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contract
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0x1bfc26cE035c368503fAE319Cc2596716428ca44
- Token
- USD Coin (PoS) (USDC)
- Creator
- 0x1548cf–d21b60 at 0x1801d5–4c17c9
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- 0 CELO ( )
- Locked CELO Balance
- 0.00 CELO
- Voting CELO Balance
- 0.00 CELO
- Pending Unlocked Gold
- 0.00 CELO
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- 2,290 Transactions
- Transfers
- 5 Transfers
- Gas Used
- 66,201,928
- Last Balance Update
- 27595831
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Contract is not verified. However, we found a verified contract with the same bytecode in Blockscout DB 0x29dfce9c22003a4999930382fd00f9fd6133acd1.
All metadata displayed below is from that contract. In order to verify current contract, click Verify & Publish button
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- Contract name:
- UpgradeBeaconProxy
- Optimization enabled
- true
- Compiler version
- v0.7.6+commit.7338295f
- Optimization runs
- 999999
- Verified at
- 2024-03-11T23:47:03.098205Z
@celo-org/optics-sol/contracts/upgrade/UpgradeBeaconProxy.sol
// SPDX-License-Identifier: MIT pragma solidity >=0.6.11; // ============ External Imports ============ import {Address} from "@openzeppelin/contracts/utils/Address.sol"; /** * @title UpgradeBeaconProxy * @notice * Proxy contract which delegates all logic, including initialization, * to an implementation contract. * The implementation contract is stored within an Upgrade Beacon contract; * the implementation contract can be changed by performing an upgrade on the Upgrade Beacon contract. * The Upgrade Beacon contract for this Proxy is immutably specified at deployment. * @dev This implementation combines the gas savings of keeping the UpgradeBeacon address outside of contract storage * found in 0age's implementation: * https://github.com/dharma-eng/dharma-smart-wallet/blob/master/contracts/proxies/smart-wallet/UpgradeBeaconProxyV1.sol * With the added safety checks that the UpgradeBeacon and implementation are contracts at time of deployment * found in OpenZeppelin's implementation: * https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/proxy/beacon/BeaconProxy.sol */ contract UpgradeBeaconProxy { // ============ Immutables ============ // Upgrade Beacon address is immutable (therefore not kept in contract storage) address private immutable upgradeBeacon; // ============ Constructor ============ /** * @notice Validate that the Upgrade Beacon is a contract, then set its * address immutably within this contract. * Validate that the implementation is also a contract, * Then call the initialization function defined at the implementation. * The deployment will revert and pass along the * revert reason if the initialization function reverts. * @param _upgradeBeacon Address of the Upgrade Beacon to be stored immutably in the contract * @param _initializationCalldata Calldata supplied when calling the initialization function */ constructor(address _upgradeBeacon, bytes memory _initializationCalldata) payable { // Validate the Upgrade Beacon is a contract require(Address.isContract(_upgradeBeacon), "beacon !contract"); // set the Upgrade Beacon upgradeBeacon = _upgradeBeacon; // Validate the implementation is a contract address _implementation = _getImplementation(_upgradeBeacon); require( Address.isContract(_implementation), "beacon implementation !contract" ); // Call the initialization function on the implementation if (_initializationCalldata.length > 0) { _initialize(_implementation, _initializationCalldata); } } // ============ External Functions ============ /** * @notice Forwards all calls with data to _fallback() * No public functions are declared on the contract, so all calls hit fallback */ fallback() external payable { _fallback(); } /** * @notice Forwards all calls with no data to _fallback() */ receive() external payable { _fallback(); } // ============ Private Functions ============ /** * @notice Call the initialization function on the implementation * Used at deployment to initialize the proxy * based on the logic for initialization defined at the implementation * @param _implementation - Contract to which the initalization is delegated * @param _initializationCalldata - Calldata supplied when calling the initialization function */ function _initialize( address _implementation, bytes memory _initializationCalldata ) private { // Delegatecall into the implementation, supplying initialization calldata. (bool _ok, ) = _implementation.delegatecall(_initializationCalldata); // Revert and include revert data if delegatecall to implementation reverts. if (!_ok) { assembly { returndatacopy(0, 0, returndatasize()) revert(0, returndatasize()) } } } /** * @notice Delegates function calls to the implementation contract returned by the Upgrade Beacon */ function _fallback() private { _delegate(_getImplementation()); } /** * @notice Delegate function execution to the implementation contract * @dev This is a low level function that doesn't return to its internal * call site. It will return whatever is returned by the implementation to the * external caller, reverting and returning the revert data if implementation * reverts. * @param _implementation - Address to which the function execution is delegated */ function _delegate(address _implementation) private { assembly { // Copy msg.data. We take full control of memory in this inline assembly // block because it will not return to Solidity code. We overwrite the // Solidity scratch pad at memory position 0. calldatacopy(0, 0, calldatasize()) // Delegatecall to the implementation, supplying calldata and gas. // Out and outsize are set to zero - instead, use the return buffer. let result := delegatecall( gas(), _implementation, 0, calldatasize(), 0, 0 ) // Copy the returned data from the return buffer. returndatacopy(0, 0, returndatasize()) switch result // Delegatecall returns 0 on error. case 0 { revert(0, returndatasize()) } default { return(0, returndatasize()) } } } /** * @notice Call the Upgrade Beacon to get the current implementation contract address * @return _implementation Address of the current implementation. */ function _getImplementation() private view returns (address _implementation) { _implementation = _getImplementation(upgradeBeacon); } /** * @notice Call the Upgrade Beacon to get the current implementation contract address * @dev _upgradeBeacon is passed as a parameter so that * we can also use this function in the constructor, * where we can't access immutable variables. * @param _upgradeBeacon Address of the UpgradeBeacon storing the current implementation * @return _implementation Address of the current implementation. */ function _getImplementation(address _upgradeBeacon) private view returns (address _implementation) { // Get the current implementation address from the upgrade beacon. (bool _ok, bytes memory _returnData) = _upgradeBeacon.staticcall(""); // Revert and pass along revert message if call to upgrade beacon reverts. require(_ok, string(_returnData)); // Set the implementation to the address returned from the upgrade beacon. _implementation = abi.decode(_returnData, (address)); } }
