xDAI Price: $1.00 (-0.01%)
Gas: 1.1 GWei

Contract

0x22C1f6050E56d2876009903609a2cC3fEf83B415

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0xb208907f2dfb8a721010e0eb462d4cdb2b2b6c7b907a1b7dac335c3740fa8f05 -(pending)2025-01-14 22:51:583 secs ago1736895118IN
The Proof of Attendance Protocol: POAP Token
0 xDAI(Pending)(Pending)
Freeze380443732025-01-14 22:51:4021 secs ago1736895100IN
The Proof of Attendance Protocol: POAP Token
0 xDAI0.000067931
Mint Token380443712025-01-14 22:51:3031 secs ago1736895090IN
The Proof of Attendance Protocol: POAP Token
0 xDAI0.000191831
Burn380443682025-01-14 22:51:1546 secs ago1736895075IN
The Proof of Attendance Protocol: POAP Token
0 xDAI0.000074231
Freeze380443632025-01-14 22:50:501 min ago1736895050IN
The Proof of Attendance Protocol: POAP Token
0 xDAI0.000067931
Mint Token380443612025-01-14 22:50:401 min ago1736895040IN
The Proof of Attendance Protocol: POAP Token
0 xDAI0.000191831
Burn380443552025-01-14 22:50:051 min ago1736895005IN
The Proof of Attendance Protocol: POAP Token
0 xDAI0.000074231
Freeze380443512025-01-14 22:49:452 mins ago1736894985IN
The Proof of Attendance Protocol: POAP Token
0 xDAI0.000067931
Mint Token380443492025-01-14 22:49:352 mins ago1736894975IN
The Proof of Attendance Protocol: POAP Token
0 xDAI0.000191831
Burn380443202025-01-14 22:47:104 mins ago1736894830IN
The Proof of Attendance Protocol: POAP Token
0 xDAI0.000074231.00000001
Freeze380443162025-01-14 22:46:505 mins ago1736894810IN
The Proof of Attendance Protocol: POAP Token
0 xDAI0.000067931.00000001
Mint Token380443142025-01-14 22:46:405 mins ago1736894800IN
The Proof of Attendance Protocol: POAP Token
0 xDAI0.000191831.00000001
Burn380442832025-01-14 22:44:008 mins ago1736894640IN
The Proof of Attendance Protocol: POAP Token
0 xDAI0.000074231
Burn380442822025-01-14 22:43:558 mins ago1736894635IN
The Proof of Attendance Protocol: POAP Token
0 xDAI0.000074231.00000001
Burn380442812025-01-14 22:43:508 mins ago1736894630IN
The Proof of Attendance Protocol: POAP Token
0 xDAI0.000082071.00000001
Burn380442812025-01-14 22:43:508 mins ago1736894630IN
The Proof of Attendance Protocol: POAP Token
0 xDAI0.000082071.00000001
Burn380442802025-01-14 22:43:458 mins ago1736894625IN
The Proof of Attendance Protocol: POAP Token
0 xDAI0.000082071.00000001
Freeze380442792025-01-14 22:43:408 mins ago1736894620IN
The Proof of Attendance Protocol: POAP Token
0 xDAI0.000067931.00000001
Burn380442792025-01-14 22:43:408 mins ago1736894620IN
The Proof of Attendance Protocol: POAP Token
0 xDAI0.000082071.00000001
Burn380442792025-01-14 22:43:408 mins ago1736894620IN
The Proof of Attendance Protocol: POAP Token
0 xDAI0.000082071.00000001
Burn380442792025-01-14 22:43:408 mins ago1736894620IN
The Proof of Attendance Protocol: POAP Token
0 xDAI0.000082071.00000001
Mint Token380442762025-01-14 22:43:258 mins ago1736894605IN
The Proof of Attendance Protocol: POAP Token
0 xDAI0.000191831
Freeze380442752025-01-14 22:43:208 mins ago1736894600IN
The Proof of Attendance Protocol: POAP Token
0 xDAI0.000067931
Freeze380442742025-01-14 22:43:158 mins ago1736894595IN
The Proof of Attendance Protocol: POAP Token
0 xDAI0.000067931
Mint Token380442732025-01-14 22:43:108 mins ago1736894590IN
The Proof of Attendance Protocol: POAP Token
0 xDAI0.000191831
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Contract Source Code Verified (Exact Match)

Contract Name:
AdminUpgradeabilityProxy

Compiler Version
v0.5.2+commit.1df8f40c

Optimization Enabled:
No with 200 runs

Other Settings:
default evmVersion, None license
/**
 *Submitted for verification at gnosisscan.io on 2022-08-24
*/

pragma solidity ^0.5.0;

