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•  contract Owned
•    - function nominateNewOwner(address _ow ...
•    - function acceptOwnership()
•    - function _onlyOwner()
•  contract DappMaintenance is Owned *
•    - function setMaintenanceModeAll(bool i ...
•    - function setMaintenanceModeStaking(bo ...
•    - function setMaintenanceModeSX(bool is ...

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/**
 *Submitted for verification at sepolia-optimism.etherscan.io on 2023-12-11
*/

/*
   ____            __   __        __   _
  / __/__ __ ___  / /_ / /  ___  / /_ (_)__ __
 _\ \ / // // _ \/ __// _ \/ -_)/ __// / \ \ /
/___/ \_, //_//_/\__//_//_/\__/ \__//_/ /_\_\
     /___/

* Synthetix: DappMaintenance.sol
*
* Latest source (may be newer): https://github.com/Synthetixio/synthetix/blob/master/contracts/DappMaintenance.sol
* Docs: https://docs.synthetix.io/contracts/DappMaintenance
*
* Contract Dependencies: 
*	- Owned
* Libraries: (none)
*
* MIT License
* ===========
*
* Copyright (c) 2023 Synthetix
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
*/



pragma solidity ^0.5.16;

// https://docs.synthetix.io/contracts/source/contracts/owned
contract Owned {
    address public owner;
    address public nominatedOwner;

    constructor(address _owner) public {
        require(_owner != address(0), "Owner address cannot be 0");
        owner = _owner;
        emit OwnerChanged(address(0), _owner);
    }

    function nominateNewOwner(address _owner) external onlyOwner {
        nominatedOwner = _owner;
        emit OwnerNominated(_owner);
    }

    function acceptOwnership() external {
        require(msg.sender == nominatedOwner, "You must be nominated before you can accept ownership");
        emit OwnerChanged(owner, nominatedOwner);
        owner = nominatedOwner;
        nominatedOwner = address(0);
    }

    modifier onlyOwner {
        _onlyOwner();
        _;
    }

    function _onlyOwner() private view {
        require(msg.sender == owner, "Only the contract owner may perform this action");
    }

    event OwnerNominated(address newOwner);
    event OwnerChanged(address oldOwner, address newOwner);
}


// https://docs.synthetix.io/contracts/source/contracts/dappmaintenance

/**
 * @title DappMaintenance contract.
 * @dev When the Synthetix system is on maintenance (upgrade, release...etc) the dApps also need
 * to be put on maintenance so no transactions can be done. The DappMaintenance contract is here to keep a state of
 * the dApps which indicates if yes or no, they should be up or down.
 */
contract DappMaintenance is Owned {
    bool public isPausedStaking = false;
    bool public isPausedSX = false;

    /**
     * @dev Constructor
     */
    constructor(address _owner) public Owned(_owner) {
        require(_owner != address(0), "Owner address cannot be 0");
        owner = _owner;
        emit OwnerChanged(address(0), _owner);
    }

    function setMaintenanceModeAll(bool isPaused) external onlyOwner {
        isPausedStaking = isPaused;
        isPausedSX = isPaused;
        emit StakingMaintenance(isPaused);
        emit SXMaintenance(isPaused);
    }

    function setMaintenanceModeStaking(bool isPaused) external onlyOwner {
        isPausedStaking = isPaused;
        emit StakingMaintenance(isPausedStaking);
    }

    function setMaintenanceModeSX(bool isPaused) external onlyOwner {
        isPausedSX = isPaused;
        emit SXMaintenance(isPausedSX);
    }

    event StakingMaintenance(bool isPaused);
    event SXMaintenance(bool isPaused);
}

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00000000000000000000000048914229dedd5a9922f44441ffccfc2cb7856ee9

-----Decoded View---------------
Arg [0] : _owner (address): 0x48914229deDd5A9922f44441ffCCfC2Cb7856Ee9

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 00000000000000000000000048914229dedd5a9922f44441ffccfc2cb7856ee9

SafeDecimalMath : 0x2ad7ccaac0eeb396c3a5fc2b73a885435688c0d5
SystemSettingsLib : 0x343b5efcbf331957d3f4236eb16c338d7256f62d
SignedSafeDecimalMath : 0xc7dcc0929881530d3386de51d9ffdd35b8009c6e
ExchangeSettlementLib : 0x3f60ffaef1ebd84e3c2d0c9c0e12388365d5df12