Contract 0x5d22045DAcEAB03B158031eCB7D9d06Fad24609b

 

Contract Overview

DeversiFi 2
Balance:
1,847.60916141 Ether

EtherValue:
$2,854,999.58 (@ $1,545.24/ETH)

Token:
Txn Hash
Block
From
To
Value
0x0a1328afd473e542e4ab46a2ff89b8581a5ba550eb42d5e4f752ee98351208a9(pending)2021-03-02 0:48:1931 mins ago0xcc39ad64058d0f1e7e930a8f63f5646f01884184 IN DeversiFi 20 Ether(Pending)(Pending)
0x9f6ecbb5eaa6c06deb9ac03df3821eebfe238f285625b7f96b99cd7bbd315909(pending)2021-03-01 11:30:0913 hrs 49 mins ago0x17970047511c38148534e71911224db282101969 IN DeversiFi 20 Ether(Pending)(Pending)
0x605ef117cb235f1a4c9d927b98b1849d39b1e8ee90d68070df57ec333dc84c11(pending)2021-03-01 7:41:1417 hrs 38 mins ago0x7185fbff199928cbae71990ecb3cc4a7be2ff00a IN DeversiFi 20 Ether(Pending)(Pending)
0xf784749bca3cfe2e36557ee6265733a2811ef12807b1bcd9a1d37a277072243f(pending)2021-02-28 18:19:301 day 7 hrs ago0x5234b2a38578f5f632ec7e231f7b44a7a6d1e9e9 IN DeversiFi 20 Ether(Pending)(Pending)
0x9549a79e8c5f706af8e9931ff89d4f224321fd01d0c4ccbc46803664e39a01f3119557292021-03-02 1:04:4614 mins agoDeversiFi IN  DeversiFi 20 Ether0.0089296461158.1
0x9efd64b3786e1e21627d4bc77fb6298c182d7ece465f4538d800595981011dd6119557262021-03-02 1:04:3314 mins agoDeversiFi IN  DeversiFi 20 Ether0.0107778351158.1
0x00538160960a0a9ab22257b1c599609daef24c290e7f3d86f72a797f9e34da87119556822021-03-02 0:54:3224 mins ago0x8a6c80aab6497e2db35817817b593b79d78f6ae5 IN  DeversiFi 20 Ether0.013878095121
0xe7f4df03f76bdd22090010a949b6a16b3c4055368efd7e0647149d318aaad0fd119551372021-03-01 22:50:132 hrs 29 mins ago0x446087a1439a10889ebc124abd2e2761370bc848 IN  DeversiFi 20 Ether0.00586364981.4
0xe446838590f8c1b978183728c02653116f26396a267ca4880ce4f22867cb8ec4119548922021-03-01 21:56:143 hrs 23 mins ago0x41bc7d0687e6cea57fa26da78379dfdc5627c56d IN  DeversiFi 21 Ether0.00721448104
0x305309c63603fd17c951ac6bb33bf56a2ac5450c71747f243a25cc8bbdc32aa7119548722021-03-01 21:52:463 hrs 26 mins ago0x41bc7d0687e6cea57fa26da78379dfdc5627c56d IN  DeversiFi 20 Ether0.007489144104
0xe090ef07f1f3b093a3b68ffb7dd281b55672daa134b638f440a0084deabfcf32119547642021-03-01 21:25:473 hrs 53 mins ago0x276a05a2ed4637cbd1fd4994f6bd0539e4e7031d IN  DeversiFi 20 Ether0.019541025105
0xcc71a35cb729cb81c03440b586f94f5a0833e236ee3166ca4965c55a51538dec119547602021-03-01 21:24:223 hrs 55 mins ago0x276a05a2ed4637cbd1fd4994f6bd0539e4e7031d IN  DeversiFi 21 Ether0.00728385105
0xc2bba1bcd9cee696a5ea54a48c8773527b4deb50ca4ab21fb4446a9041e5bf83119547042021-03-01 21:13:444 hrs 5 mins ago0xa5bc1e077ea0a0d111840a32cc8bf33db3dafbec IN  DeversiFi 20 Ether0.0025485390
0xd6e9107f4abc37fee4e5670ea972a02dc953c0541f6c43e40ed7ad5663d88b8c119547042021-03-01 21:13:444 hrs 5 mins ago0xa5bc1e077ea0a0d111840a32cc8bf33db3dafbec IN  DeversiFi 20 Ether0.0025474590
0x1fa461842df331c72769e718fa866d5a444a7277f5c35364a9b4f62893755074119547042021-03-01 21:13:444 hrs 5 mins ago0xa5bc1e077ea0a0d111840a32cc8bf33db3dafbec IN  DeversiFi 20 Ether0.0025485390
0x133de2ba48ad5c5bddcd0d6fde96099f908615feb1600cce279d8b6027ddcea3119547042021-03-01 21:13:444 hrs 5 mins ago0xa5bc1e077ea0a0d111840a32cc8bf33db3dafbec IN  DeversiFi 20 Ether0.0025452990
