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Settle Bet88516372019-11-01 8:27:261832 days ago1572596846IN
0x70491AdE...133C2A201
0 ETH0.0005226210
Place Bet88516352019-11-01 8:27:111832 days ago1572596831IN
0x70491AdE...133C2A201
0 ETH0.000579115
Settle Bet88516152019-11-01 8:22:181832 days ago1572596538IN
0x70491AdE...133C2A201
0 ETH0.0005226210
Place Bet88516122019-11-01 8:21:391832 days ago1572596499IN
0x70491AdE...133C2A201
0 ETH0.0011575810
Settle Bet88516032019-11-01 8:19:201832 days ago1572596360IN
0x70491AdE...133C2A201
0 ETH0.0004624310
Place Bet88516002019-11-01 8:19:121832 days ago1572596352IN
0x70491AdE...133C2A201
0 ETH0.0011575810
Settle Bet88515942019-11-01 8:18:051832 days ago1572596285IN
0x70491AdE...133C2A201
0 ETH0.0002745310
Settle Bet88515912019-11-01 8:17:411832 days ago1572596261IN
0x70491AdE...133C2A201
0 ETH0.0002745310
Place Bet88515902019-11-01 8:17:221832 days ago1572596242IN
0x70491AdE...133C2A201
0 ETH0.0011575810
Settle Bet85446722019-09-14 1:14:161880 days ago1568423656IN
0x70491AdE...133C2A201
0 ETH0.0005219810
Place Bet85446682019-09-14 1:13:291880 days ago1568423609IN
0x70491AdE...133C2A201
0 ETH0.0011575810
Settle Bet80839242019-07-04 9:03:151952 days ago1562230995IN
0x70491AdE...133C2A201
0 ETH0.000223186
Place Bet80839222019-07-04 9:02:531952 days ago1562230973IN
0x70491AdE...133C2A201
0 ETH0.000694936
Settle Bet80839152019-07-04 9:01:491952 days ago1562230909IN
0x70491AdE...133C2A201
0 ETH0.000314156
Place Bet80839132019-07-04 9:00:521952 days ago1562230852IN
0x70491AdE...133C2A201
0 ETH0.000695256
Settle Bet80839082019-07-04 8:59:441952 days ago1562230784IN
0x70491AdE...133C2A201
0 ETH0.000313776
Place Bet80839062019-07-04 8:59:011952 days ago1562230741IN
0x70491AdE...133C2A201
0 ETH0.000694876
Settle Bet80839012019-07-04 8:57:261952 days ago1562230646IN
0x70491AdE...133C2A201
0 ETH0.000278046
Place Bet80838992019-07-04 8:57:051952 days ago1562230625IN
0x70491AdE...133C2A201
0 ETH0.000694486
Settle Bet80838892019-07-04 8:55:221952 days ago1562230522IN
0x70491AdE...133C2A201
0 ETH0.000314156
Place Bet80838872019-07-04 8:55:091952 days ago1562230509IN
0x70491AdE...133C2A201
0 ETH0.000694876
Settle Bet80838792019-07-04 8:53:201952 days ago1562230400IN
0x70491AdE...133C2A201
0 ETH0.000314156
Place Bet80838772019-07-04 8:52:391952 days ago1562230359IN
0x70491AdE...133C2A201
0 ETH0.000695256
Settle Bet80838712019-07-04 8:51:451952 days ago1562230305IN
0x70491AdE...133C2A201
0 ETH0.000314156
Place Bet80838682019-07-04 8:51:121952 days ago1562230272IN
0x70491AdE...133C2A201
0 ETH0.000695256
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Contract Source Code Verified (Exact Match)

Contract Name:
GoatClash

Compiler Version
v0.4.24+commit.e67f0147

Optimization Enabled:
No with 200 runs

Other Settings:
default evmVersion

Contract Source Code (Solidity)

/**
 *Submitted for verification at Etherscan.io on 2019-02-15
*/

pragma solidity ^0.4.24;

/**
 * @title ERC20 interface
 * @dev see https://github.com/ethereum/EIPs/issues/20
 */
interface IERC20 {
  function totalSupply() external view returns (uint256);

  function balanceOf(address who) external view returns (uint256);

  function allowance(address owner, address spender)
    external view returns (uint256);

  function transfer(address to, uint256 value) external returns (bool);

  function approve(address spender, uint256 value)
    external returns (bool);

  function transferFrom(address from, address to, uint256 value)
    external returns (bool);

  event Transfer(
    address indexed from,
    address indexed to,
    uint256 value
  );

  event Approval(
    address indexed owner,
    address indexed spender,
    uint256 value
  );
}


/**
 * @title SafeMath
 * @dev Math operations with safety checks that revert on error
 */
library SafeMath {

