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Contract

0xF0E3eD8c38Ba9CCa1Ab013Bb6B9de822E536BfCE
 

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$0.00

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Block
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Transfer46411122017-11-29 1:51:112555 days ago1511920271IN
0xF0E3eD8c...2E536BfCE
0.01 ETH0.0010521550

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42740092017-09-14 18:44:572630 days ago1505414697
0xF0E3eD8c...2E536BfCE
 Contract Creation0 ETH
42740092017-09-14 18:44:572630 days ago1505414697
0xF0E3eD8c...2E536BfCE
 Contract Creation0 ETH
42740092017-09-14 18:44:572630 days ago1505414697
0xF0E3eD8c...2E536BfCE
 Contract Creation0 ETH
42740092017-09-14 18:44:572630 days ago1505414697  Contract Creation0 ETH
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Contract Source Code Verified (Exact Match)

Contract Name:
GVOptionProgram

Compiler Version
v0.4.16+commit.d7661dd9

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion
/**
 *Submitted for verification at Etherscan.io on 2017-09-14
*/

pragma solidity ^0.4.11;

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

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

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


/**
 * @title ERC20Basic
 * @dev Simpler version of ERC20 interface
 * @dev see https://github.com/ethereum/EIPs/issues/179
 */
contract ERC20Basic {
  uint256 public totalSupply;
  function balanceOf(address who) constant returns (uint256);
  function transfer(address to, uint256 value) returns (bool);
  event Transfer(address indexed from, address indexed to, uint256 value);
}

/**
 * @title Basic token
 * @dev Basic version of StandardToken, with no allowances. 
 */
contract BasicToken is ERC20Basic {
  using SafeMath for uint256;

  mapping(address => uint256) balances;

  /**
  * @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) returns (bool) {
    balances[msg.sender] = balances[msg.sender].sub(_value);
    balances[_to] = balances[_to].add(_value);
    Transfer(msg.sender, _to, _value);
    return true;
  }

  /**
  * @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) constant returns (uint256 balance) {
    return balances[_owner];
  }

}


/**
 * @title ERC20 interface
 * @dev see https://github.com/ethereum/EIPs/issues/20
 */
contract ERC20 is ERC20Basic {
  function allowance(address owner, address spender) constant returns (uint256);
  function transferFrom(address from, address to, uint256 value) returns (bool);
  function approve(address spender, uint256 value) returns (bool);
  event Approval(address indexed owner, address indexed spender, 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 StandardToken is ERC20, BasicToken {

  mapping (address => mapping (address => uint256)) allowed;


  /**
   * @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 amout of tokens to be transfered
   */
  function transferFrom(address _from, address _to, uint256 _value) returns (bool) {
    var _allowance = allowed[_from][msg.sender];

    // Check is not needed because sub(_allowance, _value) will already throw if this condition is not met
    // require (_value <= _allowance);

    balances[_to] = balances[_to].add(_value);
    balances[_from] = balances[_from].sub(_value);
    allowed[_from][msg.sender] = _allowance.sub(_value);
    Transfer(_from, _to, _value);
    return true;
  }

  /**
   * @dev Aprove the passed address to spend the specified amount of tokens on behalf of msg.sender.
   * @param _spender The address which will spend the funds.
   * @param _value The amount of tokens to be spent.
   */
  function approve(address _spender, uint256 _value) returns (bool) {

    // To change the approve amount you first have to reduce the addresses`
    //  allowance to zero by calling `approve(_spender, 0)` if it is not
    //  already 0 to mitigate the race condition described here:
    //  https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
    require((_value == 0) || (allowed[msg.sender][_spender] == 0));

    allowed[msg.sender][_spender] = _value;
    Approval(msg.sender, _spender, _value);
    return true;
  }

  /**
   * @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 specifing the amount of tokens still avaible for the spender.
   */
  function allowance(address _owner, address _spender) constant returns (uint256 remaining) {
    return allowed[_owner][_spender];
  }
}

contract GVOptionToken is StandardToken {
    
    address public optionProgram;

    string public name;
    string public symbol;
    uint   public constant decimals = 18;

    uint TOKEN_LIMIT;

