{
  "contractName": "StandardToken",
  "abi": [
    {
      "constant": true,
      "inputs": [],
      "name": "totalSupply",
      "outputs": [
        {
          "name": "",
          "type": "uint256"
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      "name": "Approval",
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          "name": "from",
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      "name": "increaseApproval",
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      "name": "decreaseApproval",
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          "type": "bool"
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      ],
      "payable": false,
      "stateMutability": "nonpayable",
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  "source": "pragma solidity ^0.4.24;\n\nimport \"./BasicToken.sol\";\nimport \"./ERC20.sol\";\n\n\n/**\n * @title Standard ERC20 token\n *\n * @dev Implementation of the basic standard token.\n * https://github.com/ethereum/EIPs/issues/20\n * Based on code by FirstBlood: https://github.com/Firstbloodio/token/blob/master/smart_contract/FirstBloodToken.sol\n */\ncontract StandardToken is ERC20, BasicToken {\n\n  mapping (address => mapping (address => uint256)) internal allowed;\n\n\n  /**\n   * @dev Transfer tokens from one address to another\n   * @param _from address The address which you want to send tokens from\n   * @param _to address The address which you want to transfer to\n   * @param _value uint256 the amount of tokens to be transferred\n   */\n  function transferFrom(\n    address _from,\n    address _to,\n    uint256 _value\n  )\n    public\n    returns (bool)\n  {\n    require(_value <= balances[_from]);\n    require(_value <= allowed[_from][msg.sender]);\n    require(_to != address(0));\n\n    balances[_from] = balances[_from].sub(_value);\n    balances[_to] = balances[_to].add(_value);\n    allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(_value);\n    emit Transfer(_from, _to, _value);\n    return true;\n  }\n\n  /**\n   * @dev Approve the passed address to spend the specified amount of tokens on behalf of msg.sender.\n   * Beware that changing an allowance with this method brings the risk that someone may use both the old\n   * and the new allowance by unfortunate transaction ordering. One possible solution to mitigate this\n   * race condition is to first reduce the spender's allowance to 0 and set the desired value afterwards:\n   * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729\n   * @param _spender The address which will spend the funds.\n   * @param _value The amount of tokens to be spent.\n   */\n  function approve(address _spender, uint256 _value) public returns (bool) {\n    allowed[msg.sender][_spender] = _value;\n    emit Approval(msg.sender, _spender, _value);\n    return true;\n  }\n\n  /**\n   * @dev Function to check the amount of tokens that an owner allowed to a spender.\n   * @param _owner address The address which owns the funds.\n   * @param _spender address The address which will spend the funds.\n   * @return A uint256 specifying the amount of tokens still available for the spender.\n   */\n  function allowance(\n    address _owner,\n    address _spender\n   )\n    public\n    view\n    returns (uint256)\n  {\n    return allowed[_owner][_spender];\n  }\n\n  /**\n   * @dev Increase the amount of tokens that an owner allowed to a spender.\n   * approve should be called when allowed[_spender] == 0. To increment\n   * allowed value is better to use this function to avoid 2 calls (and wait until\n   * the first transaction is mined)\n   * From MonolithDAO Token.sol\n   * @param _spender The address which will spend the funds.\n   * @param _addedValue The amount of tokens to increase the allowance by.\n   */\n  function increaseApproval(\n    address _spender,\n    uint256 _addedValue\n  )\n    public\n    returns (bool)\n  {\n    allowed[msg.sender][_spender] = (\n      allowed[msg.sender][_spender].add(_addedValue));\n    emit Approval(msg.sender, _spender, allowed[msg.sender][_spender]);\n    return true;\n  }\n\n  /**\n   * @dev Decrease the amount of tokens that an owner allowed to a spender.\n   * approve should be called when allowed[_spender] == 0. To decrement\n   * allowed value is better to use this function to avoid 2 calls (and wait until\n   * the first transaction is mined)\n   * From MonolithDAO Token.sol\n   * @param _spender The address which will spend the funds.\n   * @param _subtractedValue The amount of tokens to decrease the allowance by.\n   */\n  function decreaseApproval(\n    address _spender,\n    uint256 _subtractedValue\n  )\n    public\n    returns (bool)\n  {\n    uint256 oldValue = allowed[msg.sender][_spender];\n    if (_subtractedValue >= oldValue) {\n      allowed[msg.sender][_spender] = 0;\n    } else {\n      allowed[msg.sender][_spender] = oldValue.sub(_subtractedValue);\n    }\n    emit Approval(msg.sender, _spender, allowed[msg.sender][_spender]);\n    return true;\n  }\n\n}\n",
  "sourcePath": "zeppelin-solidity/contracts/token/ERC20/StandardToken.sol",
  "ast": {
    "absolutePath": "zeppelin-solidity/contracts/token/ERC20/StandardToken.sol",
    "exportedSymbols": {
      "StandardToken": [
        827
      ]
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      },
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        "symbolAliases": [],
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      },
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              "typeDescriptions": {
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        "contractKind": "contract",
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        "nodeType": "ContractDefinition",
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            "storageLocation": "default",
            "typeDescriptions": {
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            },
            "documentation": "@dev Decrease the amount of tokens that an owner allowed to a spender.\napprove should be called when allowed[_spender] == 0. To decrement\nallowed value is better to use this function to avoid 2 calls (and wait until\nthe first transaction is mined)\nFrom MonolithDAO Token.sol\n@param _spender The address which will spend the funds.\n@param _subtractedValue The amount of tokens to decrease the allowance by.",
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                  "stateVariable": false,
                  "storageLocation": "default",
                  "typeDescriptions": {
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              ],
              "src": "3784:6:8"
            },
            "scope": 827,
            "src": "3679:432:8",
            "stateMutability": "nonpayable",
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            "visibility": "public"
          }
        ],
        "scope": 828,
        "src": "334:3780:8"
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    "src": "0:4115:8"
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  "compiler": {
    "name": "solc",
    "version": "0.4.24+commit.e67f0147.Emscripten.clang"
  },
  "networks": {},
  "schemaVersion": "2.0.1",
  "updatedAt": "2018-10-15T23:58:33.895Z"
}