Digital Token Issuance Contract

Overview

The Digital Token Issuance Contract is a robust Clarity smart contract that enables the creation and management of collateral-backed digital tokens on the Stacks blockchain. Users can mint digital tokens by locking STX as collateral, with built-in liquidation mechanisms to maintain system solvency.

Key Features

• Collateralized Token Minting: Create digital tokens backed by STX collateral
• Multiple Token Support: Issue and manage various digital token types
• Oracle Price Feeds: Integrate external price data for accurate valuations
• Liquidation Protection: Automatic liquidation of under-collateralized positions
• Emergency Controls: Admin functions to pause/resume the system

Core Concepts

Collateral Ratio

• Minimum Ratio: 150% (users must deposit $1.50 worth of STX for every $1.00 of tokens minted)
• Liquidation Threshold: 120% (positions below this ratio can be liquidated)
• Liquidation Penalty: 10% of collateral goes to the liquidator

System Roles

• Admin: Contract owner who can create tokens, authorize oracles, and manage system state
• Oracle: Authorized addresses that can update token prices
• Users: Anyone can open positions, mint tokens, and participate in liquidations

Main Functions

Administrative Functions

register-digital-token

Creates a new digital token with specified name, symbol, and initial price.

(register-digital-token "Bitcoin Synthetic" "sBTC" u50000)

Parameters:

• name: Token name (max 32 characters)
• symbol: Token symbol (max 10 characters)
• initial-price: Starting price in base units

Returns: Token ID (uint)

authorize-price-feed

Authorizes an oracle address to update token prices.

(authorize-price-feed 'SP2J6ZY48GV1EZ5V2V5RB9MP66SW86PYKKNRV9EJ7)

system-freeze / system-resume

Emergency controls to pause or resume all contract operations.

Oracle Functions

modify-price

Updates the price of a specific token (oracle-only).

(modify-price u1 u51000)

Parameters:

• token-id: ID of the token to update
• new-price: New price value

User Functions

establish-holding

Opens a new collateralized position and mints digital tokens.

(establish-holding u1 u15000 u100)

Parameters:

• token-id: ID of the token to mint
• collateral-amount: Amount of STX to lock as collateral
• synthetic-amount: Amount of digital tokens to mint

Requirements:

• Collateral ratio must be ≥ 150%
• System must not be frozen
• Sufficient STX balance

terminate-holding

Closes an existing position and returns collateral.

(terminate-holding u1)

Returns: All locked STX collateral to the user

deposit-collateral

Adds additional STX collateral to an existing position.

(deposit-collateral u1 u5000)

Use Case: Increase collateral ratio to avoid liquidation

execute-liquidation

Liquidates an under-collateralized position (anyone can call).

(execute-liquidation 'SP2J6ZY48GV1EZ5V2V5RB9MP66SW86PYKKNRV9EJ7 u1)

Parameters:

• user: Address of the position owner
• token-id: ID of the token

Rewards: Liquidator receives 10% of the collateral as a penalty fee

Read-Only Functions

get-token-details

Retrieves information about a specific digital token.

get-account-holding

Returns a user's position details for a given token.

get-user-balance

Gets the digital token balance for a user.

check-liquidation-eligibility

Checks if a position is eligible for liquidation.

get-system-metrics

Returns overall system statistics (total supply, paused status, liquidation penalty).

Error Codes

Code	Constant	Description
u100	ERROR_NOT_AUTHORIZED	Caller lacks required permissions
u101	ERROR_COLLATERAL_TOO_LOW	Insufficient collateral for operation
u102	ERROR_HOLDING_NOT_FOUND	Position does not exist
u103	ERROR_INVALID_VALUE	Invalid amount or parameter
u104	ERROR_LIQUIDATION_LIMIT	Position not eligible for liquidation
u105	ERROR_PRICE_FEED_FAILURE	Oracle price update failed
u106	ERROR_TOKEN_NOT_FOUND	Token ID does not exist
u107	ERROR_INVALID_PARAMETER	Invalid input parameter
u108	ERROR_EMPTY_TEXT	Empty string provided

Usage Example

Creating and Using a Digital Token

1. Admin creates a token:

(contract-call? .digital-token-contract register-digital-token "Gold Synthetic" "sGOLD" u200000)
;; Returns: (ok u1)

2. Admin authorizes an oracle:

(contract-call? .digital-token-contract authorize-price-feed 'SP2ORACLE...)

3. User opens a position:

(contract-call? .digital-token-contract establish-holding u1 u300000 u1000)
;; Locks 300,000 STX to mint 1,000 sGOLD tokens
;; Collateral ratio: (300,000 / (1,000 * 200,000)) * 100 = 150%

4. Oracle updates price:

(contract-call? .digital-token-contract modify-price u1 u250000)
;; Gold price increases to 250,000
;; Collateral ratio drops to 120% (liquidation threshold)

5. Liquidator executes liquidation:

(contract-call? .digital-token-contract execute-liquidation 'SPUSER... u1)
;; Liquidator receives 10% penalty, user gets remaining collateral

Security Considerations

• Price Oracle Risk: System depends on accurate price feeds from authorized oracles
• Collateral Volatility: STX price fluctuations can affect position health
• Front-Running: Liquidations are first-come-first-served and may be front-run
• Admin Control: Contract owner has significant control over system parameters

Testing Recommendations

Before deploying to mainnet:

1. Test all functions with various collateral ratios
2. Simulate liquidation scenarios
3. Verify oracle price update mechanisms
4. Test emergency pause/resume functionality
5. Audit for potential reentrancy or overflow issues