0x4ec321ceeb8d59d0c0b70cf88fa708cc49feb0ae384ab88a4562261f73c42655119547042021-03-01 21:13:444 hrs 5 mins ago0xa5bc1e077ea0a0d111840a32cc8bf33db3dafbec IN  DeversiFi 20 Ether0.0025452990
0xc4da2ecb8a7ba2ff1f53a2eae0cb17139ec964c93a7b8d7e278981cd57d21e51119541092021-03-01 19:09:356 hrs 9 mins ago0xde07abf5663b88fbd0974ee69b3bc75971a29381 IN  DeversiFi 20 Ether0.009753597153
0x89a82b1ee95f6cb1492a552391baeb045d2541d67a4867e365252ff898288f3d119540392021-03-01 18:54:086 hrs 25 mins ago0x8fdec5ee435501571034a78a7f3aa167185969b3 IN  DeversiFi 20 Ether0.0122641290
0x6e7e3a2f2325f8e2a08105a61aff41a0e0c4efab2b88c5937a9d8888db1db6d6119540392021-03-01 18:54:086 hrs 25 mins ago0x8fdec5ee435501571034a78a7f3aa167185969b3 IN  DeversiFi 20 Ether0.0122641290
0x454df5587c91d8e432c03582ff1f4f029e22ea9dd4e3c6d15d5c0283ec325113119540392021-03-01 18:54:086 hrs 25 mins ago0x8fdec5ee435501571034a78a7f3aa167185969b3 IN  DeversiFi 20 Ether0.0122641290
0x5a8abbd86958c8d77730a983aa2e601103e39894e78ba3254d832b96fb737360119540392021-03-01 18:54:086 hrs 25 mins ago0x8fdec5ee435501571034a78a7f3aa167185969b3 IN  DeversiFi 20 Ether0.0122630490
0xa9cf379f9380934a3fb25a38f8c847f3f2da6684cecc9ce5bca0f285dbb80f99119540392021-03-01 18:54:086 hrs 25 mins ago0x8fdec5ee435501571034a78a7f3aa167185969b3 IN  DeversiFi 20 Ether0.0122641290
0xbd21b150aefa8365331a3577f44a36633c5b60fcc8264cd4dfe1627709689b8f119540362021-03-01 18:53:396 hrs 25 mins ago0x8fdec5ee435501571034a78a7f3aa167185969b3 IN  DeversiFi 20 Ether0.0122641290
0x59d8031a3a7a0401f3ade1de346d01a56c57a3fbcc961fb3ae70ca1f942a0ec6119540362021-03-01 18:53:396 hrs 25 mins ago0x8fdec5ee435501571034a78a7f3aa167185969b3 IN  DeversiFi 20 Ether0.0122641290
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0x6015d19b533b68f485f3be287fb27f8feeb239f21ada251e92920e48f7161c5d119518942021-03-01 10:50:0414 hrs 29 mins ago DeversiFi 20x977bcc40cd619cd57c22767d76d129e3049da6df14.79535 Ether
0x7859be88998e341c3e6c11b9e896183d29d9fa5b7f4087952a7bc7f62e0e25d5119515752021-03-01 9:42:3415 hrs 36 mins ago DeversiFi 20x5995a5324dbbde36391cb553ea688826c3f8319b16.45401779 Ether
0x855e1c1ed363ffa720655b43080ba20f61aaaa554f5753d6fb96b4948ab94d72119514932021-03-01 9:22:2215 hrs 57 mins ago DeversiFi 20x111f33a2c69b34500e6acd4b21dd84be679bfd471 Ether
0xcd0b87bbfbb1c1fe01bc179f3168f64a9ef0f0e46c10ce6f733d8c1f0233a1b9119513932021-03-01 8:57:5516 hrs 21 mins ago DeversiFi 20xde07abf5663b88fbd0974ee69b3bc75971a2938110 Ether
0xb7c25fa41c124fd89188daf17647f76122f04d9b9f2c1b9f08be41d6986814bd119402652021-02-27 15:56:012 days 9 hrs ago DeversiFi 20xa9ce7b858b81efc914c881e648f3aea3f3980b121.22 Ether
0x65bbb5a3d6a676554cc7f5f16b41998eff53678ba4b885138cd6b8db38239dc3119396132021-02-27 13:27:082 days 11 hrs ago DeversiFi 20xf7700944b35c3f85a23e9d77bee065dc4f10d6f79 Ether
0x19eeb1ed7ae7efa365269c511ec5b5dc0f937ac92a235a11b5cc7c0441006d65119334572021-02-26 14:48:443 days 10 hrs ago DeversiFi 20xde07abf5663b88fbd0974ee69b3bc75971a2938120 Ether
0x31c229a8ceadb39517c51357b91e8caf85b773bb436a10e7117b8d3f530fcca3119329812021-02-26 12:54:543 days 12 hrs ago DeversiFi 20xd58308b79cb22b93f70dbd88aa5a65d1859adf9a6 Ether