/@openzeppelin/contracts/utils/Address.sol
// SPDX-License-Identifier: MIT pragma solidity >=0.6.2 <0.8.0; /** * @dev Collection of functions related to the address type */ library Address { /** * @dev Returns true if `account` is a contract. * * [IMPORTANT] * ==== * It is unsafe to assume that an address for which this function returns * false is an externally-owned account (EOA) and not a contract. * * Among others, `isContract` will return false for the following * types of addresses: * * - an externally-owned account * - a contract in construction * - an address where a contract will be created * - an address where a contract lived, but was destroyed * ==== */ function isContract(address account) internal view returns (bool) { // This method relies on extcodesize, which returns 0 for contracts in // construction, since the code is only stored at the end of the // constructor execution. uint256 size; // solhint-disable-next-line no-inline-assembly assembly { size := extcodesize(account) } return size > 0; } /** * @dev Replacement for Solidity's `transfer`: sends `amount` wei to * `recipient`, forwarding all available gas and reverting on errors. * * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost * of certain opcodes, possibly making contracts go over the 2300 gas limit * imposed by `transfer`, making them unable to receive funds via * `transfer`. {sendValue} removes this limitation. * * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more]. * * IMPORTANT: because control is transferred to `recipient`, care must be * taken to not create reentrancy vulnerabilities. Consider using * {ReentrancyGuard} or the * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern]. */ function sendValue(address payable recipient, uint256 amount) internal { require(address(this).balance >= amount, "Address: insufficient balance"); // solhint-disable-next-line avoid-low-level-calls, avoid-call-value (bool success, ) = recipient.call{ value: amount }(""); require(success, "Address: unable to send value, recipient may have reverted"); } /** * @dev Performs a Solidity function call using a low level `call`. A * plain`call` is an unsafe replacement for a function call: use this * function instead. * * If `target` reverts with a revert reason, it is bubbled up by this * function (like regular Solidity function calls). * * Returns the raw returned data. To convert to the expected return value, * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`]. * * Requirements: * * - `target` must be a contract. * - calling `target` with `data` must not revert. * * _Available since v3.1._ */ function functionCall(address target, bytes memory data) internal returns (bytes memory) { return functionCall(target, data, "Address: low-level call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with * `errorMessage` as a fallback revert reason when `target` reverts. * * _Available since v3.1._ */ function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) { return functionCallWithValue(target, data, 0, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but also transferring `value` wei to `target`. * * Requirements: * * - the calling contract must have an ETH balance of at least `value`. * - the called Solidity function must be `payable`. * * _Available since v3.1._ */ function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) { return functionCallWithValue(target, data, value, "Address: low-level call with value failed"); } /** * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but * with `errorMessage` as a fallback revert reason when `target` reverts. * * _Available since v3.1._ */ function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) { require(address(this).balance >= value, "Address: insufficient balance for call"); require(isContract(target), "Address: call to non-contract"); // solhint-disable-next-line avoid-low-level-calls (bool success, bytes memory returndata) = target.call{ value: value }(data); return _verifyCallResult(success, returndata, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but performing a static call. * * _Available since v3.3._ */ function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) { return functionStaticCall(target, data, "Address: low-level static call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`], * but performing a static call. * * _Available since v3.3._ */ function functionStaticCall(address target, bytes memory data, string memory errorMessage) internal view returns (bytes memory) { require(isContract(target), "Address: static call to non-contract"); // solhint-disable-next-line avoid-low-level-calls (bool success, bytes memory returndata) = target.staticcall(data); return _verifyCallResult(success, returndata, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but performing a delegate call. * * _Available since v3.4._ */ function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) { return functionDelegateCall(target, data, "Address: low-level delegate call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`], * but performing a delegate call. * * _Available since v3.4._ */ function functionDelegateCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) { require(isContract(target), "Address: delegate call to non-contract"); // solhint-disable-next-line avoid-low-level-calls (bool success, bytes memory returndata) = target.delegatecall(data); return _verifyCallResult(success, returndata, errorMessage); } function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private pure returns(bytes memory) { if (success) { return returndata; } else { // Look for revert reason and bubble it up if present if (returndata.length > 0) { // The easiest way to bubble the revert reason is using memory via assembly // solhint-disable-next-line no-inline-assembly assembly { let returndata_size := mload(returndata) revert(add(32, returndata), returndata_size) } } else { revert(errorMessage); } } } }
Compiler Settings
{"remappings":[],"optimizer":{"runs":999999,"enabled":true},"metadata":{"bytecodeHash":"ipfs"},"libraries":{},"evmVersion":"istanbul","compilationTarget":{"@celo-org/optics-sol/contracts/upgrade/UpgradeBeaconProxy.sol":"UpgradeBeaconProxy"}}
Contract ABI
[{"type":"constructor","stateMutability":"payable","inputs":[{"type":"address","name":"_upgradeBeacon","internalType":"address"},{"type":"bytes","name":"_initializationCalldata","internalType":"bytes"}]},{"type":"fallback","stateMutability":"payable"},{"type":"receive","stateMutability":"payable"}]
Contract Creation Code
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Deployed ByteCode
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