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Contract

0x5A2b9057dDD363F58171a3a893e6A1717c51F005

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Transaction Hash
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Bet With Token58990812025-04-04 17:00:497 days ago1743786049IN
0x5A2b9057...17c51F005
0 ETH0.000008270.04525
Bet With Token58952542025-04-04 15:55:387 days ago1743782138IN
0x5A2b9057...17c51F005
0 ETH0.000008070.04525
Bet With Token57045722025-04-02 9:40:299 days ago1743586829IN
0x5A2b9057...17c51F005
0 ETH0.00000740.04525
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0x5A2b9057...17c51F005
0 ETH0.000006310.04525
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0x5A2b9057...17c51F005
0 ETH0.000008280.04525
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0x5A2b9057...17c51F005
0 ETH0.000006410.04525
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0x5A2b9057...17c51F005
0 ETH0.000006410.04525
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0x5A2b9057...17c51F005
0 ETH0.00000640.04525
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0x5A2b9057...17c51F005
0 ETH0.000007840.04525
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0x5A2b9057...17c51F005
0 ETH0.000006570.04525
Bet With Token56561302025-04-01 19:36:0510 days ago1743536165IN
0x5A2b9057...17c51F005
0 ETH0.000006560.04525
Bet With Token56560772025-04-01 19:35:1110 days ago1743536111IN
0x5A2b9057...17c51F005
0 ETH0.000006560.04525
Bet With Token56560392025-04-01 19:34:3310 days ago1743536073IN
0x5A2b9057...17c51F005
0 ETH0.000006550.04525
Bet With Token56559952025-04-01 19:33:4810 days ago1743536028IN
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0 ETH0.000006550.04525
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0 ETH0.000006550.04525
Bet With Token56556952025-04-01 19:28:4210 days ago1743535722IN
0x5A2b9057...17c51F005
0 ETH0.000006540.04525
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0 ETH0.000006540.04525
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Bet With Token56550572025-04-01 19:17:3910 days ago1743535059IN
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0 ETH0.000007040.04525
Bet With Token56546952025-04-01 19:11:2610 days ago1743534686IN
0x5A2b9057...17c51F005
0 ETH0.000006950.04525
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Parent Transaction Hash Block From To
55737882025-03-31 19:57:3111 days ago1743451051  Contract Creation0 ETH
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Contract Source Code Verified (Exact Match)

Contract Name:
CoinFlip

Compiler Version
v0.8.24+commit.e11b9ed9

ZkSolc Version
v1.5.11

Optimization Enabled:
Yes with Mode 3

Other Settings:
paris EvmVersion
File 1 of 7 : CoinFlip.sol
/*
  _  _              _        _   ___ _             _                
 | || |___  ___  __| |___ __| | | _ \ |_  __ _ _ _| |_ ___ _ __  ___
 | __ / _ \/ _ \/ _` / -_) _` | |  _/ ' \/ _` | ' \  _/ _ \ '  \(_-<
 |_||_\___/\___/\__,_\___\__,_| |_| |_||_\__,_|_||_\__\___/_|_|_/__/
                                                                                              
*/

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.18;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/ReentrancyGuard.sol";
import "./gelato/GelatoVRFConsumerBase.sol";


/**
 * @title CoinFlip
 * @dev A coin flip game contract that allows users to bet with ETH or ERC20 tokens.
 * Users have a 45% chance of winning (2x payout) and 55% chance of losing.
 * When users lose, 10% goes to a fee recipient and 90% stays in the contract.
 * Random numbers are provided by Gelato's VRF system.
 */
contract CoinFlip is Ownable, ReentrancyGuard, GelatoVRFConsumerBase {

   

    //Gelato VRF
    address private immutable _operatorAddr;

    // Constants
    address public constant FEE_RECIPIENT = 0x4a1F4EE64066ADC42eEFB174907E5714F9E995b3;
    uint256 public constant WIN_PERCENTAGE = 45; // 45% chance to win
    uint256 public constant FEE_PERCENTAGE = 10; // 10% fee on losses