/**
 * Utility library of inline functions on addresses
 *
 * Source https://raw.githubusercontent.com/OpenZeppelin/openzeppelin-solidity/v2.1.3/contracts/utils/Address.sol
 * This contract is copied here and renamed from the original to avoid clashes in the compiled artifacts
 * when the user imports a zos-lib contract (that transitively causes this contract to be compiled and added to the
 * build/artifacts folder) as well as the vanilla Address implementation from an openzeppelin version.
 */
library ZOSLibAddress {
    /**
     * Returns whether the target address is a contract
     * @dev This function will return false if invoked during the constructor of a contract,
     * as the code is not actually created until after the constructor finishes.
     * @param account address of the account to check
     * @return whether the target address is a contract
     */
    function isContract(address account) internal view returns (bool) {
        uint256 size;
        // XXX Currently there is no better way to check if there is a contract in an address
        // than to check the size of the code at that address.
        // See https://ethereum.stackexchange.com/a/14016/36603
        // for more details about how this works.
        // TODO Check this again before the Serenity release, because all addresses will be
        // contracts then.
        // solhint-disable-next-line no-inline-assembly
        assembly { size := extcodesize(account) }
        return size > 0;
    }
}          
          

/**
 * @title Proxy
 * @dev Implements delegation of calls to other contracts, with proper
 * forwarding of return values and bubbling of failures.
 * It defines a fallback function that delegates all calls to the address
 * returned by the abstract _implementation() internal function.
 */
contract Proxy {
  /**
   * @dev Fallback function.
   * Implemented entirely in `_fallback`.
   */
  function () payable external {
    _fallback();
  }

  /**
   * @return The Address of the implementation.
   */
  function _implementation() internal view returns (address);

  /**
   * @dev Delegates execution to an implementation contract.
   * This is a low level function that doesn't return to its internal call site.
   * It will return to the external caller whatever the implementation returns.
   * @param implementation Address to delegate.
   */
  function _delegate(address implementation) internal {
    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)

      // Call the implementation.
      // out and outsize are 0 because we don't know the size yet.
      let result := delegatecall(gas, implementation, 0, calldatasize, 0, 0)

      // Copy the returned data.
      returndatacopy(0, 0, returndatasize)

      switch result
      // delegatecall returns 0 on error.
      case 0 { revert(0, returndatasize) }
      default { return(0, returndatasize) }
    }
  }

  /**
   * @dev Function that is run as the first thing in the fallback function.
   * Can be redefined in derived contracts to add functionality.
   * Redefinitions must call super._willFallback().
   */
  function _willFallback() internal {
  }

  /**
   * @dev fallback implementation.
   * Extracted to enable manual triggering.
   */
  function _fallback() internal {
    _willFallback();
    _delegate(_implementation());
  }
}
          

/**
 * @title BaseUpgradeabilityProxy
 * @dev This contract implements a proxy that allows to change the
 * implementation address to which it will delegate.
 * Such a change is called an implementation upgrade.
 */
contract BaseUpgradeabilityProxy is Proxy {
  /**
   * @dev Emitted when the implementation is upgraded.
   * @param implementation Address of the new implementation.
   */
  event Upgraded(address indexed implementation);

  /**
   * @dev Storage slot with the address of the current implementation.
   * This is the keccak-256 hash of "org.zeppelinos.proxy.implementation", and is
   * validated in the constructor.
   */
  bytes32 internal constant IMPLEMENTATION_SLOT = 0x7050c9e0f4ca769c69bd3a8ef740bc37934f8e2c036e5a723fd8ee048ed3f8c3;

  /**
   * @dev Returns the current implementation.
   * @return Address of the current implementation
   */
  function _implementation() internal view returns (address impl) {
    bytes32 slot = IMPLEMENTATION_SLOT;
    assembly {
      impl := sload(slot)
    }
  }

  /**
   * @dev Upgrades the proxy to a new implementation.
   * @param newImplementation Address of the new implementation.
   */
  function _upgradeTo(address newImplementation) internal {
    _setImplementation(newImplementation);
    emit Upgraded(newImplementation);
  }