0xcdcb71a31c856e717b77f839734146d807d4d2590ad75209670d4cda752f3e65119303662021-02-26 3:18:563 days 22 hrs ago DeversiFi 20x7fe9c1ea39c77297b0d994c413d649130e391d899.90234417 Ether
0xf927e4e3fe68ac554af7016f28390840895cd66e423385b7cfc309cd2e1007f2119302562021-02-26 2:54:473 days 22 hrs ago DeversiFi 20x5c70362919df07762c3f99657c0ed0ea9e8cd1590.1 Ether
0x9c76e8e14af4a6c197ce22960a42921bbbda5f75f49d326e7827f9ca7d5d9099119294172021-02-25 23:49:414 days 1 hr ago DeversiFi 20x3b6627c4fa0e52e219608ace14b12219a6aa72b554 Ether
0x2849aaaa3341d5a055d81a8db29ec5ee06d069473e8cf8656985c1feb875f30c119293902021-02-25 23:40:404 days 1 hr ago DeversiFi 20x2a8e1ec5ede2972986e3ef39bc44858828b54fe650 Ether
0x40be6bb6f6f217a01bf4a90c4678076fc4c5ebe8fc6443182c69165d059e3806119292372021-02-25 23:11:584 days 2 hrs ago DeversiFi 20x53d290220b4ae5cd91987517ef04e206c10788500.49925479 Ether
0xb743b96f277730d130e089d2154bdec60cb190ba19450b8d562271b60e82f5b9119286852021-02-25 21:09:514 days 4 hrs ago DeversiFi 20x09e66e933f9f16817a736ef543f424f0e4eee8220.100335 Ether
0x71891eb67e8d0ffd8064f7b45558ffa5308f4ff9038d78c903ba9a1d8169c9c8119282352021-02-25 19:32:214 days 5 hrs ago DeversiFi 20x50ebff55962413d52bfd1f782f8d3e1c50de87ca0.043029 Ether
0x445fc20d29583d33e80ae239971c4424d92c79f925624a3539f77682e24ff088119259412021-02-25 11:01:404 days 14 hrs ago DeversiFi 20x2a8e1ec5ede2972986e3ef39bc44858828b54fe6864 Ether
0x102b196a3eb076af61f00ba56caebbb31714cb499774af4fa926b7ec0ade8d0c119259292021-02-25 10:57:494 days 14 hrs ago DeversiFi 20x3b6627c4fa0e52e219608ace14b12219a6aa72b5457 Ether
0xa2dcf628ab8ab850bdee911d6412a56a8d6d94eabdf8c91ea4780e17bd5ae4ed119248902021-02-25 7:13:054 days 18 hrs ago DeversiFi 20x36c61893f2ea0dce7c98b183cbcd82875f44c44137.927 Ether
0x588202c7ca24157bedcc342d428964dd0302b197016d4eb53c373e1381f5e754119245452021-02-25 6:01:584 days 19 hrs ago DeversiFi 20xd1ff792f651a0c896f37ef4c74f5b2ed24b6a8d50.1 Ether
0x375b751cfe03c8046e2d11b6386241eee917b77b9ddec867d21f8da847ed9362119213682021-02-24 18:12:415 days 7 hrs ago DeversiFi 20x1eb66a75215a0ee8c88bc99125fbe8e387419f381 Ether
0xa187373db2330cb261df0f8c91f9ec83c32083203d566e30f23825cbf35c5100119212142021-02-24 17:38:255 days 7 hrs ago DeversiFi 20x364791ab0ccc11f0b641a9969648ee1a2270b8978 Ether
0x58ade2960d8a0a2cfab89886970a3a0330e8e00ebf1aba8fef693232608972a3119202492021-02-24 14:01:015 days 11 hrs ago DeversiFi 20x3b6627c4fa0e52e219608ace14b12219a6aa72b5308 Ether
0x49e845533d2433011c5d07b6f0b9b1d5d04ec61caa6416ab0317a379fdc68d6d119199052021-02-24 12:44:295 days 12 hrs ago DeversiFi 20x3b6627c4fa0e52e219608ace14b12219a6aa72b5290 Ether
0x923473c8dd587aa68c28f800c384bd08fe41defd06a297a80534872fb7aaef61119190802021-02-24 9:44:375 days 15 hrs ago DeversiFi 20x977bcc40cd619cd57c22767d76d129e3049da6df18.63294 Ether
0x0381e793e35fab1320ffe5cb58390151d53f5bab6c8687a940efd715ba7a2170119178702021-02-24 5:03:095 days 20 hrs ago DeversiFi 20xe3c91b656d25dea0479685854ebc41aae213ad451.78393125 Ether
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Contract Source Code Verified (Exact Match)