  /**
  * @dev Multiplies two numbers, reverts on overflow.
  */
  function mul(uint256 a, uint256 b) internal pure returns (uint256) {
    // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
    // benefit is lost if 'b' is also tested.
    // See: https://github.com/OpenZeppelin/openzeppelin-solidity/pull/522
    if (a == 0) {
      return 0;
    }

    uint256 c = a * b;
    require(c / a == b);

    return c;
  }

  /**
  * @dev Integer division of two numbers truncating the quotient, reverts on division by zero.
  */
  function div(uint256 a, uint256 b) internal pure returns (uint256) {
    require(b > 0); // Solidity only automatically asserts when dividing by 0
    uint256 c = a / b;
    // assert(a == b * c + a % b); // There is no case in which this doesn't hold

    return c;
  }

  /**
  * @dev Subtracts two numbers, reverts on overflow (i.e. if subtrahend is greater than minuend).
  */
  function sub(uint256 a, uint256 b) internal pure returns (uint256) {
    require(b <= a);
    uint256 c = a - b;

    return c;
  }

  /**
  * @dev Adds two numbers, reverts on overflow.
  */
  function add(uint256 a, uint256 b) internal pure returns (uint256) {
    uint256 c = a + b;
    require(c >= a);

    return c;
  }

  /**
  * @dev Divides two numbers and returns the remainder (unsigned integer modulo),
  * reverts when dividing by zero.
  */
  function mod(uint256 a, uint256 b) internal pure returns (uint256) {
    require(b != 0);
    return a % b;
  }
}


/**
 * @title Standard ERC20 token
 *
 * @dev Implementation of the basic standard token.
 * https://github.com/ethereum/EIPs/blob/master/EIPS/eip-20.md
 * Originally based on code by FirstBlood: https://github.com/Firstbloodio/token/blob/master/smart_contract/FirstBloodToken.sol
 */
contract ERC20 is IERC20 {
  using SafeMath for uint256;

  mapping (address => uint256) private _balances;

  mapping (address => mapping (address => uint256)) private _allowed;

  uint256 private _totalSupply;

  /**
  * @dev Total number of tokens in existence
  */
  function totalSupply() public view returns (uint256) {
    return _totalSupply;
  }

  /**
  * @dev Gets the balance of the specified address.
  * @param owner The address to query the balance of.
  * @return An uint256 representing the amount owned by the passed address.
  */
  function balanceOf(address owner) public view returns (uint256) {
    return _balances[owner];
  }

  /**
   * @dev Function to check the amount of tokens that an owner allowed to a spender.
   * @param owner address The address which owns the funds.
   * @param spender address The address which will spend the funds.
   * @return A uint256 specifying the amount of tokens still available for the spender.
   */
  function allowance(
    address owner,
    address spender
   )
    public
    view
    returns (uint256)
  {
    return _allowed[owner][spender];
  }

  /**
  * @dev Transfer token for a specified address
  * @param to The address to transfer to.
  * @param value The amount to be transferred.
  */
  function transfer(address to, uint256 value) public returns (bool) {
    _transfer(msg.sender, to, value);
    return true;
  }

  /**
   * @dev Approve the passed address to spend the specified amount of tokens on behalf of msg.sender.
   * 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
   * @param spender The address which will spend the funds.
   * @param value The amount of tokens to be spent.
   */
  function approve(address spender, uint256 value) public returns (bool) {
    require(spender != address(0));

    _allowed[msg.sender][spender] = value;
    emit Approval(msg.sender, spender, value);
    return true;
  }

  /**
   * @dev Transfer tokens from one address to another
   * @param from address The address which you want to send tokens from
   * @param to address The address which you want to transfer to
   * @param value uint256 the amount of tokens to be transferred
   */
  function transferFrom(
    address from,
    address to,
    uint256 value
  )
    public
    returns (bool)
  {
    require(value <= _allowed[from][msg.sender]);

    _allowed[from][msg.sender] = _allowed[from][msg.sender].sub(value);
    _transfer(from, to, value);
    return true;
  }

  /**
   * @dev Increase the amount of tokens that an owner allowed to a spender.
   * approve should be called when allowed_[_spender] == 0. To increment
   * allowed value is better to use this function to avoid 2 calls (and wait until
   * the first transaction is mined)
   * From MonolithDAO Token.sol
   * @param spender The address which will spend the funds.
   * @param addedValue The amount of tokens to increase the allowance by.
   */
  function increaseAllowance(
    address spender,
    uint256 addedValue
  )
    public
    returns (bool)
  {
    require(spender != address(0));

    _allowed[msg.sender][spender] = (
      _allowed[msg.sender][spender].add(addedValue));
    emit Approval(msg.sender, spender, _allowed[msg.sender][spender]);
    return true;
  }

  /**
   * @dev Decrease the amount of tokens that an owner allowed to a spender.
   * approve should be called when allowed_[_spender] == 0. To decrement
   * allowed value is better to use this function to avoid 2 calls (and wait until
   * the first transaction is mined)
   * From MonolithDAO Token.sol
   * @param spender The address which will spend the funds.
   * @param subtractedValue The amount of tokens to decrease the allowance by.
   */
  function decreaseAllowance(
    address spender,
    uint256 subtractedValue
  )
    public
    returns (bool)
  {
    require(spender != address(0));

    _allowed[msg.sender][spender] = (
      _allowed[msg.sender][spender].sub(subtractedValue));
    emit Approval(msg.sender, spender, _allowed[msg.sender][spender]);
    return true;
  }

  /**
  * @dev Transfer token for a specified addresses
  * @param from The address to transfer from.
  * @param to The address to transfer to.
  * @param value The amount to be transferred.
  */
  function _transfer(address from, address to, uint256 value) internal {
    require(value <= _balances[from]);
    require(to != address(0));

    _balances[from] = _balances[from].sub(value);
    _balances[to] = _balances[to].add(value);
    emit Transfer(from, to, value);
  }