  /**
   * @dev Sets the implementation address of the proxy.
   * @param newImplementation Address of the new implementation.
   */
  function _setImplementation(address newImplementation) internal {
    require(ZOSLibAddress.isContract(newImplementation), "Cannot set a proxy implementation to a non-contract address");

    bytes32 slot = IMPLEMENTATION_SLOT;

    assembly {
      sstore(slot, newImplementation)
    }
  }
}
          

/**
 * @title BaseAdminUpgradeabilityProxy
 * @dev This contract combines an upgradeability proxy with an authorization
 * mechanism for administrative tasks.
 * All external functions in this contract must be guarded by the
 * `ifAdmin` modifier. See ethereum/solidity#3864 for a Solidity
 * feature proposal that would enable this to be done automatically.
 */
contract BaseAdminUpgradeabilityProxy is BaseUpgradeabilityProxy {
  /**
   * @dev Emitted when the administration has been transferred.
   * @param previousAdmin Address of the previous admin.
   * @param newAdmin Address of the new admin.
   */
  event AdminChanged(address previousAdmin, address newAdmin);

  /**
   * @dev Storage slot with the admin of the contract.
   * This is the keccak-256 hash of "org.zeppelinos.proxy.admin", and is
   * validated in the constructor.
   */
  bytes32 internal constant ADMIN_SLOT = 0x10d6a54a4754c8869d6886b5f5d7fbfa5b4522237ea5c60d11bc4e7a1ff9390b;

  /**
   * @dev Modifier to check whether the `msg.sender` is the admin.
   * If it is, it will run the function. Otherwise, it will delegate the call
   * to the implementation.
   */
  modifier ifAdmin() {
    if (msg.sender == _admin()) {
      _;
    } else {
      _fallback();
    }
  }

  /**
   * @return The address of the proxy admin.
   */
  function admin() external ifAdmin returns (address) {
    return _admin();
  }

  /**
   * @return The address of the implementation.
   */
  function implementation() external ifAdmin returns (address) {
    return _implementation();
  }

  /**
   * @dev Changes the admin of the proxy.
   * Only the current admin can call this function.
   * @param newAdmin Address to transfer proxy administration to.
   */
  function changeAdmin(address newAdmin) external ifAdmin {
    require(newAdmin != address(0), "Cannot change the admin of a proxy to the zero address");
    emit AdminChanged(_admin(), newAdmin);
    _setAdmin(newAdmin);
  }

  /**
   * @dev Upgrade the backing implementation of the proxy.
   * Only the admin can call this function.
   * @param newImplementation Address of the new implementation.
   */
  function upgradeTo(address newImplementation) external ifAdmin {
    _upgradeTo(newImplementation);
  }

  /**
   * @dev Upgrade the backing implementation of the proxy and call a function
   * on the new implementation.
   * This is useful to initialize the proxied contract.
   * @param newImplementation Address of the new implementation.
   * @param data Data to send as msg.data in the low level call.
   * It should include the signature and the parameters of the function to be called, as described in
   * https://solidity.readthedocs.io/en/v0.4.24/abi-spec.html#function-selector-and-argument-encoding.
   */
  function upgradeToAndCall(address newImplementation, bytes calldata data) payable external ifAdmin {
    _upgradeTo(newImplementation);
    (bool success,) = newImplementation.delegatecall(data);
    require(success);
  }

  /**
   * @return The admin slot.
   */
  function _admin() internal view returns (address adm) {
    bytes32 slot = ADMIN_SLOT;
    assembly {
      adm := sload(slot)
    }
  }

  /**
   * @dev Sets the address of the proxy admin.
   * @param newAdmin Address of the new proxy admin.
   */
  function _setAdmin(address newAdmin) internal {
    bytes32 slot = ADMIN_SLOT;

    assembly {
      sstore(slot, newAdmin)
    }
  }

  /**
   * @dev Only fall back when the sender is not the admin.
   */
  function _willFallback() internal {
    require(msg.sender != _admin(), "Cannot call fallback function from the proxy admin");
    super._willFallback();
  }
}

/**
 * @title UpgradeabilityProxy
 * @dev Extends BaseUpgradeabilityProxy with a constructor for initializing
 * implementation and init data.
 */
contract UpgradeabilityProxy is BaseUpgradeabilityProxy {
  /**
   * @dev Contract constructor.
   * @param _logic Address of the initial implementation.
   * @param _data Data to send as msg.data to the implementation to initialize the proxied contract.
   * It should include the signature and the parameters of the function to be called, as described in
   * https://solidity.readthedocs.io/en/v0.4.24/abi-spec.html#function-selector-and-argument-encoding.
   * This parameter is optional, if no data is given the initialization call to proxied contract will be skipped.
   */
  constructor(address _logic, bytes memory _data) public payable {
    assert(IMPLEMENTATION_SLOT == keccak256("org.zeppelinos.proxy.implementation"));
    _setImplementation(_logic);
    if(_data.length > 0) {
      (bool success,) = _logic.delegatecall(_data);
      require(success);
    }
  }  
}   

