed amount as a decimal value.

#### 2.2 Transactions
1. **`bool Transfer(string from, string to, decimal amount, string privateKey)`**  
   Transfers tokens from one user to another, based on authentication.  
   - **Input:** Sender address, receiver address, amount, private key.  
   - **Output:** `true` if successful.

2. **`bool Approve(string owner, string spender, decimal amount, string privateKey)`**  
   Authorizes a spender to spend the owner's tokens.  
   - **Input:** Owner address, spender address, amount, private key.  
   - **Output:** `true` if successful.

3. **`bool TransferFrom(string spender, string from, string to, decimal amount, string spenderKey)`**  
   Transfers tokens on behalf of an owner, based on prior approval.  
   - **Input:** Spender address, owner address, receiver address, amount, spender's private key.  
   - **Output:** `true` if successful.

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### 3. Advanced Features

#### 3.1 User Registration and Authentication
1. **`bool RegisterUser(string address, string privateKey)`**  
   Registers a user with a unique address and stores the hashed key.  
   - **Input:** Address, private key.  
   - **Output:** `true` if registration is successful.

2. **`bool IsAuthenticated(string address, string privateKey)`**  
   Verifies if a user is authenticated.  
   - **Input:** Address, private key.  
   - **Output:** `true` if authenticated.

#### 3.2 Security Methods
1. **`bool IsValidAddress(string address)`**  
   Checks if an address has a valid format (e.g., must start with "smartX").  
   - **Input:** Address.  
   - **Output:** `true` if valid.

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### 4. Events

1. **`TransferEvent(string from, string to, decimal amount)`**  
   Triggered when tokens are transferred between accounts.

2. **`ApprovalEvent(string owner, string spender, decimal amount)`**  
   Triggered when a spender is authorized to spend an owner’s tokens.

3. **`TransferFromEvent(string spender, string from, string to, decimal amount)`**  
   Triggered when a spender transfers tokens on behalf of an owner.

4. **`Log(string message)`**  
   Used for internal logging and error reporting.

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### 5. Example Implementation

The provided implementation serves as an example for this standard. Developers can use the code and modify methods to meet specific requirements.

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### 6. Advantages of the SmartTokenX Standard
- **Security:** Authentication through private keys and user registration.
- **Extensibility:** Easily adaptable for additional features.
- **Compatibility:** Supports standard methods used in common applications.

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