  /**
   * @dev Internal function that mints an amount of the token and assigns it to
   * an account. This encapsulates the modification of balances such that the
   * proper events are emitted.
   * @param account The account that will receive the created tokens.
   * @param value The amount that will be created.
   */
  function _mint(address account, uint256 value) internal {
    require(account != 0);
    _totalSupply = _totalSupply.add(value);
    _balances[account] = _balances[account].add(value);
    emit Transfer(address(0), account, value);
  }

  /**
   * @dev Internal function that burns an amount of the token of a given
   * account.
   * @param account The account whose tokens will be burnt.
   * @param value The amount that will be burnt.
   */
  function _burn(address account, uint256 value) internal {
    require(account != 0);
    require(value <= _balances[account]);

    _totalSupply = _totalSupply.sub(value);
    _balances[account] = _balances[account].sub(value);
    emit Transfer(account, address(0), value);
  }

  /**
   * @dev Internal function that burns an amount of the token of a given
   * account, deducting from the sender's allowance for said account. Uses the
   * internal burn function.
   * @param account The account whose tokens will be burnt.
   * @param value The amount that will be burnt.
   */
  function _burnFrom(address account, uint256 value) internal {
    require(value <= _allowed[account][msg.sender]);

    // Should https://github.com/OpenZeppelin/zeppelin-solidity/issues/707 be accepted,
    // this function needs to emit an event with the updated approval.
    _allowed[account][msg.sender] = _allowed[account][msg.sender].sub(
      value);
    _burn(account, value);
  }
}



// GoatClash contract
// Version 1.0
// The Goat Herd @ https://goat.cash
//
// Based on dice2.win Solidity contract. Extended to use ERC20 tokens in place of ETH, 
// betting logic and proofs unchanged. Original comments follow this text.
// Note modified and added lines marked with comments.
//
// * dice2.win - fair games that pay Ether. Version 5.
//
// * Ethereum smart contract, deployed at 0xD1CEeeeee83F8bCF3BEDad437202b6154E9F5405.
//
// * Uses hybrid commit-reveal + block hash random number generation that is immune
//   to tampering by players, house and miners. Apart from being fully transparent,
//   this also allows arbitrarily high bets.
//
// * Refer to https://dice2.win/whitepaper.pdf for detailed description and proofs.
contract GoatClash  {
    // ADDED ERC20 token reference and setter
    ERC20 private _token;
    
    function token() public view returns(ERC20) {
        return _token;
    }

    function setToken(address erc20Token) external onlyOwner {
        _token = ERC20(erc20Token);
    }

    // *** Constants section

    // Each bet is deducted 1% in favour of the house, but no less than some minimum.
    // The lower bound is dictated by gas costs of the settleBet transaction, providing
    // headroom for up to 10 Gwei prices.
    uint constant HOUSE_EDGE_PERCENT = 2;
    uint constant HOUSE_EDGE_MINIMUM_AMOUNT = 1;
    // GOAT MODIFIED: changed min amount, this will cost us gas, boooo..
    //uint constant HOUSE_EDGE_PERCENT = 1;
    //uint constant HOUSE_EDGE_MINIMUM_AMOUNT = 0.0003 ether;

    // Bets lower than this amount do not participate in jackpot rolls (and are
    // not deducted JACKPOT_FEE).
    // GOAT MODIFIED: changed min amount from 0.1 ether
    uint constant MIN_JACKPOT_BET = 5000 * (10 ** 18);

    // Chance to win jackpot (currently 0.1%) and fee deducted into jackpot fund.
    uint constant JACKPOT_MODULO = 1000;
    // GOAT MODIFIED: changed fee amount
    uint constant JACKPOT_FEE = 100 * (10 ** 18);

    // There is minimum and maximum bets.
    // GOAT MODIFIED
    // uint constant MIN_BET = 0.01 ether;
    // uint constant MAX_AMOUNT = 300000 ether;
    uint constant MIN_BET = 1 * (10 ** 18);
    uint constant MAX_AMOUNT = 1000000 * (10 ** 18);

    // Modulo is a number of equiprobable outcomes in a game:
    //  - 2 for coin flip
    //  - 6 for dice
    //  - 6*6 = 36 for double dice
    //  - 100 for etheroll
    //  - 37 for roulette
    //  etc.
    // It's called so because 256-bit entropy is treated like a huge integer and
    // the remainder of its division by modulo is considered bet outcome.
    uint constant MAX_MODULO = 100;

    // For modulos below this threshold rolls are checked against a bit mask,
    // thus allowing betting on any combination of outcomes. For example, given
    // modulo 6 for dice, 101000 mask (base-2, big endian) means betting on
    // 4 and 6; for games with modulos higher than threshold (Etheroll), a simple
    // limit is used, allowing betting on any outcome in [0, N) range.
    //
    // The specific value is dictated by the fact that 256-bit intermediate
    // multiplication result allows implementing population count efficiently
    // for numbers that are up to 42 bits, and 40 is the highest multiple of
    // eight below 42.
    uint constant MAX_MASK_MODULO = 40;

    // This is a check on bet mask overflow.
    uint constant MAX_BET_MASK = 2 ** MAX_MASK_MODULO;

    // EVM BLOCKHASH opcode can query no further than 256 blocks into the
    // past. Given that settleBet uses block hash of placeBet as one of
    // complementary entropy sources, we cannot process bets older than this
    // threshold. On rare occasions dice2.win croupier may fail to invoke
    // settleBet in this timespan due to technical issues or extreme Ethereum
    // congestion; such bets can be refunded via invoking refundBet.
    uint constant BET_EXPIRATION_BLOCKS = 250;