/**
 * @title AdminUpgradeabilityProxy
 * @dev Extends from BaseAdminUpgradeabilityProxy with a constructor for 
 * initializing the implementation, admin, and init data.
 */
contract AdminUpgradeabilityProxy is BaseAdminUpgradeabilityProxy, UpgradeabilityProxy {
  /**
   * Contract constructor.
   * @param _logic address of the initial implementation.
   * @param _admin Address of the proxy administrator.
   * @param _data Data to send as msg.data to the implementation to initialize the proxied contract.
   * It should include the signature and the parameters of the function to be called, as described in
   * https://solidity.readthedocs.io/en/v0.4.24/abi-spec.html#function-selector-and-argument-encoding.
   * This parameter is optional, if no data is given the initialization call to proxied contract will be skipped.
   */
  constructor(address _logic, address _admin, bytes memory _data) UpgradeabilityProxy(_logic, _data) public payable {
    assert(ADMIN_SLOT == keccak256("org.zeppelinos.proxy.admin"));
    _setAdmin(_admin);
  }
}

Contract Security Audit

Contract ABI

[{"constant":false,"inputs":[{"name":"newImplementation","type":"address"}],"name":"upgradeTo","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"newImplementation","type":"address"},{"name":"data","type":"bytes"}],"name":"upgradeToAndCall","outputs":[],"payable":true,"stateMutability":"payable","type":"function"},{"constant":false,"inputs":[],"name":"implementation","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"newAdmin","type":"address"}],"name":"changeAdmin","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[],"name":"admin","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"inputs":[{"name":"_logic","type":"address"},{"name":"_admin","type":"address"},{"name":"_data","type":"bytes"}],"payable":true,"stateMutability":"payable","type":"constructor"},{"payable":true,"stateMutability":"payable","type":"fallback"},{"anonymous":false,"inputs":[{"indexed":false,"name":"previousAdmin","type":"address"},{"indexed":false,"name":"newAdmin","type":"address"}],"name":"AdminChanged","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"implementation","type":"address"}],"name":"Upgraded","type":"event"}]

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Deployed Bytecode

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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)

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

-----Decoded View---------------
Arg [0] : _logic (address): 0x0211621fB78c85EE44b12D2F04e2e2f16334a9fE
Arg [1] : _admin (address): 0xDD3C426fA842F890BCb793DA6ccD749Edb09c44B
Arg [2] : _data (bytes): 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

-----Encoded View---------------
16 Constructor Arguments found :
Arg [0] : 0000000000000000000000000211621fb78c85ee44b12d2f04e2e2f16334a9fe
Arg [1] : 000000000000000000000000dd3c426fa842f890bcb793da6ccd749edb09c44b
Arg [2] : 0000000000000000000000000000000000000000000000000000000000000060
Arg [3] : 0000000000000000000000000000000000000000000000000000000000000164
Arg [4] : 8d23209400000000000000000000000000000000000000000000000000000000
Arg [5] : 0000008000000000000000000000000000000000000000000000000000000000
Arg [6] : 000000c000000000000000000000000000000000000000000000000000000000
Arg [7] : 0000010000000000000000000000000000000000000000000000000000000000
Arg [8] : 0000014000000000000000000000000000000000000000000000000000000000
Arg [9] : 00000004504f4150000000000000000000000000000000000000000000000000
Arg [10] : 0000000000000000000000000000000000000000000000000000000000000000
Arg [11] : 000000205468652050726f6f66206f6620417474656e64616e63652050726f74
Arg [12] : 6f636f6c00000000000000000000000000000000000000000000000000000000
Arg [13] : 0000001e68747470733a2f2f6170692e706f61702e78797a2f6d657461646174
Arg [14] : 612f000000000000000000000000000000000000000000000000000000000000
Arg [15] : 0000000000000000000000000000000000000000000000000000000000000000


Deployed Bytecode Sourcemap

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Swarm Source

bzzr://b6f16038090c753f0c6f1b3c6169e6efd0704d91ba6bb106c29b5fbd8aa554d7

Block Transaction Gas Used Reward
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Block Uncle Number Difficulty Gas Used Reward
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OVERVIEW

POAPs are digital mementos, minted in celebration of life's remarkable moments. Each POAP is a gift from an issuer to collectors, in celebration of a special shared memory.

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Validator Index Block Amount
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Transaction Hash Block Value Eth2 PubKey Valid
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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.