Contract Name:
Proxy

Compiler Version
v0.5.15+commit.6a57276f

Optimization Enabled:
Yes with 100 runs

Other Settings:
default evmVersion, Apache-2.0 license

Contract Source Code (Solidity Multiple files format)

File 5 of 7: Proxy.sol
/*
  Copyright 2019,2020 StarkWare Industries Ltd.

  Licensed under the Apache License, Version 2.0 (the "License").
  You may not use this file except in compliance with the License.
  You may obtain a copy of the License at

  https://www.starkware.co/open-source-license/

  Unless required by applicable law or agreed to in writing,
  software distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions
  and limitations under the License.
*/
pragma solidity ^0.5.2;

import "ProxyGovernance.sol";
import "ProxyStorage.sol";
import "Common.sol";

/**
  The Proxy contract implements delegation of calls to other contracts (`implementations`), with
  proper forwarding of return values and revert reasons. This pattern allows retaining the contract
  storage while replacing implementation code.

  The following operations are supported by the proxy contract:

  - :sol:func:`addImplementation`: Defines a new implementation, the data with which it should be initialized and whether this will be the last version of implementation.
  - :sol:func:`upgradeTo`: Once an implementation is added, the governor may upgrade to that implementation only after a safety time period has passed (time lock), the current implementation is not the last version and the implementation is not frozen (see :sol:mod:`FullWithdrawals`).
  - :sol:func:`removeImplementation`: Any announced implementation may be removed. Removing an implementation is especially important once it has been used for an upgrade in order to avoid an additional unwanted revert to an older version.

  The only entity allowed to perform the above operations is the proxy governor
  (see :sol:mod:`ProxyGovernance`).

  Every implementation is required to have an `initialize` function that replaces the constructor
  of a normal contract. Furthermore, the only parameter of this function is an array of bytes
  (`data`) which may be decoded arbitrarily by the `initialize` function. It is up to the
  implementation to ensure that this function cannot be run more than once if so desired.

  When an implementation is added (:sol:func:`addImplementation`) the initialization `data` is also
  announced, allowing users of the contract to analyze the full effect of an upgrade to the new
  implementation. During an :sol:func:`upgradeTo`, the `data` is provided again and only if it is
  identical to the announced `data` is the upgrade performed by pointing the proxy to the new
  implementation and calling its `initialize` function with this `data`.

  It is the responsibility of the implementation not to overwrite any storage belonging to the
  proxy (`ProxyStorage`). In addition, upon upgrade, the new implementation is assumed to be
  backward compatible with previous implementations with respect to the storage used until that
  point.
*/
contract Proxy is ProxyStorage, ProxyGovernance {

    // Emitted when the active implementation is replaced.
    event Upgraded(address indexed implementation);

    // Emitted when an implementation is submitted as an upgrade candidate and a time lock
    // is activated.
    event ImplementationAdded(address indexed implementation, bytes initializer, bool finalize);

    // Emitted when an implementation is removed from the list of upgrade candidates.
    event ImplementationRemoved(address indexed implementation);

