迪斯克質押眾籌模式系統開發詳情

　　區塊鏈智慧合約是一種基於區塊鏈技術的自動化合約。開發+l8l-案例259l-系統3365微電它是一種能夠自動執行合約條款、

不需要人類介入而能夠保證執行結果的計算機程式。智慧合約實際上是一段可程式設計的程式碼，這段程式碼會被上傳到區塊鏈上，並

在區塊鏈中被執行，以實現合約所預期的功能。這樣，同樣的程式碼邏輯可以被多方審計和驗證，從而保證各方的利益得以最大化

。

　　智慧合約隸屬於區塊鏈技術的智慧合約系統，它包含了一系列的分散式賬本（區塊鏈）以及對這個分散式賬本進行的操作過

程。智慧合約的主要特點是：去中心化、透明性、不可篡改性以及不可撤銷性。因此，智慧合約具有高度的安全性和準確性，

能夠確保交易的順利完成。

/**

 *Submitted for verification at Etherscan.io on 2017-11-28

*/

pragma solidity ^0.4.17;

/**

 * @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;

    }

}

/**

 * @title Ownable

 * @dev The Ownable contract has an owner address, and provides basic authorization control

 * functions, this simplifies the implementation of "user permissions".

 */

contract Ownable {

    address public owner;

    /**

      * @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 {

        if (newOwner != address(0)) {

            owner = newOwner;

        }

    }

}

/**

 * @title ERC20Basic

 * @dev Simpler version of ERC20 interface

 * @dev see

 */

contract ERC20Basic {

    uint public _totalSupply;

    function totalSupply() public constant returns (uint);

    function balanceOf(address who) public constant returns (uint);

    function transfer(address to, uint value) public;

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

}