Contract Address Details

0x43720c8Db4c2E4cA7fa4f5709Af36988BC1482Ec

Creator
0x8d4857–529127 at 0x3eacec–2558c5
Implementation
0xce2c309fcdd077139927485b17190020252ffe8d
Balance
8.681161946000000009 CELO
Tokens
Fetching tokens...
Transactions
Transfers
Gas Used
Last Balance Update
10129563
Contract is not verified. However, we found a verified contract with the same bytecode in Blockscout DB 0x7c75b0b81a54359e9dccda9cb663ca2e3de6b710.
All metadata displayed below is from that contract. In order to verify current contract, click Verify & Publish button
Contract name:
Proxy




Optimization enabled
false
Compiler version
v0.5.13+commit.5b0b510c




Verified at
2021-08-21 00:08:30.393197Z

Contract source code

pragma solidity ^0.5.13;
/* solhint-disable no-inline-assembly, no-complex-fallback, avoid-low-level-calls */
import "openzeppelin-solidity/contracts/utils/Address.sol";
/**
* @title A Proxy utilizing the Unstructured Storage pattern.
*/
contract Proxy {
// Used to store the address of the owner.
bytes32 private constant OWNER_POSITION = bytes32(uint256(keccak256("eip1967.proxy.admin")) - 1);
// Used to store the address of the implementation contract.
bytes32 private constant IMPLEMENTATION_POSITION = bytes32(
uint256(keccak256("eip1967.proxy.implementation")) - 1
);
event OwnerSet(address indexed owner);
event ImplementationSet(address indexed implementation);
constructor() public {
_setOwner(msg.sender);
}
/**
* @notice Throws if called by any account other than the owner.
*/
modifier onlyOwner() {
require(msg.sender == _getOwner(), "sender was not owner");
_;
}
/**
* @notice Delegates calls to the implementation contract.
*/
function() external payable {
bytes32 implementationPosition = IMPLEMENTATION_POSITION;
address implementationAddress;
// Load the address of the implementation contract from an explicit storage slot.
assembly {
implementationAddress := sload(implementationPosition)
}
// Avoid checking if address is a contract or executing delegated call when
// implementation address is 0x0
require(implementationAddress != address(0), "No Implementation set");
require(Address.isContract(implementationAddress), "Invalid contract address");
assembly {
// Extract the position of the transaction data (i.e. function ID and arguments).
let newCallDataPosition := mload(0x40)
mstore(0x40, add(newCallDataPosition, calldatasize))
calldatacopy(newCallDataPosition, 0, calldatasize)
// Call the smart contract at `implementationAddress` in the context of the proxy contract,
// with the same msg.sender and value.
let delegatecallSuccess := delegatecall(
gas,
implementationAddress,
newCallDataPosition,
calldatasize,
0,
0
)
// Copy the return value of the call so it can be returned.
let returnDataSize := returndatasize
let returnDataPosition := mload(0x40)
mstore(0x40, add(returnDataPosition, returnDataSize))
returndatacopy(returnDataPosition, 0, returnDataSize)
// Revert or return depending on whether or not the call was successful.
switch delegatecallSuccess
case 0 {
revert(returnDataPosition, returnDataSize)
}
default {
return(returnDataPosition, returnDataSize)
}
}
}
/**
* @notice Transfers ownership of Proxy to a new owner.
* @param newOwner Address of the new owner account.
*/
function _transferOwnership(address newOwner) external onlyOwner {
_setOwner(newOwner);
}
/**
* @notice Sets the address of the implementation contract and calls into it.
* @param implementation Address of the new target contract.
* @param callbackData The abi-encoded function call to perform in the implementation
* contract.
* @dev Throws if the initialization callback fails.
* @dev If the target contract does not need initialization, use
* setImplementation instead.
*/
function _setAndInitializeImplementation(address implementation, bytes calldata callbackData)
external
payable
onlyOwner
{
_setImplementation(implementation);
bool success;
bytes memory returnValue;
(success, returnValue) = implementation.delegatecall(callbackData);
require(success, "initialization callback failed");
}
/**
* @notice Returns the implementation address.
*/
function _getImplementation() external view returns (address implementation) {
bytes32 implementationPosition = IMPLEMENTATION_POSITION;
// Load the address of the implementation contract from an explicit storage slot.
assembly {
implementation := sload(implementationPosition)
}
}
/**
* @notice Sets the address of the implementation contract.
* @param implementation Address of the new target contract.
* @dev If the target contract needs to be initialized, call
* setAndInitializeImplementation instead.
*/
function _setImplementation(address implementation) public onlyOwner {
bytes32 implementationPosition = IMPLEMENTATION_POSITION;
require(Address.isContract(implementation), "Invalid contract address");
// Store the address of the implementation contract in an explicit storage slot.
assembly {
sstore(implementationPosition, implementation)
}
emit ImplementationSet(implementation);
}
/**
* @notice Returns the Proxy owner's address.
*/
function _getOwner() public view returns (address owner) {
bytes32 position = OWNER_POSITION;
// Load the address of the contract owner from an explicit storage slot.
assembly {
owner := sload(position)
}
}
function _setOwner(address newOwner) private {
require(newOwner != address(0), "owner cannot be 0");
bytes32 position = OWNER_POSITION;
// Store the address of the contract owner in an explicit storage slot.
assembly {
sstore(position, newOwner)
}
emit OwnerSet(newOwner);
}
}

Address.sol

pragma solidity ^0.5.5;
/**
* @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) {
// According to EIP-1052, 0x0 is the value returned for not-yet created accounts
// and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned
// for accounts without code, i.e. `keccak256('')`
bytes32 codehash;
bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;
// solhint-disable-next-line no-inline-assembly
assembly { codehash := extcodehash(account) }
return (codehash != accountHash && codehash != 0x0);
}
/**
* @dev Converts an `address` into `address payable`. Note that this is
* simply a type cast: the actual underlying value is not changed.
*
* _Available since v2.4.0._
*/
function toPayable(address account) internal pure returns (address payable) {
return address(uint160(account));
}
/**
* @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].
*
* _Available since v2.4.0._
*/
function sendValue(address payable recipient, uint256 amount) internal {
require(address(this).balance >= amount, "Address: insufficient balance");
// solhint-disable-next-line avoid-call-value
(bool success, ) = recipient.call.value(amount)("");
require(success, "Address: unable to send value, recipient may have reverted");
}
}

Contract ABI

[{"type":"constructor","stateMutability":"nonpayable","payable":false,"inputs":[]},{"type":"event","name":"ImplementationSet","inputs":[{"type":"address","name":"implementation","internalType":"address","indexed":true}],"anonymous":false},{"type":"event","name":"OwnerSet","inputs":[{"type":"address","name":"owner","internalType":"address","indexed":true}],"anonymous":false},{"type":"fallback","stateMutability":"payable","payable":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"address","name":"implementation","internalType":"address"}],"name":"_getImplementation","inputs":[],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"address","name":"owner","internalType":"address"}],"name":"_getOwner","inputs":[],"constant":true},{"type":"function","stateMutability":"payable","payable":true,"outputs":[],"name":"_setAndInitializeImplementation","inputs":[{"type":"address","name":"implementation","internalType":"address"},{"type":"bytes","name":"callbackData","internalType":"bytes"}],"constant":false},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"_setImplementation","inputs":[{"type":"address","name":"implementation","internalType":"address"}],"constant":false},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"_transferOwnership","inputs":[{"type":"address","name":"newOwner","internalType":"address"}],"constant":false}]
            

Deployed ByteCode

Verify & Publish
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