Chainlink Integration

At Leet Lotto, we're all about embracing decentralization and ensuring the utmost security for our valued users.

Visit Chainlink

Leet Lotto relies on Chainlink services for tamper-proof randomness and autonomous upkeep.

Verifiable Randomness

// ⚠️ Simplified example
function drawWinner(uint256 lottoId) external onlyUpkeep {
    bytes32 requestId = VRFCoordinator.requestRandomWords(
        keyHash,
        subscriptionId,
        3,          // confirmations
        200000,     // gasLimit
        1           // words
    );
    vrfRequests[requestId] = lottoId;
}

• Chainlink VRF returns a random value used to pick the winning ticket index.

• Anyone can verify the randomness on-chain.

Automation / Upkeep

// ⚠️ Simplified example
function checkUpkeep(bytes calldata) external view returns (bool, bytes memory) {
    bool isReady = block.timestamp >= closingTime && !winnerSelected;
    return (isReady, bytes(""));
}

function performUpkeep(bytes calldata) external {
    require(block.timestamp >= closingTime, "Lottery still open");
    _startVRFRequest();
}

• Draws trigger automatically when a lotto’s closing time hits.

• Removes human intervention and schedule risk.