Contract Address Details

0x2bDc5CcdA08A7F821ae0Df72B5Fda60Cd58d6353

Contract Name
censusworks.0
Creator
0x743d80–035b13 at 0x1766f3–a046bf
Implementation
0x511aa43abb122661ea071b0f96c59c326e243e2d
Balance
1 CELO
Tokens
Fetching tokens...
Transactions
Transfers
Gas Used
Last Balance Update
9323749
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
0x60806040526004361061004a5760003560e01c806303386ba3146101e757806342404e0714610280578063bb913f41146102d7578063d29d44ee14610328578063f7e6af8014610379575b6000600160405180807f656970313936372e70726f78792e696d706c656d656e746174696f6e00000000815250601c019050604051809103902060001c0360001b9050600081549050600073ffffffffffffffffffffffffffffffffffffffff168173ffffffffffffffffffffffffffffffffffffffff161415610136576040517f08c379a00000000000000000000000000000000000000000000000000000000081526004018080602001828103825260158152602001807f4e6f20496d706c656d656e746174696f6e20736574000000000000000000000081525060200191505060405180910390fd5b61013f816103d0565b6101b1576040517f08c379a00000000000000000000000000000000000000000000000000000000081526004018080602001828103825260188152602001807f496e76616c696420636f6e74726163742061646472657373000000000000000081525060200191505060405180910390fd5b60405136810160405236600082376000803683855af43d604051818101604052816000823e82600081146101e3578282f35b8282fd5b61027e600480360360408110156101fd57600080fd5b81019080803573ffffffffffffffffffffffffffffffffffffffff1690602001909291908035906020019064010000000081111561023a57600080fd5b82018360208201111561024c57600080fd5b8035906020019184600183028401116401000000008311171561026e57600080fd5b909192939192939050505061041b565b005b34801561028c57600080fd5b506102956105c1565b604051808273ffffffffffffffffffffffffffffffffffffffff1673ffffffffffffffffffffffffffffffffffffffff16815260200191505060405180910390f35b3480156102e357600080fd5b50610326600480360360208110156102fa57600080fd5b81019080803573ffffffffffffffffffffffffffffffffffffffff16906020019092919050505061060d565b005b34801561033457600080fd5b506103776004803603602081101561034b57600080fd5b81019080803573ffffffffffffffffffffffffffffffffffffffff1690602001909291905050506107bd565b005b34801561038557600080fd5b5061038e610871565b604051808273ffffffffffffffffffffffffffffffffffffffff1673ffffffffffffffffffffffffffffffffffffffff16815260200191505060405180910390f35b60008060007fc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a47060001b9050833f915080821415801561041257506000801b8214155b92505050919050565b610423610871565b73ffffffffffffffffffffffffffffffffffffffff163373ffffffffffffffffffffffffffffffffffffffff16146104c3576040517f08c379a00000000000000000000000000000000000000000000000000000000081526004018080602001828103825260148152602001807f73656e64657220776173206e6f74206f776e657200000000000000000000000081525060200191505060405180910390fd5b6104cc8361060d565b600060608473ffffffffffffffffffffffffffffffffffffffff168484604051808383808284378083019250505092505050600060405180830381855af49150503d8060008114610539576040519150601f19603f3d011682016040523d82523d6000602084013e61053e565b606091505b508092508193505050816105ba576040517f08c379a000000000000000000000000000000000000000000000000000000000815260040180806020018281038252601e8152602001807f696e697469616c697a6174696f6e2063616c6c6261636b206661696c6564000081525060200191505060405180910390fd5b5050505050565b600080600160405180807f656970313936372e70726f78792e696d706c656d656e746174696f6e00000000815250601c019050604051809103902060001c0360001b9050805491505090565b610615610871565b73ffffffffffffffffffffffffffffffffffffffff163373ffffffffffffffffffffffffffffffffffffffff16146106b5576040517f08c379a00000000000000000000000000000000000000000000000000000000081526004018080602001828103825260148152602001807f73656e64657220776173206e6f74206f776e657200000000000000000000000081525060200191505060405180910390fd5b6000600160405180807f656970313936372e70726f78792e696d706c656d656e746174696f6e00000000815250601c019050604051809103902060001c0360001b9050610701826103d0565b610773576040517f08c379a00000000000000000000000000000000000000000000000000000000081526004018080602001828103825260188152602001807f496e76616c696420636f6e74726163742061646472657373000000000000000081525060200191505060405180910390fd5b8181558173ffffffffffffffffffffffffffffffffffffffff167fab64f92ab780ecbf4f3866f57cee465ff36c89450dcce20237ca7a8d81fb7d1360405160405180910390a25050565b6107c5610871565b73ffffffffffffffffffffffffffffffffffffffff163373ffffffffffffffffffffffffffffffffffffffff1614610865576040517f08c379a00000000000000000000000000000000000000000000000000000000081526004018080602001828103825260148152602001807f73656e64657220776173206e6f74206f776e657200000000000000000000000081525060200191505060405180910390fd5b61086e816108bd565b50565b600080600160405180807f656970313936372e70726f78792e61646d696e000000000000000000000000008152506013019050604051809103902060001c0360001b9050805491505090565b600073ffffffffffffffffffffffffffffffffffffffff168173ffffffffffffffffffffffffffffffffffffffff161415610960576040517f08c379a00000000000000000000000000000000000000000000000000000000081526004018080602001828103825260118152602001807f6f776e65722063616e6e6f74206265203000000000000000000000000000000081525060200191505060405180910390fd5b6000600160405180807f656970313936372e70726f78792e61646d696e000000000000000000000000008152506013019050604051809103902060001c0360001b90508181558173ffffffffffffffffffffffffffffffffffffffff167f50146d0e3c60aa1d17a70635b05494f864e86144a2201275021014fbf08bafe260405160405180910390a2505056fea165627a7a72305820b862497decc842ed6b2cf9c83b03f37ae84f22688fd3d3c38b832781ecde44c60029