    // Enums and structs
    enum Choice { HEADS, TAILS }
    enum BetType { ETH, TOKEN }
    
    struct Bet {
        address player;
        uint256 amount;
        Choice choice;
        BetType betType;
        address tokenAddress;
        bool isSettled;
        bool isWon;
    }
    
    // State variables
    mapping(uint256 => Bet) public bets;
    mapping(address => bool) public supportedTokens;
    
    // Hidden wisdom for gamblers
    string private constant GAMBLING_WISDOM = "If you keep flipping coins, eventually Lady Luck will flip you!";
    
    // Events
    event BetPlaced(uint256 indexed requestId, address indexed player, uint256 amount, Choice choice, BetType betType, address tokenAddress);
    event BetSettled(uint256 indexed requestId, address indexed player, uint256 amount, Choice choice, bool isWon, uint256 payout);
    event TokenAdded(address indexed tokenAddress);
    event TokenRemoved(address indexed tokenAddress);
    
    /**
     * @dev Constructor to initialize the CoinFlip contract
     * @param operator Address of the operator
     */
    constructor(address operator) Ownable(msg.sender) {
        require(operator != address(0), "operator address cannot be zero");
        _operatorAddr = operator;
    }

    /**
     * @dev get operator address
     * @return operator ID of the VRF request
     */
    function _operator() internal view override returns (address) {
        return _operatorAddr;
    }

    /**
     * @dev Place a bet with ETH
     * @param _choice The user's choice (HEADS or TAILS)
     * @return requestId The ID of the VRF request
     */
    function betWithEth(Choice _choice) external payable nonReentrant returns (uint256) {
        require(msg.value > 0, "Bet amount must be greater than 0");
        
        uint256 requestId = _requestRandomness(abi.encode(msg.sender));

        bets[requestId] = Bet({
            player: msg.sender,
            amount: msg.value,
            choice: _choice,
            betType: BetType.ETH,
            tokenAddress: address(0),
            isSettled: false,
            isWon: false
        });
        
        emit BetPlaced(requestId, msg.sender, msg.value, _choice, BetType.ETH, address(0));
        
        return requestId;
    }
    
    /**
     * @dev Place a bet with an ERC20 token
     * @param _tokenAddress The address of the ERC20 token
     * @param _amount The amount of tokens to bet
     * @param _choice The user's choice (HEADS or TAILS)
     * @return requestId The ID of the VRF request
     */
    function betWithToken(address _tokenAddress, uint256 _amount, Choice _choice) external nonReentrant returns (uint256) {
        require(_amount > 0, "Bet amount must be greater than 0");
        require(supportedTokens[_tokenAddress], "Token not supported");
        
        IERC20 token = IERC20(_tokenAddress);
        require(token.transferFrom(msg.sender, address(this), _amount), "Token transfer failed");
        
        //uint256 requestId = IVRFSystem(VRF_ADDRESS).requestRandomNumberWithTraceId(0);
        uint256 requestId = _requestRandomness(abi.encode(msg.sender));

        bets[requestId] = Bet({
            player: msg.sender,
            amount: _amount,
            choice: _choice,
            betType: BetType.TOKEN,
            tokenAddress: _tokenAddress,
            isSettled: false,
            isWon: false
        });
        
        emit BetPlaced(requestId, msg.sender, _amount, _choice, BetType.TOKEN, _tokenAddress);
        
        return requestId;
    }
    
    /**
     * @dev Callback function called by the VRF contract with the random number
     * @param randomness The random number provided by the VRF
     * @param requestId The ID of the VRF request
     * @param data The ID of the VRF request
     */
    function _fulfillRandomness(
        uint256 randomness,
        uint256 requestId,
        bytes memory data  
    ) internal override {
        require(!bets[requestId].isSettled, "Bet already settled");
        
        Bet storage bet = bets[requestId];
        require(bet.player != address(0), "Bet does not exist");
        
