Data Science(DSC)

{{
  "sources": {
    "DSC.sol": {
      "content": "// Submitted by EthereumHistory (ethereumhistory.com)\npragma solidity ^0.4.22;\r\n\r\nlibrary SafeMath {\r\n  function mul(uint256 a, uint256 b) internal pure returns (uint256) {\r\n    uint256 c = a * b;\r\n    assert(a == 0 || c / a == b);\r\n    return c;\r\n  }\r\n\r\n  function div(uint256 a, uint256 b) internal pure returns (uint256) {\r\n    uint256 c = a / b;\r\n    return c;\r\n  }\r\n\r\n  function sub(uint256 a, uint256 b) internal pure returns (uint256) {\r\n    assert(b <= a);\r\n    return a - b;\r\n  }\r\n\r\n  function add(uint256 a, uint256 b) internal pure returns (uint256) {\r\n    uint256 c = a + b;\r\n    assert(c >= a);\r\n    return c;\r\n  }\r\n}\r\n\r\ncontract ForeignToken {\r\n    function balanceOf(address _owner) constant public returns (uint256);\r\n    function transfer(address _to, uint256 _value) public returns (bool);\r\n}\r\n\r\ncontract ERC20Basic {\r\n    uint256 public totalSupply;\r\n    function balanceOf(address who) public constant returns (uint256);\r\n    function transfer(address to, uint256 value) public returns (bool);\r\n    event Transfer(address indexed from, address indexed to, uint256 value);\r\n}\r\n\r\ncontract ERC20 is ERC20Basic {\r\n    function allowance(address owner, address spender) public constant returns (uint256);\r\n    function transferFrom(address from, address to, uint256 value) public returns (bool);\r\n    function approve(address spender, uint256 value) public returns (bool);\r\n    event Approval(address indexed owner, address indexed spender, uint256 value);\r\n}\r\n\r\ninterface Token { \r\n    function distr(address _to, uint256 _value) external returns (bool);\r\n    function totalSupply() constant external returns (uint256 supply);\r\n    function balanceOf(address _owner) constant external returns (uint256 balance);\r\n}\r\n\r\ncontract DSC is ERC20 {\r\n\r\n \r\n    \r\n    using SafeMath for uint256;\r\n    address owner = msg.sender;\r\n\r\n    mapping (address => uint256) balances;\r\n    mapping (address => mapping (address => uint256)) allowed;\r\n    mapping (address => bool) public blacklist;\r\n\r\n    string public constant name = \"Data Science\";\r\n    string public constant symbol = \"DSC\";\r\n    uint public constant decimals = 4;\r\n    \r\nuint256 public totalSupply = 1000000000e4;\r\n    \r\nuint256 public totalDistributed = 400000000e4;\r\n    \r\nuint256 public totalRemaining = totalSupply.sub(totalDistributed);\r\n    \r\nuint256 public value = 3500e4;\r\n\r\n\r\n\r\n    event Transfer(address indexed _from, address indexed _to, uint256 _value);\r\n    event Approval(address indexed _owner, address indexed _spender, uint256 _value);\r\n    \r\n    event Distr(address indexed to, uint256 amount);\r\n    event DistrFinished();\r\n    \r\n    event Burn(address indexed burner, uint256 value);\r\n\r\n    bool public distributionFinished = false;\r\n    \r\n    modifier canDistr() {\r\n        require(!distributionFinished);\r\n        _;\r\n    }\r\n    \r\n    modifier onlyOwner() {\r\n        require(msg.sender == owner);\r\n        _;\r\n    }\r\n    \r\n    modifier onlyWhitelist() {\r\n        require(blacklist[msg.sender] == false);\r\n        _;\r\n    }\r\n    \r\n    function airtoken () public {\r\n        owner = msg.sender;\r\n        balances[owner] = totalDistributed;\r\n    }\r\n    \r\n    function transferOwnership(address newOwner) onlyOwner public {\r\n        if (newOwner != address(0)) {\r\n            owner = newOwner;\r\n        }\r\n    }\r\n    \r\n    function finishDistribution() onlyOwner canDistr public returns (bool) {\r\n        distributionFinished = true;\r\n        emit DistrFinished();\r\n        return true;\r\n    }\r\n    \r\n    function distr(address _to, uint256 _amount) canDistr private returns (bool) {\r\n        totalDistributed = totalDistributed.add(_amount);\r\n        totalRemaining = totalRemaining.sub(_amount);\r\n        balances[_to] = balances[_to].add(_amount);\r\n        emit