    // Emitted when the implementation is finalized.
    event FinalizedImplementation(address indexed implementation);

    // Storage slot with the address of the current implementation.
    // The address of the slot is keccak256("StarkWare2019.implemntation-slot").
    // We need to keep this variable stored outside of the commonly used space,
    // so that it's not overrun by the logical implementaiton (the proxied contract).
    bytes32 internal constant IMPLEMENTATION_SLOT =
    0x177667240aeeea7e35eabe3a35e18306f336219e1386f7710a6bf8783f761b24;

    // This storage slot stores the finalization flag.
    // Once the value stored in this slot is set to non-zero
    // the proxy blocks implementation upgrades.
    // The current implementation is then referred to as Finalized.
    // Web3.solidityKeccak(['string'], ["StarkWare2019.finalization-flag-slot"]).
    bytes32 internal constant FINALIZED_STATE_SLOT =
    0x7d433c6f837e8f93009937c466c82efbb5ba621fae36886d0cac433c5d0aa7d2;
    uint256 public constant UPGRADE_ACTIVATION_DELAY = 28 days;

    using Addresses for address;

    constructor ( )
        public
    {
        initGovernance();
    }

    /*
      Returns true if the implementation is frozen.
      If the implementation was not assigned yet, returns false.
    */
    function implementationIsFrozen() private returns (bool) {
        address _implementation = implementation();

        // We can't call low level implementation before it's assigned. (i.e. ZERO).
        if (_implementation == ZERO_ADDRESS) {
            return false;
        }
        // solium-disable-next-line security/no-low-level-calls
        (bool success, bytes memory returndata) = _implementation.delegatecall(
            abi.encodeWithSignature("isFrozen()"));
        require(success, string(returndata));
        return abi.decode(returndata, (bool));
    }

    /*
      This method blocks delegation to initialize().
      Only upgradeTo should be able to delegate call to initialize().
    */
    function initialize(bytes calldata /*data*/)
        external pure
    {
        revert("CANNOT_CALL_INITIALIZE");
    }

    modifier notFinalized()
    {
        require(isNotFinalized(), "IMPLEMENTATION_FINALIZED");
        _;
    }

    /*
      Forbids calling the function if the implementation is frozen.
      This modifier relies on the lower level (logical contract) implementation of isFrozen().
    */
    modifier notFrozen()
    {
        require(implementationIsFrozen() == false, "STATE_IS_FROZEN");
        _;
    }

    /*
      Contract's default function. Delegates execution to the implementation contract.
      It returns back to the external caller whatever the implementation delegated code returns.
    */
    function () external payable {
        address _implementation = implementation();
        require (_implementation != ZERO_ADDRESS, "MISSING_IMPLEMENTATION");

        // solium-disable-next-line security/no-inline-assembly
        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 for now, as we don't know the out 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) }
        }
    }

    /*
      Returns the address of the current implementation.
    */
    function implementation() public view returns (address _implementation) {
        bytes32 slot = IMPLEMENTATION_SLOT;
        // solium-disable-next-line security/no-inline-assembly
        assembly {
            _implementation := sload(slot)
        }
    }

    /*
      Sets the implementation address of the proxy.
    */
    function setImplementation(address newImplementation) private {
        bytes32 slot = IMPLEMENTATION_SLOT;
        // solium-disable-next-line security/no-inline-assembly
        assembly {
            sstore(slot, newImplementation)
        }
    }

    /*
      Returns true if the contract is not in the finalized state.
    */
    function isNotFinalized() public view returns (bool notFinal) {
        bytes32 slot = FINALIZED_STATE_SLOT;
        uint256 slotValue;
        // solium-disable-next-line security/no-inline-assembly
        assembly {
            slotValue := sload(slot)
        }
        notFinal = (slotValue == 0);
    }

    /*
      Marks the current implementation as finalized.
    */
    function setFinalizedFlag() private {
        bytes32 slot = FINALIZED_STATE_SLOT;
        // solium-disable-next-line security/no-inline-assembly
        assembly {
            sstore(slot, 0x1)
        }
    }

    /*
      Introduce an implementation and its initialization vector,
      and start the time-lock before it can be upgraded to.
      addImplementation is not blocked when frozen or finalized.
      (upgradeTo API is blocked when finalized or frozen).
    */
    function addImplementation(address newImplementation, bytes calldata data, bool finalize)
        external onlyGovernance {
        require(newImplementation.isContract(), "ADDRESS_NOT_CONTRACT");

        bytes32 init_hash = keccak256(abi.encode(data, finalize));
        initializationHash[newImplementation] = init_hash;