        // Use the random number to determine the result with 45% win chance
        // To avoid modulo bias, we use a large number (let's say 1000) and compare with WIN_PERCENTAGE * 10
        bool isHeads = (randomness % 1000) < (WIN_PERCENTAGE * 10);
        bool playerWon = (bet.choice == Choice.HEADS && isHeads) || (bet.choice == Choice.TAILS && !isHeads);
        
        bet.isSettled = true;
        bet.isWon = playerWon;
        
        uint256 payout = 0;
        
        if (playerWon) {
            // Player wins 2x their bet
            payout = bet.amount * 2;
            
            if (bet.betType == BetType.ETH) {
                (bool success, ) = bet.player.call{value: payout}("");
                require(success, "ETH transfer failed");
            } else {
                IERC20 token = IERC20(bet.tokenAddress);
                require(token.transfer(bet.player, payout), "Token transfer failed");
            }
        } else {
            // Player loses, distribute fees (10% to fee recipient, 90% stays in contract)
            uint256 feeAmount = (bet.amount * FEE_PERCENTAGE) / 100;
            
            if (bet.betType == BetType.ETH) {
                (bool success, ) = FEE_RECIPIENT.call{value: feeAmount}("");
                require(success, "Fee transfer failed");
            } else {
                IERC20 token = IERC20(bet.tokenAddress);
                require(token.transfer(FEE_RECIPIENT, feeAmount), "Fee transfer failed");
            }
            // The rest (90%) stays in the contract for future payouts
        }
        
        emit BetSettled(requestId, bet.player, bet.amount, bet.choice, playerWon, payout);
    }

    
    /**
     * @dev Add a token to the list of supported tokens
     * @param _tokenAddress The address of the token to add
     */
    function addSupportedToken(address _tokenAddress) external onlyOwner {
        require(_tokenAddress != address(0), "Token address cannot be zero");
        supportedTokens[_tokenAddress] = true;
        emit TokenAdded(_tokenAddress);
    }
    
    /**
     * @dev Remove a token from the list of supported tokens
     * @param _tokenAddress The address of the token to remove
     */
    function removeSupportedToken(address _tokenAddress) external onlyOwner {
        supportedTokens[_tokenAddress] = false;
        emit TokenRemoved(_tokenAddress);
    }
    
    /**
     * @dev Withdraw ETH from the contract
     * @param _amount The amount of ETH to withdraw
     */
    function withdraw(uint256 _amount) external onlyOwner {
        require(_amount <= address(this).balance, "Insufficient balance");
        (bool success, ) = owner().call{value: _amount}("");
        require(success, "Withdrawal failed");
    }
    
    /**
     * @dev Withdraw tokens from the contract
     * @param _tokenAddress The address of the token to withdraw
     * @param _amount The amount of tokens to withdraw
     */
    function withdrawToken(address _tokenAddress, uint256 _amount) external onlyOwner {
        IERC20 token = IERC20(_tokenAddress);
        require(token.transfer(owner(), _amount), "Token transfer failed");
    }
    
    /**
     * @dev Get information about a bet
     * @param _requestId The ID of the bet
     * @return player The address of the player
     * @return amount The amount of the bet
     * @return choice The player's choice
     * @return betType The type of bet (ETH or TOKEN)
     * @return tokenAddress The address of the token (if applicable)
     * @return isSettled Whether the bet has been settled
     * @return isWon Whether the bet was won
     */
    function getBetInfo(uint256 _requestId) external view returns (
        address player,
        uint256 amount,
        Choice choice,
        BetType betType,
        address tokenAddress,
        bool isSettled,
        bool isWon
    ) {
        Bet storage bet = bets[_requestId];
        return (
            bet.player,
            bet.amount,
            bet.choice,
            bet.betType,
            bet.tokenAddress,
            bet.isSettled,
            bet.isWon
        );
    }
    
    /**
     * @dev Get the ETH balance of the contract
     * @return The ETH balance of the contract
     */
    function getContractBalance() external view returns (uint256) {
        return address(this).balance;
    }
    
    /**
     * @dev Get the token balance of the contract
     * @param _tokenAddress The address of the token
     * @return The token balance of the contract
     */
    function getTokenBalance(address _tokenAddress) external view returns (uint256) {
        return IERC20(_tokenAddress).balanceOf(address(this));
    }
    
