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FairWin
FairWin
ICO
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FairWin is a gaming platform where the game logic and the amounts of both wagers and wins will be publicly available and the payment of winnings will be automated and won't depend on the organizers.
Category: Platform, Gaming industry, Blockchain
Founded: Apr 7, 2008
Country: United Kingdom
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Information about ICO

Platform Ethereum
Accepted ETH, BTC, ZEC
Start date Mar 11, 2018
End date Apr 14, 2018
Token price 1 FWIN =
Released tokens 11 551 581
Soft cap
Hard cap
Raised
Minimal amount 2 FWIN
Token FWIN - 0.0010000000$
Periods
11.03.2018 14.04.2018
100.00%
FairWin (FWIN)
FairWin (FWIN)
Token
Ethereum
Utility
ERC-20
Platform: Ethereum
trade -
FairWin - token distribution
FairWin - use of funds
Smart contract - FairWin
pragma solidity ^0.4.18;

/**
 * @title SafeMath
 * @dev Math operations with safety checks that throw on error
 */
library SafeMath {
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) {
            return 0;
        }
        uint256 c = a * b;
        assert(c / a == b);
        return c;
    }

    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        // assert(b > 0); // Solidity automatically throws 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;
    }

    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        assert(b <= a);
        return a - b;
    }

    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        assert(c >= a);
        return c;
    }
}

contract Ownable {

    address public owner;

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

    /**
     * @dev The Ownable constructor sets the original `owner` of the contract to the sender
     * account.
     */
    function Ownable() public {
        owner = msg.sender;
    }

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

    /**
     * @dev Allows the current owner to transfer control of the contract to a newOwner.
     * @param newOwner The address to transfer ownership to.
     */
    function transferOwnership(address newOwner) public onlyOwner {
        require(newOwner != address(0));
        OwnershipTransferred(owner, newOwner);
        owner = newOwner;
    }
}

/**
 * @title Finalizable
 * @dev Base contract to finalize some features
 */
contract Finalizable is Ownable {
    event Finish();

    bool public finalized = false;

    function finalize() public onlyOwner {
        finalized = true;
    }

    modifier notFinalized() {
        require(!finalized);
        _;
    }
}

/**
 * @title Part of ERC20 interface
 * @dev see https://github.com/ethereum/EIPs/issues/20
 */
contract IToken {
    function balanceOf(address who) public view returns (uint256);

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

/**
 * @title Token Receivable
 * @dev Support transfer of ERC20 tokens out of this contract's address
 * @dev Even if we don't intend for people to send them here, somebody will
 */
contract TokenReceivable is Ownable {
    event logTokenTransfer(address token, address to, uint256 amount);

    function claimTokens(address _token, address _to) public onlyOwner returns (bool) {
        IToken token = IToken(_token);
        uint256 balance = token.balanceOf(this);
        if (token.transfer(_to, balance)) {
            logTokenTransfer(_token, _to, balance);
            return true;
        }
        return false;
    }
}

contract EventDefinitions {
    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(address indexed owner, address indexed spender, uint256 value);
    event Mint(address indexed to, uint256 amount);
    event Burn(address indexed burner, uint256 value);
}

/**
 * @title Standard ERC20 token
 *
 * @dev Implementation of the basic standard token.
 * @dev https://github.com/ethereum/EIPs/issues/20
 * @dev Based on code by FirstBlood: https://github.com/Firstbloodio/token/blob/master/smart_contract/FirstBloodToken.sol
 */
contract Token is Finalizable, TokenReceivable, EventDefinitions {
    using SafeMath for uint256;

    string public name = "FairWin Token";
    uint8 public decimals = 8;
    string public symbol = "FWIN";

    Controller controller;

    // message of the day
    string public motd;

    function setController(address _controller) public onlyOwner notFinalized {
        controller = Controller(_controller);
    }

    modifier onlyController() {
        require(msg.sender == address(controller));
        _;
    }

    modifier onlyPayloadSize(uint256 numwords) {
        assert(msg.data.length >= numwords * 32 + 4);
        _;
    }