        // solium-disable-next-line security/no-block-members
        uint256 activation_time = now + UPGRADE_ACTIVATION_DELAY;

        // First implementation should not have time-lock.
        if (implementation() == ZERO_ADDRESS) {
            // solium-disable-next-line security/no-block-members
            activation_time = now;
        }

        enabledTime[newImplementation] = activation_time;
        emit ImplementationAdded(newImplementation, data, finalize);
    }

    /*
      Removes a candidate implementation.
      Note that it is possible to remove the current implementation. Doing so doesn't affect the
      current implementation, but rather revokes it as a future candidate.
    */
    function removeImplementation(address newImplementation)
        external onlyGovernance {

        // If we have initializer, we set the hash of it.
        uint256 activation_time = enabledTime[newImplementation];

        require(activation_time > 0, "ADDRESS_NOT_UPGRADE_CANDIDATE");

        enabledTime[newImplementation] = 0;

        initializationHash[newImplementation] = 0;
        emit ImplementationRemoved(newImplementation);
    }

    /*
      Upgrades the proxy to a new implementation, with its initialization.
      to upgrade successfully, implementation must have been added time-lock agreeably
      before, and the init vector must be identical ot the one submitted before.

      Upon assignment of new implementation address,
      its initialize will be called with the inititalizing vector (even if empty).
      Therefore, the implementatin MUST must have such a method.
    */
    function upgradeTo(address newImplementation, bytes calldata data, bool finalize)
        external payable onlyGovernance notFinalized notFrozen {
        uint256 activation_time = enabledTime[newImplementation];

        require(activation_time > 0, "ADDRESS_NOT_UPGRADE_CANDIDATE");
        // solium-disable-next-line security/no-block-members
        require(activation_time <= now, "UPGRADE_NOT_ENABLED_YET");

        bytes32 init_vector_hash = initializationHash[newImplementation];
        require(init_vector_hash == keccak256(abi.encode(data, finalize)), "CHANGED_INITIALIZER");
        setImplementation(newImplementation);

        // solium-disable-next-line security/no-low-level-calls
        (bool success, bytes memory returndata) = newImplementation.delegatecall(
            abi.encodeWithSelector(this.initialize.selector, data));
        require(success, string(returndata));

        // Verify that the new implementation is not frozen post initialization.
        (success, returndata) = newImplementation.delegatecall(
            abi.encodeWithSignature("isFrozen()"));
        require(success, "CALL_TO_ISFROZEN_REVERTED");
        require(abi.decode(returndata, (bool)) == false, "NEW_IMPLEMENTATION_FROZEN");

        if (finalize == true) {
            setFinalizedFlag();
            emit FinalizedImplementation(newImplementation);
        }

        emit Upgraded(newImplementation);
    }
}

File 1 of 7: Common.sol
/*
  Copyright 2019,2020 StarkWare Industries Ltd.

  Licensed under the Apache License, Version 2.0 (the "License").
  You may not use this file except in compliance with the License.
  You may obtain a copy of the License at

  https://www.starkware.co/open-source-license/

  Unless required by applicable law or agreed to in writing,
  software distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions
  and limitations under the License.
*/
pragma solidity ^0.5.2;

/*
  Common Utility libraries.
  1. Addresses (extending address).
*/
library Addresses {
    function isContract(address account) internal view returns (bool) {
        uint256 size;
        // solium-disable-next-line security/no-inline-assembly
        assembly {
            size := extcodesize(account)
        }
        return size > 0;
    }
}

File 2 of 7: Governance.sol
/*
  Copyright 2019,2020 StarkWare Industries Ltd.

  Licensed under the Apache License, Version 2.0 (the "License").
  You may not use this file except in compliance with the License.
  You may obtain a copy of the License at

  https://www.starkware.co/open-source-license/

  Unless required by applicable law or agreed to in writing,
  software distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions
  and limitations under the License.
*/
pragma solidity ^0.5.2;

import "GovernanceStorage.sol";
import "MGovernance.sol";