    /**
     * @dev Check if a token is supported by the contract
     * @param _tokenAddress The address of the token
     * @return Whether the token is supported
     */
    function isTokenSupported(address _tokenAddress) external view returns (bool) {
        return supportedTokens[_tokenAddress];
    }
    
    // Fallback and receive functions to accept ETH
    receive() external payable {}
    fallback() external payable {}
}

File 2 of 7 : GelatoVRFConsumerBase.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import {IGelatoVRFConsumer} from "./IGelatoVRFConsumer.sol";

/// @title GelatoVRFConsumerBase
/// @dev This contract can be inherit by upgradeable smart contracts as well.
/// @dev This contract handles domain separation between consecutive randomness requests
/// The contract has to be implemented by contracts willing to use the gelato VRF system.
/// This base contract enhances the GelatoVRFConsumer by introducing request IDs and
/// ensuring unique random values.
/// for different request IDs by hashing them with the random number provided by drand.
/// For security considerations, refer to the Gelato documentation.
abstract contract GelatoVRFConsumerBase is IGelatoVRFConsumer {
    uint256 private constant _PERIOD = 3;
    uint256 private constant _GENESIS = 1692803367;
    bool[] public requestPending;
    mapping(uint256 => bytes32) public requestedHash;

    /// @notice Returns the address of the dedicated msg.sender.
    /// @dev The operator can be found on the Gelato dashboard after a VRF is deployed.
    /// @return Address of the operator.
    function _operator() internal view virtual returns (address);

    /// @notice User logic to handle the random value received.
    /// @param randomness The random number generated by Gelato VRF.
    /// @param requestId The ID for the randomness request.
    /// @param extraData Additional data from the randomness request.
    function _fulfillRandomness(
        uint256 randomness,
        uint256 requestId,
        bytes memory extraData
    ) internal virtual;

    /// @notice Requests randomness from the Gelato VRF.
    /// @dev The extraData parameter allows for additional data to be passed to
    /// the VRF, which is then forwarded to the callback. This is useful for
    /// request tracking purposes if requestId is not enough.
    /// @param extraData Additional data for the randomness request.
    /// @return requestId The ID for the randomness request.
    function _requestRandomness(
        bytes memory extraData
    ) internal returns (uint256 requestId) {
        requestId = uint256(requestPending.length);
        requestPending.push();
        requestPending[requestId] = true;

        bytes memory data = abi.encode(requestId, extraData);
        uint256 round = _round();

        bytes memory dataWithRound = abi.encode(round, data);
        bytes32 requestHash = keccak256(dataWithRound);

        requestedHash[requestId] = requestHash;

        emit RequestedRandomness(round, data);
    }

    /// @notice Callback function used by Gelato VRF to return the random number.
    /// The randomness is derived by hashing the provided randomness with the request ID.
    /// @param randomness The random number generated by Gelato VRF.
    /// @param dataWithRound Additional data provided by Gelato VRF containing request details.
    function fulfillRandomness(
        uint256 randomness,
        bytes calldata dataWithRound
    ) external {
        require(msg.sender == _operator(), "only operator");

        (, bytes memory data) = abi.decode(dataWithRound, (uint256, bytes));
        (uint256 requestId, bytes memory extraData) = abi.decode(
            data,
            (uint256, bytes)
        );

        bytes32 requestHash = keccak256(dataWithRound);
        bool isValidRequestHash = requestHash == requestedHash[requestId];

        require(requestPending[requestId], "request fulfilled or missing");

        if (isValidRequestHash) {
            randomness = uint(
                keccak256(
                    abi.encode(
                        randomness,
                        address(this),
                        block.chainid,
                        requestId
                    )
                )
            );

            _fulfillRandomness(randomness, requestId, extraData);
            requestPending[requestId] = false;

            delete requestedHash[requestId];
        }
    }

    /// @notice Computes and returns the round number of drand to request randomness from.
    function _round() private view returns (uint256 round) {
        // solhint-disable-next-line not-rely-on-time
        uint256 elapsedFromGenesis = block.timestamp - _GENESIS;
        uint256 currentRound = (elapsedFromGenesis / _PERIOD) + 1;

        round = block.chainid == 1 ? currentRound + 4 : currentRound + 1;
    }
}

File 3 of 7 : IERC20.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.20;