    // Some deliberately invalid address to initialize the secret signer with.
    // Forces maintainers to invoke setSecretSigner before processing any bets.
    address constant DUMMY_ADDRESS = 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE;

    // Standard contract ownership transfer.
    address public owner;
    address private nextOwner;

    // Adjustable max bet profit. Used to cap bets against dynamic odds.
    uint public maxProfit;

    // The address corresponding to a private key used to sign placeBet commits.
    address public secretSigner;

    // Accumulated jackpot fund.
    uint128 public jackpotSize;

    // Funds that are locked in potentially winning bets. Prevents contract from
    // committing to bets it cannot pay out.
    uint128 public lockedInBets;

    // A structure representing a single bet.
    struct Bet {
        // Wager amount in wei.
        uint amount;
        // Modulo of a game.
        uint8 modulo;
        // Number of winning outcomes, used to compute winning payment (* modulo/rollUnder),
        // and used instead of mask for games with modulo > MAX_MASK_MODULO.
        uint8 rollUnder;
        // Block number of placeBet tx.
        uint40 placeBlockNumber;
        // Bit mask representing winning bet outcomes (see MAX_MASK_MODULO comment).
        uint40 mask;
        // Address of a gambler, used to pay out winning bets.
        address gambler;
    }

    // Mapping from commits to all currently active & processed bets.
    mapping (uint => Bet) bets;

    // Croupier account.
    address public croupier;

    // Events that are issued to make statistic recovery easier.
    event FailedPayment(address indexed beneficiary, uint amount);
    event Payment(address indexed beneficiary, uint amount);
    event JackpotPayment(address indexed beneficiary, uint amount);
   
    // This event is emitted in placeBet to record commit in the logs.
    event Commit(uint commit);
    
    // Constructor. Deliberately does not take any parameters.
    constructor () public {
        owner = msg.sender;
        secretSigner = DUMMY_ADDRESS;
        croupier = DUMMY_ADDRESS;
    }

    // Standard modifier on methods invokable only by contract owner.
    modifier onlyOwner {
        require (msg.sender == owner, "OnlyOwner methods called by non-owner.");
        _;
    }

    // Standard modifier on methods invokable only by contract owner.
    modifier onlyCroupier {
        require (msg.sender == croupier, "OnlyCroupier methods called by non-croupier.");
        _;
    }

    // Standard contract ownership transfer implementation,
    function approveNextOwner(address _nextOwner) external onlyOwner {
        require (_nextOwner != owner, "Cannot approve current owner.");
        nextOwner = _nextOwner;
    }

    function acceptNextOwner() external {
        require (msg.sender == nextOwner, "Can only accept preapproved new owner.");
        owner = nextOwner;
    }

    // Fallback function deliberately left empty. It's primary use case
    // is to top up the bank roll.
    function () public payable {
    }

    // See comment for "secretSigner" variable.
    function setSecretSigner(address newSecretSigner) external onlyOwner {
        secretSigner = newSecretSigner;
    }

    // Change the croupier address.
    function setCroupier(address newCroupier) external onlyOwner {
        croupier = newCroupier;
    }

    // Change max bet reward. Setting this to zero effectively disables betting.
    function setMaxProfit(uint _maxProfit) public onlyOwner {
        require (_maxProfit < MAX_AMOUNT, "maxProfit should be a sane number.");
        maxProfit = _maxProfit;
    }

    // MODIFIED
    // This function is used to bump up the jackpot fund. Cannot be used to lower it.
    function increaseJackpot(uint increaseAmount) external onlyOwner {
        require (increaseAmount <= _token.balanceOf(address(this)), "Increase amount larger than balance.");
        require (jackpotSize + lockedInBets + increaseAmount <= _token.balanceOf(address(this)), "Not enough funds.");
        jackpotSize += uint128(increaseAmount);
    }

    // MODIFIED
    // Funds withdrawal to cover costs of dice2.win operation.
    function withdrawFunds(address beneficiary, uint withdrawAmount) external onlyOwner {
        require (withdrawAmount <= _token.balanceOf(address(this)), "Cannot withdraw more than balance.");
        require (jackpotSize + lockedInBets + withdrawAmount <= _token.balanceOf(address(this)), "Not enough funds.");
        sendFunds(beneficiary, withdrawAmount, withdrawAmount);
    }

    // MODIFIED
    // Contract may be destroyed only when there are no ongoing bets,
    // either settled or refunded. All funds are transferred to contract owner.
    function kill() external onlyOwner {
        require (lockedInBets == 0, "All bets should be processed (settled or refunded) before self-destruct.");
        
        // Any remaining funds locked in the Jackpot (which cannot be decreased) will only be withdrawn when contract is killed
        sendFunds(owner, _token.balanceOf(address(this)), _token.balanceOf(address(this)));

        selfdestruct(owner);
    }

    /// *** Betting logic

    // Bet states:
    //  amount == 0 && gambler == 0 - 'clean' (can place a bet)
    //  amount != 0 && gambler != 0 - 'active' (can be settled or refunded)
    //  amount == 0 && gambler != 0 - 'processed' (can clean storage)
    //
    //  NOTE: Storage cleaning is not implemented in this contract version; it will be added
    //        with the next upgrade to prevent polluting Ethereum state with expired bets.

