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•  contract NFTBrokerProxy *
•    - function getTargetSlot()
•    - function getTarget()
•    - function setTargetSlot(address target ...
•    - function setTarget(address target)
•    - function getOwnerSlot()
•    - function getOwner()
•    - function setOwnerSlot(address owner)
•    - function setOwner(address owner)
•    - function transferOwnership(address ne ...

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/**
 *Submitted for verification at Etherscan.io on 2022-01-15
*/

// SPDX-License-Identifier: UNLICENSED

pragma solidity 0.8.4;

/*
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|                                  |
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|+ $ + $ + $ + $ + $ + $ + $ + $ + |
| + $ + $ + $ + $ + $ + $ + $ + $ +|
|$ + $ + $ + $ + $ + $ + $ + $ + $ |
| $ + $ + $ + $ + $ + $ + $ + $ + $|
|+ $ + $ + $ + $ + $ + $ + $ + $ + |
| + $ + $ + $ + $ + $ + $ + $ + $ +|
|__________________________________|

*/

contract NFTBrokerProxy {

    modifier onlyOwner() {
        require(msg.sender == getOwner(), "caller not the owner");
        _;
    }

    constructor (address target) {
        setTargetSlot(target);
        setOwnerSlot(tx.origin);
    }

    fallback() external payable {
        address target = getTargetSlot();
        assembly {
            calldatacopy(0, 0, calldatasize())
            let result := delegatecall(gas(), target, 0, calldatasize(), 0, 0)
            returndatacopy(0, 0, returndatasize())
            switch result
            case 0 {
                revert(0, returndatasize())
            }
            default {
                return(0, returndatasize())
            }
        }
    }

    receive() external payable {}

    /**
     * @dev Gets proxy target address from storage slot.
     * @return target Address of smart contract source code.
     */
    function getTargetSlot() internal view returns (address target) {
        // The slot hash has been precomputed for gas optimizaion
        // bytes32 slot = bytes32(uint256(keccak256('eip1967.CXIP.NFTBrokerProxy.target')) - 1);
        assembly {
            target := sload(
                /* slot */
                0x172d303713ab541af50b05036cc57f0c0c8733f85d5ceb2137350b11166ad9bd
            )
        }
    }

    function getTarget() public view returns (address target) {
        return getTargetSlot();
    }

    /**
     * @dev Sets proxy target address to storage slot.
     * @param target Address of smart contract source code.
     */
    function setTargetSlot(address target) internal {
        // The slot hash has been precomputed for gas optimizaion
        // bytes32 slot = bytes32(uint256(keccak256('eip1967.CXIP.NFTBrokerProxy.target')) - 1);
        assembly {
            sstore(
                /* slot */
                0x172d303713ab541af50b05036cc57f0c0c8733f85d5ceb2137350b11166ad9bd,
                target
            )
        }
    }

    function setTarget(address target) public onlyOwner {
        setTargetSlot(target);
    }

    /**
     * @dev Gets proxy owner address from storage slot.
     * @return owner Address of owner.
     */
    function getOwnerSlot() internal view returns (address owner) {
        // The slot hash has been precomputed for gas optimizaion
        // bytes32 slot = bytes32(uint256(keccak256('eip1967.CXIP.NFTBrokerProxy.owner')) - 1);
        assembly {
            owner := sload(
                /* slot */
                0x2d33df155922a1acf3c04048b6cc8aa3f641ab2dc6ecf84d346b5653b679e017
            )
        }
    }

    function getOwner() public view returns (address owner) {
        return getOwnerSlot();
    }

    /**
     * @dev Sets proxy owner address to storage slot.
     * @param owner Address of owner.
     */
    function setOwnerSlot(address owner) internal {
        // The slot hash has been precomputed for gas optimizaion
        // bytes32 slot = bytes32(uint256(keccak256('eip1967.CXIP.NFTBrokerProxy.owner')) - 1);
        assembly {
            sstore(
                /* slot */
                0x2d33df155922a1acf3c04048b6cc8aa3f641ab2dc6ecf84d346b5653b679e017,
                owner
            )
        }
    }

    function setOwner(address owner) public onlyOwner {
        setOwnerSlot(owner);
    }

    function transferOwnership(address newOwner) public onlyOwner {
        require(newOwner != address(0), "cannot use zero address");
        setOwner(newOwner);
    }

}

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[{"inputs":[{"internalType":"address","name":"target","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"stateMutability":"payable","type":"fallback"},{"inputs":[],"name":"getOwner","outputs":[{"internalType":"address","name":"owner","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getTarget","outputs":[{"internalType":"address","name":"target","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"}],"name":"setOwner","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"target","type":"address"}],"name":"setTarget","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"stateMutability":"payable","type":"receive"}]

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0000000000000000000000006caf521f79f774a949f4e8d6ca3c4b4945169b71

-----Decoded View---------------
Arg [0] : target (address): 0x6CaF521F79f774A949F4e8d6ca3C4B4945169B71

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 0000000000000000000000006caf521f79f774a949f4e8d6ca3c4b4945169b71

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ipfs://5b81b117e7fe0ba8239f826aee71deee38b4f23c604950321f7362799dcc95d6