/**
 * @dev Interface of the ERC-20 standard as defined in the ERC.
 */
interface IERC20 {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);

    /**
     * @dev Returns the value of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the value of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves a `value` amount of tokens from the caller's account to `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, uint256 value) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets a `value` amount of tokens as the allowance of `spender` over the
     * caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 value) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from `from` to `to` using the
     * allowance mechanism. `value` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address from, address to, uint256 value) external returns (bool);
}

File 4 of 7 : ReentrancyGuard.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (utils/ReentrancyGuard.sol)

pragma solidity ^0.8.20;

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If EIP-1153 (transient storage) is available on the chain you're deploying at,
 * consider using {ReentrancyGuardTransient} instead.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant NOT_ENTERED = 1;
    uint256 private constant ENTERED = 2;

    uint256 private _status;

    /**
     * @dev Unauthorized reentrant call.
     */
    error ReentrancyGuardReentrantCall();

    constructor() {
        _status = NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and making it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        _nonReentrantBefore();
        _;
        _nonReentrantAfter();
    }

    function _nonReentrantBefore() private {
        // On the first call to nonReentrant, _status will be NOT_ENTERED
        if (_status == ENTERED) {
            revert ReentrancyGuardReentrantCall();
        }

        // Any calls to nonReentrant after this point will fail
        _status = ENTERED;
    }

    function _nonReentrantAfter() private {
        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = NOT_ENTERED;
    }

    /**
     * @dev Returns true if the reentrancy guard is currently set to "entered", which indicates there is a
     * `nonReentrant` function in the call stack.
     */
    function _reentrancyGuardEntered() internal view returns (bool) {
        return _status == ENTERED;
    }
}

File 5 of 7 : Ownable.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (access/Ownable.sol)

pragma solidity ^0.8.20;

import {Context} from "../utils/Context.sol";

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * The initial owner is set to the address provided by the deployer. This can
 * later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

    /**
     * @dev The caller account is not authorized to perform an operation.
     */
    error OwnableUnauthorizedAccount(address account);

    /**
     * @dev The owner is not a valid owner account. (eg. `address(0)`)
     */
    error OwnableInvalidOwner(address owner);

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the address provided by the deployer as the initial owner.
     */
    constructor(address initialOwner) {
        if (initialOwner == address(0)) {
            revert OwnableInvalidOwner(address(0));
        }
        _transferOwnership(initialOwner);
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        if (owner() != _msgSender()) {
            revert OwnableUnauthorizedAccount(_msgSender());
        }
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby disabling any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        if (newOwner == address(0)) {
            revert OwnableInvalidOwner(address(0));
        }
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

File 6 of 7 : IGelatoVRFConsumer.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

/// @title IGelatoVRFConsumer
/// @dev Interface for consuming random number provided by Drand.
/// @notice This interface allows contracts to receive a random number provided by Gelato VRF.
interface IGelatoVRFConsumer {
    /// @notice Event emitted when a randomness request is made.
    /// @param data The round of randomness to request.
    /// @param data Additional data associated with the request.
    event RequestedRandomness(uint256 round, bytes data);

    /// @notice Callback function used by Gelato to return the random number.
    /// @dev The random number is fetched from one among many drand endpoints
    /// and passed back to this function like in a Gelato Web3 Function.
    /// @param randomness The random number generated by drand.
    /// @param data Additional data provided by Gelato VRF or the user, typically unused.
    function fulfillRandomness(
        uint256 randomness,
        bytes calldata data
    ) external;
}

File 7 of 7 : Context.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.1) (utils/Context.sol)

pragma solidity ^0.8.20;

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }

    function _contextSuffixLength() internal view virtual returns (uint256) {
        return 0;
    }
}

Settings
{
  "evmVersion": "paris",
  "optimizer": {
    "enabled": true,
    "mode": "3"
  },
  "outputSelection": {
    "*": {
      "*": [
        "abi"
      ]
    }
  },
  "detectMissingLibraries": false,
  "forceEVMLA": false,
  "enableEraVMExtensions": false,
  "libraries": {}
}