    // Bet placing transaction - issued by the player.
    //  amount          - ADDED: Token bet amount (amount must be already 'approved' by player)
    //  betMask         - bet outcomes bit mask for modulo <= MAX_MASK_MODULO,
    //                    [0, betMask) for larger modulos.
    //  modulo          - game modulo.
    //  commitLastBlock - number of the maximum block where "commit" is still considered valid.
    //  commit          - Keccak256 hash of some secret "reveal" random number, to be supplied
    //                    by the dice2.win croupier bot in the settleBet transaction. Supplying
    //                    "commit" ensures that "reveal" cannot be changed behind the scenes
    //                    after placeBet have been mined.
    //  r, s            - components of ECDSA signature of (commitLastBlock, commit). v is
    //                    guaranteed to always equal 27.
    //
    // Commit, being essentially random 256-bit number, is used as a unique bet identifier in
    // the 'bets' mapping.
    //
    // Commits are signed with a block limit to ensure that they are used at most once - otherwise
    // it would be possible for a miner to place a bet with a known commit/reveal pair and tamper
    // with the blockhash. Croupier guarantees that commitLastBlock will always be not greater than
    // placeBet block number plus BET_EXPIRATION_BLOCKS. See whitepaper for details.
    function placeBet(uint amount, uint betMask, uint modulo, uint commitLastBlock, uint commit, bytes32 r, bytes32 s) external {         
        // Check that the bet is in 'clean' state.
        Bet storage bet = bets[commit];
        require (bet.gambler == address(0), "Bet should be in a 'clean' state.");

        // Validate input data ranges.
        // MODIFIED: Using amount parameter not msg.value;
        //uint amount = msg.value;
        require (amount <= _token.allowance(msg.sender, address(this)), "Bet amount not inserted.");
        require (modulo > 1 && modulo <= MAX_MODULO, "Modulo should be within range.");
        require (amount >= MIN_BET && amount <= MAX_AMOUNT, "Amount should be within range.");
        require (betMask > 0 && betMask < MAX_BET_MASK, "Mask should be within range.");

        // Check that commit is valid - it has not expired and its signature is valid.
        require (block.number <= commitLastBlock, "Commit has expired.");
        bytes32 signatureHash = keccak256(abi.encodePacked(uint40(commitLastBlock), commit));
        require (secretSigner == ecrecover(signatureHash, 27, r, s), "ECDSA signature is not valid.");

        uint rollUnder;
        uint mask;

        if (modulo <= MAX_MASK_MODULO) {
            // Small modulo games specify bet outcomes via bit mask.
            // rollUnder is a number of 1 bits in this mask (population count).
            // This magic looking formula is an efficient way to compute population
            // count on EVM for numbers below 2**40. For detailed proof consult
            // the dice2.win whitepaper.
            rollUnder = ((betMask * POPCNT_MULT) & POPCNT_MASK) % POPCNT_MODULO;
            mask = betMask;
        } else {
            // Larger modulos specify the right edge of half-open interval of
            // winning bet outcomes.
            require (betMask > 0 && betMask <= modulo, "High modulo range, betMask larger than modulo.");
            rollUnder = betMask;
        }

        // Winning amount and jackpot increase.
        uint possibleWinAmount;
        uint jackpotFee;

        (possibleWinAmount, jackpotFee) = getDiceWinAmount(amount, modulo, rollUnder);

        // Enforce max profit limit.
        require (possibleWinAmount <= amount + maxProfit, "maxProfit limit violation.");

        // Lock funds.
        lockedInBets += uint128(possibleWinAmount);
        jackpotSize += uint128(jackpotFee);

        // Check whether contract has enough funds to process this bet.
        // Modified: Updated to ERC20
        require (jackpotSize + lockedInBets <= _token.balanceOf(address(this)), "Cannot afford to lose this bet.");

        // ADDED deduct from approved tokens - moved to settleBet
        //deductFunds(msg.sender, amount);

        // Record commit in logs.
        emit Commit(commit);

        // Store bet parameters on blockchain.
        bet.amount = amount;
        bet.modulo = uint8(modulo);
        bet.rollUnder = uint8(rollUnder);
        bet.placeBlockNumber = uint40(block.number);
        bet.mask = uint40(mask);
        bet.gambler = msg.sender;
    }

    // This is the method used to settle 99% of bets. To process a bet with a specific
    // "commit", settleBet should supply a "reveal" number that would Keccak256-hash to
    // "commit". "blockHash" is the block hash of placeBet block as seen by croupier; it
    // is additionally asserted to prevent changing the bet outcomes on Ethereum reorgs.
    function settleBet(uint reveal, bytes32 blockHash) external onlyCroupier {
        uint commit = uint(keccak256(abi.encodePacked(reveal)));

        Bet storage bet = bets[commit];
        uint placeBlockNumber = bet.placeBlockNumber;

        // Check that bet has not expired yet (see comment to BET_EXPIRATION_BLOCKS).
        require (block.number > placeBlockNumber, "settleBet in the same block as placeBet, or before.");
        require (block.number <= placeBlockNumber + BET_EXPIRATION_BLOCKS, "Blockhash can't be queried by EVM.");
        require (blockhash(placeBlockNumber) == blockHash, "Blockhash does not match.");
        require (bet.amount <= _token.allowance(bet.gambler, address(this)), "Bet amount not inserted."); 

        // Settle bet using reveal and blockHash as entropy sources.
        settleBetCommon(bet, reveal, blockHash);
    }