    // Modifiers
    modifier optionProgramOnly { require(msg.sender == optionProgram); _; }

    // Constructor
    function GVOptionToken(
        address _optionProgram,
        string _name,
        string _symbol,
        uint _TOKEN_LIMIT
    ) {
        require(_optionProgram != 0);        
        optionProgram = _optionProgram;
        name = _name;
        symbol = _symbol;
        TOKEN_LIMIT = _TOKEN_LIMIT;
    }

    // Create tokens
    function buyOptions(address buyer, uint value) optionProgramOnly {
        require(value > 0);
        require(totalSupply + value <= TOKEN_LIMIT);

        balances[buyer] += value;
        totalSupply += value;
        Transfer(0x0, buyer, value);
    }
    
    function remainingTokensCount() returns(uint) {
        return TOKEN_LIMIT - totalSupply;
    }
    
    // Burn option tokens after execution during ICO
    function executeOption(address addr, uint optionsCount) 
        optionProgramOnly
        returns (uint) {
        if (balances[addr] < optionsCount) {
            optionsCount = balances[addr];
        }
        if (optionsCount == 0) {
            return 0;
        }

        balances[addr] -= optionsCount;
        totalSupply -= optionsCount;

        return optionsCount;
    }
}

contract GVOptionProgram {

    // Constants
    uint constant option30perCent = 26 * 1e16; // GVOT30 tokens per usd cent during option purchase 
    uint constant option20perCent = 24 * 1e16; // GVOT20 tokens per usd cent during option purchase
    uint constant option10perCent = 22 * 1e16; // GVOT10 tokens per usd cent during option purchase
    uint constant token30perCent  = 13684210526315800;  // GVT tokens per usd cent during execution of GVOT30
    uint constant token20perCent  = 12631578947368500;  // GVT tokens per usd cent during execution of GVOT20
    uint constant token10perCent  = 11578947368421100;  // GVT tokens per usd cent during execution of GVOT10

    string public constant option30name = "30% GVOT";
    string public constant option20name = "20% GVOT";
    string public constant option10name = "10% GVOT";

    string public constant option30symbol = "GVOT30";
    string public constant option20symbol = "GVOT20";
    string public constant option10symbol = "GVOT10";

    uint constant option30_TOKEN_LIMIT = 26 * 1e5 * 1e18;
    uint constant option20_TOKEN_LIMIT = 36 * 1e5 * 1e18;
    uint constant option10_TOKEN_LIMIT = 55 * 1e5 * 1e18;

    // Events
    event BuyOptions(address buyer, uint amount, string tx, uint8 optionType);
    event ExecuteOptions(address buyer, uint amount, string tx, uint8 optionType);

    // State variables
    address public gvAgent; // payments bot account
    address public team;    // team account
    address public ico;     

    GVOptionToken public gvOptionToken30;
    GVOptionToken public gvOptionToken20;
    GVOptionToken public gvOptionToken10;

    // Modifiers
    modifier icoOnly { require(msg.sender == ico); _; }
    
    // Constructor
    function GVOptionProgram(address _ico, address _gvAgent, address _team) {
        gvOptionToken30 = new GVOptionToken(this, option30name, option30symbol, option30_TOKEN_LIMIT);
        gvOptionToken20 = new GVOptionToken(this, option20name, option20symbol, option20_TOKEN_LIMIT);
        gvOptionToken10 = new GVOptionToken(this, option10name, option10symbol, option10_TOKEN_LIMIT);
        gvAgent = _gvAgent;
        team = _team;
        ico = _ico;
    }

    // Get remaining tokens for all types of option tokens
    function getBalance() public returns (uint, uint, uint) {
        return (gvOptionToken30.remainingTokensCount(), gvOptionToken20.remainingTokensCount(), gvOptionToken10.remainingTokensCount());
    }

    // Execute options during the ICO token purchase. Priority: GVOT30 -> GVOT20 -> GVOT10
    function executeOptions(address buyer, uint usdCents, string txHash) icoOnly
        returns (uint executedTokens, uint remainingCents) {
        require(usdCents > 0);