/*
  Implements Generic Governance, applicable for both proxy and main contract, and possibly others.
  Notes:
  1. This class is virtual (getGovernanceTag is not implemented).
  2. The use of the same function names by both the Proxy and a delegated implementation
     is not possible since calling the implementation functions is done via the default function
     of the Proxy. For this reason, for example, the implementation of MainContract (MainGovernance)
     exposes mainIsGovernor, which calls the internal isGovernor method.
*/
contract Governance is GovernanceStorage, MGovernance {
    event LogNominatedGovernor(address nominatedGovernor);
    event LogNewGovernorAccepted(address acceptedGovernor);
    event LogRemovedGovernor(address removedGovernor);
    event LogNominationCancelled();

    address internal constant ZERO_ADDRESS = address(0x0);

    /*
      Returns a string which uniquely identifies the type of the governance mechanism.
    */
    function getGovernanceTag()
        internal
        view
        returns (string memory);

    /*
      Returns the GovernanceInfoStruct associated with the governance tag.
    */
    function contractGovernanceInfo()
        internal
        view
        returns (GovernanceInfoStruct storage) {
        string memory tag = getGovernanceTag();
        GovernanceInfoStruct storage gub = governanceInfo[tag];
        require(gub.initialized == true, "NOT_INITIALIZED");
        return gub;
    }

    function initGovernance()
        internal
    {
        string memory tag = getGovernanceTag();
        GovernanceInfoStruct storage gub = governanceInfo[tag];
        require(gub.initialized == false, "ALREADY_INITIALIZED");
        gub.initialized = true;  // to ensure addGovernor() won't fail.
        // Add the initial governer.
        addGovernor(msg.sender);
    }

    modifier onlyGovernance()
    {
        require(isGovernor(msg.sender), "ONLY_GOVERNANCE");
        _;
    }

    function isGovernor(address testGovernor)
        internal view
        returns (bool addressIsGovernor){
        GovernanceInfoStruct storage gub = contractGovernanceInfo();
        addressIsGovernor = gub.effectiveGovernors[testGovernor];
    }

    /*
      Cancels the nomination of a governor condidate.
    */
    function cancelNomination() internal onlyGovernance() {
        GovernanceInfoStruct storage gub = contractGovernanceInfo();
        gub.candidateGovernor = ZERO_ADDRESS;
        emit LogNominationCancelled();
    }

    function nominateNewGovernor(address newGovernor) internal onlyGovernance() {
        GovernanceInfoStruct storage gub = contractGovernanceInfo();
        require(isGovernor(newGovernor) == false, "ALREADY_GOVERNOR");
        gub.candidateGovernor = newGovernor;
        emit LogNominatedGovernor(newGovernor);
    }

    /*
      The addGovernor is called in two cases:
      1. by acceptGovernance when a new governor accepts its role.
      2. by initGovernance to add the initial governor.
      The difference is that the init path skips the nominate step
      that would fail because of the onlyGovernance modifier.
    */
    function addGovernor(address newGovernor) private {
        require(isGovernor(newGovernor) == false, "ALREADY_GOVERNOR");
        GovernanceInfoStruct storage gub = contractGovernanceInfo();
        gub.effectiveGovernors[newGovernor] = true;
    }

    function acceptGovernance()
        internal
    {
        // The new governor was proposed as a candidate by the current governor.
        GovernanceInfoStruct storage gub = contractGovernanceInfo();
        require(msg.sender == gub.candidateGovernor, "ONLY_CANDIDATE_GOVERNOR");

        // Update state.
        addGovernor(gub.candidateGovernor);
        gub.candidateGovernor = ZERO_ADDRESS;

        // Send a notification about the change of governor.
        emit LogNewGovernorAccepted(msg.sender);
    }

    /*
      Remove a governor from office.
    */
    function removeGovernor(address governorForRemoval) internal onlyGovernance() {
        require(msg.sender != governorForRemoval, "GOVERNOR_SELF_REMOVE");
        GovernanceInfoStruct storage gub = contractGovernanceInfo();
        require (isGovernor(governorForRemoval), "NOT_GOVERNOR");
        gub.effectiveGovernors[governorForRemoval] = false;
        emit LogRemovedGovernor(governorForRemoval);
    }
}

File 3 of 7: GovernanceStorage.sol
/*
  Copyright 2019,2020 StarkWare Industries Ltd.