    // This method is used to settle a bet that was mined into an uncle block. At this
    // point the player was shown some bet outcome, but the blockhash at placeBet height
    // is different because of Ethereum chain reorg. We supply a full merkle proof of the
    // placeBet transaction receipt to provide untamperable evidence that uncle block hash
    // indeed was present on-chain at some point.
    function settleBetUncleMerkleProof(uint reveal, uint40 canonicalBlockNumber) external onlyCroupier {
        // "commit" for bet settlement can only be obtained by hashing a "reveal".
        uint commit = uint(keccak256(abi.encodePacked(reveal)));

        Bet storage bet = bets[commit];

        // Check that canonical block hash can still be verified.
        require (block.number <= canonicalBlockNumber + BET_EXPIRATION_BLOCKS, "Blockhash can't be queried by EVM.");

        // Verify placeBet receipt.
        requireCorrectReceipt(4 + 32 + 32 + 4);

        // Reconstruct canonical & uncle block hashes from a receipt merkle proof, verify them.
        bytes32 canonicalHash;
        bytes32 uncleHash;
        (canonicalHash, uncleHash) = verifyMerkleProof(commit, 4 + 32 + 32);
        require (blockhash(canonicalBlockNumber) == canonicalHash);

        // Settle bet using reveal and uncleHash as entropy sources.
        settleBetCommon(bet, reveal, uncleHash);
    }

    // Common settlement code for settleBet & settleBetUncleMerkleProof.
    function settleBetCommon(Bet storage bet, uint reveal, bytes32 entropyBlockHash) private {
        // Fetch bet parameters into local variables (to save gas).
        uint amount = bet.amount;
        uint modulo = bet.modulo;
        uint rollUnder = bet.rollUnder;
        address gambler = bet.gambler;

        // Check that bet is in 'active' state.
        require (amount != 0, "Bet should be in an 'active' state");

        // Move bet into 'processed' state already.
        bet.amount = 0;

        // The RNG - combine "reveal" and blockhash of placeBet using Keccak256. Miners
        // are not aware of "reveal" and cannot deduce it from "commit" (as Keccak256
        // preimage is intractable), and house is unable to alter the "reveal" after
        // placeBet have been mined (as Keccak256 collision finding is also intractable).
        bytes32 entropy = keccak256(abi.encodePacked(reveal, entropyBlockHash));

        // Do a roll by taking a modulo of entropy. Compute winning amount.
        uint dice = uint(entropy) % modulo;

        uint diceWinAmount;
        uint _jackpotFee;
        (diceWinAmount, _jackpotFee) = getDiceWinAmount(amount, modulo, rollUnder);

        uint diceWin = 0;
        uint jackpotWin = 0;

        // Determine dice outcome.
        if (modulo <= MAX_MASK_MODULO) {
            // For small modulo games, check the outcome against a bit mask.
            if ((2 ** dice) & bet.mask != 0) {
                diceWin = diceWinAmount;
            }

        } else {
            // For larger modulos, check inclusion into half-open interval.
            if (dice < rollUnder) {
                diceWin = diceWinAmount;
            }

        }

        // Unlock the bet amount, regardless of the outcome.
        lockedInBets -= uint128(diceWinAmount);

        // Roll for a jackpot (if eligible).
        if (amount >= MIN_JACKPOT_BET) {
            // The second modulo, statistically independent from the "main" dice roll.
            // Effectively you are playing two games at once!
            uint jackpotRng = (uint(entropy) / modulo) % JACKPOT_MODULO;

            // Bingo!
            if (jackpotRng == 0) {
                jackpotWin = jackpotSize;
                jackpotSize = 0;
            }
        }

        // Log jackpot win.
        if (jackpotWin > 0) {
            emit JackpotPayment(gambler, jackpotWin);
        }

        // ADDED: Perform payment/deduct here to reduce gas costs (I guess this reduces contract interactions and therefore dApp ratings or something) 
        // Lost bet
        if (diceWin + jackpotWin == 0) {
            deductFunds(gambler, amount);
        }
        else {
            // MODIFIED: only send funds on win (less orig amount)
            // Send the funds to gambler.
            sendFunds(gambler, diceWin + jackpotWin == 0 ? 1 wei : diceWin + jackpotWin - amount, diceWin);
        }

        // Send the funds to gambler.
        //sendFunds(gambler, diceWin + jackpotWin == 0 ? 1 wei : diceWin + jackpotWin, diceWin);
    }

    // MODIFIED: Removed as redundant due to settle bet changes - replaced with cancelBet()
    // Refund transaction - return the bet amount of a roll that was not processed in a
    // due timeframe. Processing such blocks is not possible due to EVM limitations (see
    // BET_EXPIRATION_BLOCKS comment above for details). In case you ever find yourself
    // in a situation like this, just contact the dice2.win support, however nothing
    // precludes you from invoking this method yourself.
    // function refundBet(uint commit) external {
    //     // Check that bet is in 'active' state.
    //     Bet storage bet = bets[commit];
    //     uint amount = bet.amount;

    //     require (amount != 0, "Bet should be in an 'active' state");

    //     // Check that bet has already expired.
    //     require (block.number > bet.placeBlockNumber + BET_EXPIRATION_BLOCKS, "Blockhash can't be queried by EVM.");

    //     // Move bet into 'processed' state, release funds.
    //     bet.amount = 0;

    //     uint diceWinAmount;
    //     uint jackpotFee;
    //     (diceWinAmount, jackpotFee) = getDiceWinAmount(amount, bet.modulo, bet.rollUnder);