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

    function totalSupply() public view returns (uint256) {
        return controller.totalSupply();
    }

    /**
     * @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
    onlyPayloadSize(2)
    returns (bool success) {
        success = controller.transfer(msg.sender, _to, _value);
        if (success) {
            Transfer(msg.sender, _to, _value);
        }
    }

    /**
     * @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
    onlyPayloadSize(3)
    returns (bool success) {
        success = controller.transferFrom(msg.sender, _from, _to, _value);
        if (success) {
            Transfer(_from, _to, _value);
        }
    }

    /**
     * @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
    onlyPayloadSize(2)
    returns (bool success) {
        //promote safe user behavior
        require(controller.allowance(msg.sender, _spender) == 0);

        success = controller.approve(msg.sender, _spender, _value);
        if (success) {
            Approval(msg.sender, _spender, _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 increaseApproval(address _spender, uint256 _addedValue) public
    onlyPayloadSize(2)
    returns (bool success) {
        success = controller.increaseApproval(msg.sender, _spender, _addedValue);
        if (success) {
            uint256 newValue = controller.allowance(msg.sender, _spender);
            Approval(msg.sender, _spender, newValue);
        }
    }

    /**
     * @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 decreaseApproval(address _spender, uint _subtractedValue) public
    onlyPayloadSize(2)
    returns (bool success) {
        success = controller.decreaseApproval(msg.sender, _spender, _subtractedValue);
        if (success) {
            uint newValue = controller.allowance(msg.sender, _spender);
            Approval(msg.sender, _spender, newValue);
        }
    }

    /**
     * @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 controller.allowance(_owner, _spender);
    }

    /**
     * @dev Burns a specific amount of tokens.
     * @param _amount The amount of token to be burned.
     */
    function burn(uint256 _amount) public
    onlyPayloadSize(1)
    {
        bool success = controller.burn(msg.sender, _amount);
        if (success) {
            Burn(msg.sender, _amount);
        }
    }

    function controllerTransfer(address _from, address _to, uint256 _value) public onlyController {
        Transfer(_from, _to, _value);
    }

    function controllerApprove(address _owner, address _spender, uint256 _value) public onlyController {
        Approval(_owner, _spender, _value);
    }

    function controllerBurn(address _burner, uint256 _value) public onlyController {
        Burn(_burner, _value);
    }

    function controllerMint(address _to, uint256 _value) public onlyController {
        Mint(_to, _value);
    }

    event Motd(string message);

    function setMotd(string _motd) public onlyOwner {
        motd = _motd;
        Motd(_motd);
    }
}

contract Controller is Finalizable {

    Ledger public ledger;
    Token public token;

    function setToken(address _token) public onlyOwner {
        token = Token(_token);
    }

    function setLedger(address _ledger) public onlyOwner {
        ledger = Ledger(_ledger);
    }

    modifier onlyToken() {
        require(msg.sender == address(token));
        _;
    }

    modifier onlyLedger() {
        require(msg.sender == address(ledger));
        _;
    }

    function totalSupply() public onlyToken view returns (uint256) {
        return ledger.totalSupply();
    }

    function balanceOf(address _a) public onlyToken view returns (uint256) {
        return ledger.balanceOf(_a);
    }

    function allowance(address _owner, address _spender) public onlyToken view returns (uint256) {
        return ledger.allowance(_owner, _spender);
    }

    function transfer(address _from, address _to, uint256 _value) public
    onlyToken
    returns (bool) {
        return ledger.transfer(_from, _to, _value);
    }

    function transferFrom(address _spender, address _from, address _to, uint256 _value) public
    onlyToken
    returns (bool) {
        return ledger.transferFrom(_spender, _from, _to, _value);
    }

    function burn(address _owner, uint256 _amount) public
    onlyToken
    returns (bool) {
        return ledger.burn(_owner, _amount);
    }

    function approve(address _owner, address _spender, uint256 _value) public
    onlyToken
    returns (bool) {
        return ledger.approve(_owner, _spender, _value);
    }

    function increaseApproval(address _owner, address _spender, uint256 _addedValue) public
    onlyToken
    returns (bool) {
        return ledger.increaseApproval(_owner, _spender, _addedValue);
    }

