Token USD Coin
Overview ERC-20
Total Supply:
100,000,000 USDC
Holders:
22 addresses
Profile Summary
Contract:
Decimals:
6
Balance
5.3 USDC
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# | Exchange | Pair | Price | 24H Volume | % Volume |
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Contract Name:
UChildERC20Proxy
Compiler Version
v0.6.12+commit.27d51765
Optimization Enabled:
Yes with 9999 runs
Other Settings:
default evmVersion
Contract Source Code (Solidity Standard Json-Input format)
/** *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) {} }
{ "optimizer": { "enabled": true, "runs": 9999 }, "outputSelection": { "*": { "*": [ "evm.bytecode", "evm.deployedBytecode", "abi" ] } }, "libraries": {} }
[{"inputs":[{"internalType":"address","name":"_proxyTo","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"_new","type":"address"},{"indexed":false,"internalType":"address","name":"_old","type":"address"}],"name":"ProxyOwnerUpdate","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"_new","type":"address"},{"indexed":true,"internalType":"address","name":"_old","type":"address"}],"name":"ProxyUpdated","type":"event"},{"stateMutability":"payable","type":"fallback"},{"inputs":[],"name":"IMPLEMENTATION_SLOT","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"OWNER_SLOT","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"implementation","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"proxyOwner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"proxyType","outputs":[{"internalType":"uint256","name":"proxyTypeId","type":"uint256"}],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferProxyOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_newProxyTo","type":"address"},{"internalType":"bytes","name":"data","type":"bytes"}],"name":"updateAndCall","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"_newProxyTo","type":"address"}],"name":"updateImplementation","outputs":[],"stateMutability":"nonpayable","type":"function"},{"stateMutability":"payable","type":"receive"}]
Contract Creation Code
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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)
00000000000000000000000050b9bb2520fa00abce4289ef867995b28f75701b
-----Decoded View---------------
Arg [0] : _proxyTo (address): 0x50b9bb2520fa00abce4289ef867995b28f75701b
-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 00000000000000000000000050b9bb2520fa00abce4289ef867995b28f75701b