    //     lockedInBets -= uint128(diceWinAmount);
    //     jackpotSize -= uint128(jackpotFee);

    //     // Send the refund.
    //     sendFunds(bet.gambler, amount, amount);
    // }

    // ADDED
    // A bet which failed to be settled in time (see refund transaction comments) will still 
    // count in locked in values and must be corrected.
    function cancelBet(uint commit) external onlyCroupier {
        // Check that bet is in 'active' state.
        Bet storage bet = bets[commit];
        uint amount = bet.amount;

        require (amount != 0, "Bet should be in an 'active' state");

        // Check that bet has already expired.
        //require (block.number > bet.placeBlockNumber + BET_EXPIRATION_BLOCKS, "Blockhash can't be queried by EVM.");

        // Move bet into 'processed' state, release funds.
        bet.amount = 0;

        uint diceWinAmount;
        uint jackpotFee;
        (diceWinAmount, jackpotFee) = getDiceWinAmount(amount, bet.modulo, bet.rollUnder);

        lockedInBets -= uint128(diceWinAmount);
        jackpotSize -= uint128(jackpotFee);
    }

    // Get the expected win amount after house edge is subtracted.
    function getDiceWinAmount(uint amount, uint modulo, uint rollUnder) private pure returns (uint winAmount, uint jackpotFee) {
        require (0 < rollUnder && rollUnder <= modulo, "Win probability out of range.");

        jackpotFee = amount >= MIN_JACKPOT_BET ? JACKPOT_FEE : 0;

        uint houseEdge = amount * HOUSE_EDGE_PERCENT / 100;

        if (houseEdge < HOUSE_EDGE_MINIMUM_AMOUNT) {
            houseEdge = HOUSE_EDGE_MINIMUM_AMOUNT;
        }

        require (houseEdge + jackpotFee <= amount, "Bet doesn't even cover house edge.");
        winAmount = (amount - houseEdge - jackpotFee) * modulo / rollUnder;
    }

    // Helper routine to process the payment.
    // function sendFunds(address beneficiary, uint amount, uint successLogAmount) internal {
    //     if (beneficiary.send(amount)) {
    //         emit Payment(beneficiary, successLogAmount);
    //     } else {
    //         emit FailedPayment(beneficiary, amount);
    //     }
    // }

    // MODIFIED
    // Override helper routine to process the payment in ERC20    
    function sendFunds(address beneficiary, uint amount, uint successLogAmount) private {
        if (_token.transfer(beneficiary, amount)) {        
            emit Payment(beneficiary, successLogAmount);
        } else {
            emit FailedPayment(beneficiary, amount);
        }
    }

    // ADDED
    // Helper routine to process the payment in ERC20    
    function deductFunds(address player, uint amount) private {
        if (_token.transferFrom(player, address(this), amount)) {
            emit Payment(address(this), amount);
        } else {
            emit FailedPayment(address(this), amount);
        }
    }

    // This are some constants making O(1) population count in placeBet possible.
    // See whitepaper for intuition and proofs behind it.
    uint constant POPCNT_MULT = 0x0000000000002000000000100000000008000000000400000000020000000001;
    uint constant POPCNT_MASK = 0x0001041041041041041041041041041041041041041041041041041041041041;
    uint constant POPCNT_MODULO = 0x3F;

    // *** Merkle proofs.

    // This helpers are used to verify cryptographic proofs of placeBet inclusion into
    // uncle blocks. They are used to prevent bet outcome changing on Ethereum reorgs without
    // compromising the security of the smart contract. Proof data is appended to the input data
    // in a simple prefix length format and does not adhere to the ABI.
    // Invariants checked:
    //  - receipt trie entry contains a (1) successful transaction (2) directed at this smart
    //    contract (3) containing commit as a payload.
    //  - receipt trie entry is a part of a valid merkle proof of a block header
    //  - the block header is a part of uncle list of some block on canonical chain
    // The implementation is optimized for gas cost and relies on the specifics of Ethereum internal data structures.
    // Read the whitepaper for details.

    // Helper to verify a full merkle proof starting from some seedHash (usually commit). "offset" is the location of the proof
    // beginning in the calldata.
    function verifyMerkleProof(uint seedHash, uint offset) pure private returns (bytes32 blockHash, bytes32 uncleHash) {
        // (Safe) assumption - nobody will write into RAM during this method invocation.
        uint scratchBuf1;  assembly { scratchBuf1 := mload(0x40) }

        uint uncleHeaderLength; uint blobLength; uint shift; uint hashSlot;

        // Verify merkle proofs up to uncle block header. Calldata layout is:
        //  - 2 byte big-endian slice length
        //  - 2 byte big-endian offset to the beginning of previous slice hash within the current slice (should be zeroed)
        //  - followed by the current slice verbatim
        for (;; offset += blobLength) {
            assembly { blobLength := and(calldataload(sub(offset, 30)), 0xffff) }
            if (blobLength == 0) {
                // Zero slice length marks the end of uncle proof.
                break;
            }

            assembly { shift := and(calldataload(sub(offset, 28)), 0xffff) }
            require (shift + 32 <= blobLength, "Shift bounds check.");

            offset += 4;
            assembly { hashSlot := calldataload(add(offset, shift)) }
            require (hashSlot == 0, "Non-empty hash slot.");

            assembly {
                calldatacopy(scratchBuf1, offset, blobLength)
                mstore(add(scratchBuf1, shift), seedHash)
                seedHash := sha3(scratchBuf1, blobLength)
                uncleHeaderLength := blobLength
            }
        }