Contract Security Audit

Contract ABI

API
[{"inputs":[{"internalType":"address","name":"operator","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[{"internalType":"address","name":"owner","type":"address"}],"name":"OwnableInvalidOwner","type":"error"},{"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"OwnableUnauthorizedAccount","type":"error"},{"inputs":[],"name":"ReentrancyGuardReentrantCall","type":"error"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint256","name":"requestId","type":"uint256"},{"indexed":true,"internalType":"address","name":"player","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"},{"indexed":false,"internalType":"enum CoinFlip.Choice","name":"choice","type":"uint8"},{"indexed":false,"internalType":"enum CoinFlip.BetType","name":"betType","type":"uint8"},{"indexed":false,"internalType":"address","name":"tokenAddress","type":"address"}],"name":"BetPlaced","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint256","name":"requestId","type":"uint256"},{"indexed":true,"internalType":"address","name":"player","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"},{"indexed":false,"internalType":"enum CoinFlip.Choice","name":"choice","type":"uint8"},{"indexed":false,"internalType":"bool","name":"isWon","type":"bool"},{"indexed":false,"internalType":"uint256","name":"payout","type":"uint256"}],"name":"BetSettled","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"round","type":"uint256"},{"indexed":false,"internalType":"bytes","name":"data","type":"bytes"}],"name":"RequestedRandomness","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"tokenAddress","type":"address"}],"name":"TokenAdded","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"tokenAddress","type":"address"}],"name":"TokenRemoved","type":"event"},{"stateMutability":"payable","type":"fallback"},{"inputs":[],"name":"FEE_PERCENTAGE","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"FEE_RECIPIENT","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"WIN_PERCENTAGE","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_tokenAddress","type":"address"}],"name":"addSupportedToken","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"enum CoinFlip.Choice","name":"_choice","type":"uint8"}],"name":"betWithEth","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"_tokenAddress","type":"address"},{"internalType":"uint256","name":"_amount","type":"uint256"},{"internalType":"enum CoinFlip.Choice","name":"_choice","type":"uint8"}],"name":"betWithToken","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"bets","outputs":[{"internalType":"address","name":"player","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"enum CoinFlip.Choice","name":"choice","type":"uint8"},{"internalType":"enum CoinFlip.BetType","name":"betType","type":"uint8"},{"internalType":"address","name":"tokenAddress","type":"address"},{"internalType":"bool","name":"isSettled","type":"bool"},{"internalType":"bool","name":"isWon","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"randomness","type":"uint256"},{"internalType":"bytes","name":"dataWithRound","type":"bytes"}],"name":"fulfillRandomness","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_requestId","type":"uint256"}],"name":"getBetInfo","outputs":[{"internalType":"address","name":"player","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"enum CoinFlip.Choice","name":"choice","type":"uint8"},{"internalType":"enum CoinFlip.BetType","name":"betType","type":"uint8"},{"internalType":"address","name":"tokenAddress","type":"address"},{"internalType":"bool","name":"isSettled","type":"bool"},{"internalType":"bool","name":"isWon","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getContractBalance","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_tokenAddress","type":"address"}],"name":"getTokenBalance","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_tokenAddress","type":"address"}],"name":"isTokenSupported","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_tokenAddress","type":"address"}],"name":"removeSupportedToken","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"requestPending","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"requestedHash","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"supportedTokens","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_amount","type":"uint256"}],"name":"withdraw","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_tokenAddress","type":"address"},{"internalType":"uint256","name":"_amount","type":"uint256"}],"name":"withdrawToken","outputs":[],"stateMutability":"nonpayable","type":"function"},{"stateMutability":"payable","type":"receive"}]

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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)

0000000000000000000000004207f914b195238712abab084c2979ce80f93a29

-----Decoded View---------------
Arg [0] : operator (address): 0x4207F914B195238712abaB084C2979cE80f93a29

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 0000000000000000000000004207f914b195238712abab084c2979ce80f93a29


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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.