Distr(_to, _amount);\r\n        emit Transfer(address(0), _to, _amount);\r\n        return true;\r\n        \r\n        if (totalDistributed >= totalSupply) {\r\n            distributionFinished = true;\r\n        }\r\n    }\r\n    \r\n    function () external payable {\r\n        getTokens();\r\n     }\r\n    \r\n    function getTokens() payable canDistr onlyWhitelist public {\r\n        if (value > totalRemaining) {\r\n            value = totalRemaining;\r\n        }\r\n        \r\n        require(value <= totalRemaining);\r\n        \r\n        address investor = msg.sender;\r\n        uint256 toGive = value;\r\n        \r\n        distr(investor, toGive);\r\n        \r\n        if (toGive > 0) {\r\n            blacklist[investor] = true;\r\n        }\r\n\r\n        if (totalDistributed >= totalSupply) {\r\n            distributionFinished = true;\r\n        }\r\n        \r\n        value = value.sub(120);\r\n    }\r\n\r\n    function balanceOf(address _owner) constant public returns (uint256) {\r\n        return balances[_owner];\r\n    }\r\n\r\n    modifier onlyPayloadSize(uint size) {\r\n        assert(msg.data.length >= size + 4);\r\n        _;\r\n    }\r\n    \r\n    function transfer(address _to, uint256 _amount) onlyPayloadSize(2 * 32) public returns (bool success) {\r\n        require(_to != address(0));\r\n        require(_amount <= balances[msg.sender]);\r\n        \r\n        balances[msg.sender] = balances[msg.sender].sub(_amount);\r\n        balances[_to] = balances[_to].add(_amount);\r\n        emit Transfer(msg.sender, _to, _amount);\r\n        return true;\r\n    }\r\n    \r\n    function transferFrom(address _from, address _to, uint256 _amount) onlyPayloadSize(3 * 32) public returns \r\n\r\n(bool success) {\r\n        require(_to != address(0));\r\n        require(_amount <= balances[_from]);\r\n        require(_amount <= allowed[_from][msg.sender]);\r\n        \r\n        balances[_from] = balances[_from].sub(_amount);\r\n        allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(_amount);\r\n        balances[_to] = balances[_to].add(_amount);\r\n        emit Transfer(_from, _to, _amount);\r\n        return true;\r\n    }\r\n    \r\n    function approve(address _spender, uint256 _value) public returns (bool success) {\r\n        if (_value != 0 && allowed[msg.sender][_spender] != 0) { return false; }\r\n        allowed[msg.sender][_spender] = _value;\r\n        emit Approval(msg.sender, _spender, _value);\r\n        return true;\r\n    }\r\n    \r\n    function allowance(address _owner, address _spender) constant public returns (uint256) {\r\n        return allowed[_owner][_spender];\r\n    }\r\n    \r\n    function getTokenBalance(address tokenAddress, address who) constant public returns (uint){\r\n        ForeignToken t = ForeignToken(tokenAddress);\r\n        uint bal = t.balanceOf(who);\r\n        return bal;\r\n    }\r\n    \r\n    function withdraw() onlyOwner public {\r\n        uint256 etherBalance = address(this).balance;\r\n        owner.transfer(etherBalance);\r\n    }\r\n    \r\n    function burn(uint256 _value) onlyOwner public {\r\n        require(_value <= balances[msg.sender]);\r\n\r\n        address burner = msg.sender;\r\n        balances[burner] = balances[burner].sub(_value);\r\n        totalSupply = totalSupply.sub(_value);\r\n        totalDistributed = totalDistributed.sub(_value);\r\n        emit Burn(burner, _value);\r\n    }\r\n    \r\n    function withdrawForeignTokens(address _tokenContract) onlyOwner public returns (bool) {\r\n        ForeignToken token = ForeignToken(_tokenContract);\r\n        uint256 amount = token.balanceOf(address(this));\r\n        return token.transfer(owner, amount);\r\n    }\r\n}"
    }
  },
  "language": "Solidity",
  "settings": {
    "optimizer": {
      "runs": 200,
      "enabled": true
    },
    "outputSelection": {
      "*": {
        "*": [
          "evm.bytecode",
          "evm.deployedBytecode",
          "devdoc",
          "userdoc",
          "metadata",
          "abi"
        ]
      }
    }
  }
}}