        // At this moment the uncle hash is known.
        uncleHash = bytes32(seedHash);

        // Construct the uncle list of a canonical block.
        uint scratchBuf2 = scratchBuf1 + uncleHeaderLength;
        uint unclesLength; assembly { unclesLength := and(calldataload(sub(offset, 28)), 0xffff) }
        uint unclesShift;  assembly { unclesShift := and(calldataload(sub(offset, 26)), 0xffff) }
        require (unclesShift + uncleHeaderLength <= unclesLength, "Shift bounds check.");

        offset += 6;
        assembly { calldatacopy(scratchBuf2, offset, unclesLength) }
        memcpy(scratchBuf2 + unclesShift, scratchBuf1, uncleHeaderLength);

        assembly { seedHash := sha3(scratchBuf2, unclesLength) }

        offset += unclesLength;

        // Verify the canonical block header using the computed sha3Uncles.
        assembly {
            blobLength := and(calldataload(sub(offset, 30)), 0xffff)
            shift := and(calldataload(sub(offset, 28)), 0xffff)
        }
        require (shift + 32 <= blobLength, "Shift bounds check.");

        offset += 4;
        assembly { hashSlot := calldataload(add(offset, shift)) }
        require (hashSlot == 0, "Non-empty hash slot.");

        assembly {
            calldatacopy(scratchBuf1, offset, blobLength)
            mstore(add(scratchBuf1, shift), seedHash)

            // At this moment the canonical block hash is known.
            blockHash := sha3(scratchBuf1, blobLength)
        }
    }

    // Helper to check the placeBet receipt. "offset" is the location of the proof beginning in the calldata.
    // RLP layout: [triePath, str([status, cumGasUsed, bloomFilter, [[address, [topics], data]])]
    function requireCorrectReceipt(uint offset) view private {
        uint leafHeaderByte; assembly { leafHeaderByte := byte(0, calldataload(offset)) }

        require (leafHeaderByte >= 0xf7, "Receipt leaf longer than 55 bytes.");
        offset += leafHeaderByte - 0xf6;

        uint pathHeaderByte; assembly { pathHeaderByte := byte(0, calldataload(offset)) }

        if (pathHeaderByte <= 0x7f) {
            offset += 1;

        } else {
            require (pathHeaderByte >= 0x80 && pathHeaderByte <= 0xb7, "Path is an RLP string.");
            offset += pathHeaderByte - 0x7f;
        }

        uint receiptStringHeaderByte; assembly { receiptStringHeaderByte := byte(0, calldataload(offset)) }
        require (receiptStringHeaderByte == 0xb9, "Receipt string is always at least 256 bytes long, but less than 64k.");
        offset += 3;

        uint receiptHeaderByte; assembly { receiptHeaderByte := byte(0, calldataload(offset)) }
        require (receiptHeaderByte == 0xf9, "Receipt is always at least 256 bytes long, but less than 64k.");
        offset += 3;

        uint statusByte; assembly { statusByte := byte(0, calldataload(offset)) }
        require (statusByte == 0x1, "Status should be success.");
        offset += 1;

        uint cumGasHeaderByte; assembly { cumGasHeaderByte := byte(0, calldataload(offset)) }
        if (cumGasHeaderByte <= 0x7f) {
            offset += 1;

        } else {
            require (cumGasHeaderByte >= 0x80 && cumGasHeaderByte <= 0xb7, "Cumulative gas is an RLP string.");
            offset += cumGasHeaderByte - 0x7f;
        }

        uint bloomHeaderByte; assembly { bloomHeaderByte := byte(0, calldataload(offset)) }
        require (bloomHeaderByte == 0xb9, "Bloom filter is always 256 bytes long.");
        offset += 256 + 3;

        uint logsListHeaderByte; assembly { logsListHeaderByte := byte(0, calldataload(offset)) }
        require (logsListHeaderByte == 0xf8, "Logs list is less than 256 bytes long.");
        offset += 2;

        uint logEntryHeaderByte; assembly { logEntryHeaderByte := byte(0, calldataload(offset)) }
        require (logEntryHeaderByte == 0xf8, "Log entry is less than 256 bytes long.");
        offset += 2;

        uint addressHeaderByte; assembly { addressHeaderByte := byte(0, calldataload(offset)) }
        require (addressHeaderByte == 0x94, "Address is 20 bytes long.");

        uint logAddress; assembly { logAddress := and(calldataload(sub(offset, 11)), 0xffffffffffffffffffffffffffffffffffffffff) }
        require (logAddress == uint(address(this)));
    }

    // Memory copy.
    function memcpy(uint dest, uint src, uint len) pure private {
        // Full 32 byte words
        for(; len >= 32; len -= 32) {
            assembly { mstore(dest, mload(src)) }
            dest += 32; src += 32;
        }

        // Remaining bytes
        uint mask = 256 ** (32 - len) - 1;
        assembly {
            let srcpart := and(mload(src), not(mask))
            let destpart := and(mload(dest), mask)
            mstore(dest, or(destpart, srcpart))
        }
    }
}

Contract Security Audit

Contract ABI

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Swarm Source

bzzr://c5bb85a448c1aba45506ca12f8112a196e888dc594d45b8f1fe14e25626ea88e

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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.