    function decreaseApproval(address _owner, address _spender, uint256 _subtractedValue) public
    onlyToken
    returns (bool) {
        return ledger.decreaseApproval(_owner, _spender, _subtractedValue);
    }
}

contract Ledger is Finalizable {
    using SafeMath for uint256;

    address public controller;
    mapping(address => uint256) internal balances;
    mapping(address => mapping(address => uint256)) internal allowed;
    uint256 totalSupply_;
    bool public mintingFinished = false;

    event Mint(address indexed to, uint256 amount);
    event MintFinished();

    function setController(address _controller) public onlyOwner notFinalized {
        controller = _controller;
    }

    modifier onlyController() {
        require(msg.sender == controller);
        _;
    }

    modifier canMint() {
        require(!mintingFinished);
        _;
    }

    function finishMinting() public onlyOwner canMint {
        mintingFinished = true;
        MintFinished();
    }

    /**
     * @dev Gets the balance of the specified address.
     * @param _owner The address to query the 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 total number of tokens in existence
     */
    function totalSupply() public view returns (uint256) {
        return totalSupply_;
    }

    /**
     * @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 _from msg.sender from controller.
     * @param _to The address to transfer to.
     * @param _value The amount to be transferred.
     */
    function transfer(address _from, address _to, uint256 _value) public onlyController returns (bool) {
        require(_to != address(0));
        require(_value <= balances[_from]);

        // SafeMath.sub will throw if there is not enough balance.
        balances[_from] = balances[_from].sub(_value);
        balances[_to] = balances[_to].add(_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 _spender, address _from, address _to, uint256 _value) public onlyController returns (bool) {
        uint256 allow = allowed[_from][_spender];
        require(_to != address(0));
        require(_value <= balances[_from]);
        require(_value <= allow);

        balances[_from] = balances[_from].sub(_value);
        balances[_to] = balances[_to].add(_value);
        allowed[_from][_spender] = allow.sub(_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 _owner, address _spender, uint256 _value) public onlyController returns (bool) {
        //require user to set to zero before resetting to nonzero
        if ((_value != 0) && (allowed[_owner][_spender] != 0)) {
            return false;
        }

        allowed[_owner][_spender] = _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 increaseApproval(address _owner, address _spender, uint256 _addedValue) public onlyController returns (bool) {
        allowed[_owner][_spender] = allowed[_owner][_spender].add(_addedValue);
        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 decreaseApproval(address _owner, address _spender, uint256 _subtractedValue) public onlyController returns (bool) {
        uint256 oldValue = allowed[_owner][_spender];
        if (_subtractedValue > oldValue) {
            allowed[_owner][_spender] = 0;
        } else {
            allowed[_owner][_spender] = oldValue.sub(_subtractedValue);
        }
        return true;
    }

    /**
     * @dev Burns a specific amount of tokens.
     * @param _amount The amount of token to be burned.
     */
    function burn(address _burner, uint256 _amount) public onlyController returns (bool) {
        require(balances[_burner] >= _amount);
        // no need to require _amount <= totalSupply, since that would imply the
        // sender's balance is greater than the totalSupply, which *should* be an assertion failure

        balances[_burner] = balances[_burner].sub(_amount);
        totalSupply_ = totalSupply_.sub(_amount);
        return true;
    }

    /**
     * @dev Function to mint tokens
     * @param _to The address that will receive the minted tokens.
     * @param _amount The amount of tokens to mint.
     * @return A boolean that indicates if the operation was successful.
     */
    function mint(address _to, uint256 _amount) public canMint returns (bool) {
        require(msg.sender == controller || msg.sender == owner);
        totalSupply_ = totalSupply_.add(_amount);
        balances[_to] = balances[_to].add(_amount);
        Mint(_to, _amount);
        return true;
    }
}
Bounty program - FairWin - Ico - FairWin
Platform:
Reward:
Tokens
Start date:
Mar 1, 2018
End date:
Jan 1, 2019
Distribution of tokens : Jan 1, 2019
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