智能合约与区块链的结合形成了智能合约法规自动执行系统，该系统有三个重要的原则：

　　首先，智能合约数据来源于链上。这是指智能合约的输入是从区块链的 数据库里面出来的。这些数据是由区块链保证的，具有真实难以篡改的特征。

　　其次，智能合约的执行在链上。这是指智能合约是在多个节点上面执行，而所执行的结果必须是相同，智能合约所出的结果一定要被共识才能被接受。

　　再者，智能合约输出在链上。这是指智能合约的输出结果必须存在区块链上面，这样保证结果的真实与可追溯性，并且为其他相衔接的智能合约提供输入数据的准确性保障。

　　File 1 of 4: OwnedUpgradeabilityProxy.sol

pragma solidity ^0.4.24;

import './UpgradeabilityProxy.sol';

/**

• @title OwnedUpgradeabilityProxy
• @dev This contract combines an upgradeability proxy with basic authorization control functionalities

*/ contract OwnedUpgradeabilityProxy is UpgradeabilityProxy { /**

• @dev Event to show ownership has been transferred
• @param previousOwner representing the address of the previous owner
• @param newOwner representing the address of the new owner

*/ event ProxyOwnershipTransferred(address previousOwner, address newOwner);

// Storage position of the owner of the contract bytes32 private constant proxyOwnerPosition = keccak256("org.zeppelinos.proxy.owner");

/**

• @dev the constructor sets the original owner of the contract to the sender account.

*/ constructor() public {

setUpgradeabilityOwner(msg.sender);

}

/**

• @dev Throws if called by any account other than the owner.

*/ modifier onlyProxyOwner() {

require(msg.sender == proxyOwner());_;

}

/**

• @dev Tells the address of the owner
• @return the address of the owner

*/ function proxyOwner() public view returns (address owner) {

bytes32 position = proxyOwnerPosition;assembly {
  owner := sload(position)}

}

/**

• @dev Sets the address of the owner

*/ function setUpgradeabilityOwner(address newProxyOwner) internal {

bytes32 position = proxyOwnerPosition;assembly {
  sstore(position, newProxyOwner)}

}

/**

• @dev Allows the current owner to transfer control of the contract to a newOwner.
• @param newOwner The address to transfer ownership to.

*/ function transferProxyOwnership(address newOwner) public onlyProxyOwner {

require(newOwner != address(0));emit ProxyOwnershipTransferred(proxyOwner(), newOwner);setUpgradeabilityOwner(newOwner);

}

/**

• @dev Allows the proxy owner to upgrade the current version of the proxy.
• @param implementation representing the address of the new implementation to be set.

*/ function upgradeTo(address implementation) public onlyProxyOwner {

_upgradeTo(implementation);

}

/**

• @dev Allows the proxy owner to upgrade the current version of the proxy and call the new implementation
• to initialize whatever is needed through a low level call.
• @param implementation representing the address of the new implementation to be set.
• @param data represents the msg.data to bet sent in the low level call. This parameter may include the function
• signature of the implementation to be called with the needed payload

*/ function upgradeToAndCall(address implementation, bytes data) payable public onlyProxyOwner {

upgradeTo(implementation);require(implementation.delegatecall(data));

}