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• interface IERCProxy
•    - function proxyType()
•    - function implementation()
•    - function delegatedFwd(address _dst, b ...
•    - function proxyType()
•    - function implementation()
•  contract UpgradableProxy is Proxy
•    - function proxyOwner()
•    - function loadProxyOwner()
•    - function implementation()
•    - function loadImplementation()
•    - function transferProxyOwnership(addre ...
•    - function setProxyOwner(address newOwn ...
•    - function updateImplementation(address ...
•    - function updateAndCall(address _newPr ...
•    - function setImplementation(address _n ...
•    - function isContract(address _target)
•  contract UChildERC20Proxy is Upgra ... *

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/**
 *Submitted for verification at polygonscan.com on 2021-06-09
*/

// SPDX-License-Identifier: MIT

// File: contracts/lib/Proxy/IERCProxy.sol

pragma solidity 0.6.12;

interface IERCProxy {
    function proxyType() external pure returns (uint256 proxyTypeId);

    function implementation() external view returns (address codeAddr);
}

// File: contracts/lib/Proxy/Proxy.sol

pragma solidity 0.6.12;

abstract contract Proxy is IERCProxy {
    function delegatedFwd(address _dst, bytes memory _calldata) internal {
        // solium-disable-next-line security/no-inline-assembly
        assembly {
            let result := delegatecall(
                sub(gas(), 10000),
                _dst,
                add(_calldata, 0x20),
                mload(_calldata),
                0,
                0
            )
            let size := returndatasize()

            let ptr := mload(0x40)
            returndatacopy(ptr, 0, size)

            // revert instead of invalid() bc if the underlying call failed with invalid() it already wasted gas.
            // if the call returned error data, forward it
            switch result
                case 0 {
                    revert(ptr, size)
                }
                default {
                    return(ptr, size)
                }
        }
    }

    function proxyType()
        external
        virtual
        override
        pure
        returns (uint256 proxyTypeId)
    {
        // Upgradeable proxy
        proxyTypeId = 2;
    }

    function implementation() external virtual override view returns (address);
}

// File: contracts/lib/Proxy/UpgradableProxy.sol

pragma solidity 0.6.12;

contract UpgradableProxy is Proxy {
    event ProxyUpdated(address indexed _new, address indexed _old);
    event ProxyOwnerUpdate(address _new, address _old);

    bytes32 public constant IMPLEMENTATION_SLOT = keccak256(
        "matic.network.proxy.implementation"
    );
    bytes32 public constant OWNER_SLOT = keccak256("matic.network.proxy.owner");

    constructor(address _proxyTo) public {
        setProxyOwner(msg.sender);
        setImplementation(_proxyTo);
    }

    fallback() external payable {
        delegatedFwd(loadImplementation(), msg.data);
    }

    receive() external payable {
        delegatedFwd(loadImplementation(), msg.data);
    }

    modifier onlyProxyOwner() {
        require(loadProxyOwner() == msg.sender, "NOT_OWNER");
        _;
    }

    function proxyOwner() external view returns (address) {
        return loadProxyOwner();
    }

    function loadProxyOwner() internal view returns (address) {
        address _owner;
        bytes32 position = OWNER_SLOT;
        assembly {
            _owner := sload(position)
        }
        return _owner;
    }

    function implementation() external override view returns (address) {
        return loadImplementation();
    }

    function loadImplementation() internal view returns (address) {
        address _impl;
        bytes32 position = IMPLEMENTATION_SLOT;
        assembly {
            _impl := sload(position)
        }
        return _impl;
    }

    function transferProxyOwnership(address newOwner) public onlyProxyOwner {
        require(newOwner != address(0), "ZERO_ADDRESS");
        emit ProxyOwnerUpdate(newOwner, loadProxyOwner());
        setProxyOwner(newOwner);
    }

    function setProxyOwner(address newOwner) private {
        bytes32 position = OWNER_SLOT;
        assembly {
            sstore(position, newOwner)
        }
    }

    function updateImplementation(address _newProxyTo) public onlyProxyOwner {
        require(_newProxyTo != address(0x0), "INVALID_PROXY_ADDRESS");
        require(
            isContract(_newProxyTo),
            "DESTINATION_ADDRESS_IS_NOT_A_CONTRACT"
        );

        emit ProxyUpdated(_newProxyTo, loadImplementation());

        setImplementation(_newProxyTo);
    }

    function updateAndCall(address _newProxyTo, bytes memory data)
        public
        payable
        onlyProxyOwner
    {
        updateImplementation(_newProxyTo);

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returnData) = address(this).call{
            value: msg.value
        }(data);
        require(success, string(returnData));
    }

    function setImplementation(address _newProxyTo) private {
        bytes32 position = IMPLEMENTATION_SLOT;
        assembly {
            sstore(position, _newProxyTo)
        }
    }

    function isContract(address _target) internal view returns (bool) {
        if (_target == address(0)) {
            return false;
        }

        uint256 size;
        assembly {
            size := extcodesize(_target)
        }
        return size > 0;
    }
}

// File: contracts/UChildERC20Proxy.sol

pragma solidity 0.6.12;

contract UChildERC20Proxy is UpgradableProxy {
    constructor(address _proxyTo) public UpgradableProxy(_proxyTo) {}
}

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000000000000000000000000dd9185db084f5c4fff3b4f70e7ba62123b812226

-----Decoded View---------------
Arg [0] : _proxyTo (address): 0xDD9185DB084f5C4fFf3b4f70E7bA62123b812226

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 000000000000000000000000dd9185db084f5c4fff3b4f70e7ba62123b812226

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ipfs://696f7ae6f368606e2fb937629b8621028df4794f0d256c4f4b869fbe6350edcb