        (executedTokens, remainingCents) = executeIfAvailable(buyer, usdCents, txHash, gvOptionToken30, 0, token30perCent);
        if (remainingCents == 0) {
            return (executedTokens, 0);
        }

        uint executed20;
        (executed20, remainingCents) = executeIfAvailable(buyer, remainingCents, txHash, gvOptionToken20, 1, token20perCent);
        if (remainingCents == 0) {
            return (executedTokens + executed20, 0);
        }

        uint executed10;
        (executed10, remainingCents) = executeIfAvailable(buyer, remainingCents, txHash, gvOptionToken10, 2, token10perCent);
        
        return (executedTokens + executed20 + executed10, remainingCents);
    }

    // Buy option tokens. Priority: GVOT30 -> GVOT20 -> GVOT10
    function buyOptions(address buyer, uint usdCents, string txHash) icoOnly {
        require(usdCents > 0);

        var remainUsdCents = buyIfAvailable(buyer, usdCents, txHash, gvOptionToken30, 0, option30perCent);
        if (remainUsdCents == 0) {
            return;
        }

        remainUsdCents = buyIfAvailable(buyer, remainUsdCents, txHash, gvOptionToken20, 1, option20perCent);
        if (remainUsdCents == 0) {
            return;
        }

        remainUsdCents = buyIfAvailable(buyer, remainUsdCents, txHash, gvOptionToken10, 2, option10perCent);
    }   

    // Private functions
    
    function executeIfAvailable(address buyer, uint usdCents, string txHash,
        GVOptionToken optionToken, uint8 optionType, uint optionPerCent)
        private returns (uint executedTokens, uint remainingCents) {
        
        var optionsAmount = usdCents * optionPerCent;
        executedTokens = optionToken.executeOption(buyer, optionsAmount);
        remainingCents = usdCents - (executedTokens / optionPerCent);
        if (executedTokens > 0) {
            ExecuteOptions(buyer, executedTokens, txHash, optionType);
        }
        return (executedTokens, remainingCents);
    }

    function buyIfAvailable(address buyer, uint usdCents, string txHash,
        GVOptionToken optionToken, uint8 optionType, uint optionsPerCent)
        private returns (uint) {
        
        var availableTokens = optionToken.remainingTokensCount(); 
        if (availableTokens > 0) {
            var tokens = usdCents * optionsPerCent;
            if(availableTokens >= tokens) {
                optionToken.buyOptions(buyer, tokens);
                BuyOptions(buyer, tokens, txHash, optionType);
                return 0;
            }
            else {
                optionToken.buyOptions(buyer, availableTokens);
                BuyOptions(buyer, availableTokens, txHash, optionType);
                return usdCents - availableTokens / optionsPerCent;
            }
        }
        return usdCents;
    }
}

Contract Security Audit

Contract ABI

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

0000000000000000000000004E9547D1A1154Ee0451F063c253AD8DC39d5384c0000000000000000000000004ef3cc88299c075623734990baa272a2ed39939f0000000000000000000000005e747502a1c426c1c217cacfa97b076ce06ab9d6

-----Decoded View---------------
Arg [0] : _ico (address): 0x4E9547D1A1154Ee0451F063c253AD8DC39d5384c
Arg [1] : _gvAgent (address): 0x4eF3cC88299C075623734990baA272a2ed39939F
Arg [2] : _team (address): 0x5e747502a1c426c1c217caCFA97b076Ce06aB9D6

-----Encoded View---------------
3 Constructor Arguments found :
Arg [0] : 0000000000000000000000004E9547D1A1154Ee0451F063c253AD8DC39d5384c
Arg [1] : 0000000000000000000000004ef3cc88299c075623734990baa272a2ed39939f
Arg [2] : 0000000000000000000000005e747502a1c426c1c217cacfa97b076ce06ab9d6


Swarm Source

bzzr://31bd23b83c2cf613eaf535b657b9e8efa7a55c9abd86e626685c5a6e8856f5b8

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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.