  Licensed under the Apache License, Version 2.0 (the "License").
  You may not use this file except in compliance with the License.
  You may obtain a copy of the License at

  https://www.starkware.co/open-source-license/

  Unless required by applicable law or agreed to in writing,
  software distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions
  and limitations under the License.
*/
pragma solidity ^0.5.2;

/*
  Holds the governance slots for ALL entities, including proxy and the main contract.
*/
contract GovernanceStorage {

    struct GovernanceInfoStruct {
        mapping (address => bool) effectiveGovernors;
        address candidateGovernor;
        bool initialized;
    }

    // A map from a Governor tag to its own GovernanceInfoStruct.
    mapping (string => GovernanceInfoStruct) internal governanceInfo;
}

File 4 of 7: MGovernance.sol
/*
  Copyright 2019,2020 StarkWare Industries Ltd.

  Licensed under the Apache License, Version 2.0 (the "License").
  You may not use this file except in compliance with the License.
  You may obtain a copy of the License at

  https://www.starkware.co/open-source-license/

  Unless required by applicable law or agreed to in writing,
  software distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions
  and limitations under the License.
*/
pragma solidity ^0.5.2;

contract MGovernance {
    /*
      Allows calling the function only by a Governor.
    */
    modifier onlyGovernance()
    {
        // Pure modifier declarations are not supported. Instead we provide
        // a dummy definition.
        revert("UNIMPLEMENTED");
        _;
    }
}

File 6 of 7: ProxyGovernance.sol
/*
  Copyright 2019,2020 StarkWare Industries Ltd.

  Licensed under the Apache License, Version 2.0 (the "License").
  You may not use this file except in compliance with the License.
  You may obtain a copy of the License at

  https://www.starkware.co/open-source-license/

  Unless required by applicable law or agreed to in writing,
  software distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions
  and limitations under the License.
*/
pragma solidity ^0.5.2;

import "Governance.sol";

/**
  The Proxy contract is governed by one or more Governors of which the initial one is the
  deployer of the contract.

  A governor has the sole authority to perform the following operations:

  1. Nominate additional governors (:sol:func:`proxyNominateNewGovernor`)
  2. Remove other governors (:sol:func:`proxyRemoveGovernor`)
  3. Add new `implementations` (proxied contracts)
  4. Remove (new or old) `implementations`
  5. Update `implementations` after a timelock allows it

  Adding governors is performed in a two step procedure:

  1. First, an existing governor nominates a new governor (:sol:func:`proxyNominateNewGovernor`)
  2. Then, the new governor must accept governance to become a governor (:sol:func:`proxyAcceptGovernance`)

  This two step procedure ensures that a governor public key cannot be nominated unless there is an
  entity that has the corresponding private key. This is intended to prevent errors in the addition
  process.

  The governor private key should typically be held in a secure cold wallet or managed via a
  multi-sig contract.
*/
/*
  Implements Governance for the proxy contract.
  It is a thin wrapper to the Governance contract,
  which is needed so that it can have non-colliding function names,
  and a specific tag (key) to allow unique state storage.
*/
contract ProxyGovernance is Governance {

    // The tag is the string key that is used in the Governance storage mapping.
    string public constant PROXY_GOVERNANCE_TAG = "StarkEx.Proxy.2019.GovernorsInformation";

    function getGovernanceTag()
        internal
        view
        returns (string memory tag) {
        tag = PROXY_GOVERNANCE_TAG;
    }

    function proxyIsGovernor(address testGovernor) external view returns (bool) {
        return isGovernor(testGovernor);
    }

    function proxyNominateNewGovernor(address newGovernor) external {
        nominateNewGovernor(newGovernor);
    }

    function proxyRemoveGovernor(address governorForRemoval) external {
        removeGovernor(governorForRemoval);
    }

    function proxyAcceptGovernance()
        external
    {
        acceptGovernance();
    }

    function proxyCancelNomination() external {
        cancelNomination();
    }
}

File 7 of 7: ProxyStorage.sol
/*
  Copyright 2019,2020 StarkWare Industries Ltd.

  Licensed under the Apache License, Version 2.0 (the "License").
  You may not use this file except in compliance with the License.
  You may obtain a copy of the License at

  https://www.starkware.co/open-source-license/

  Unless required by applicable law or agreed to in writing,
  software distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions
  and limitations under the License.
*/
pragma solidity ^0.5.2;

import "GovernanceStorage.sol";

/*
  Holds the Proxy-specific state variables.
  This contract is inherited by the GovernanceStorage (and indirectly by MainStorage)
  to prevent collision hazard.
*/
contract ProxyStorage is GovernanceStorage {

    // Stores the hash of the initialization vector of the added implementation.
    // Upon upgradeTo the implementation, the initialization vector is verified
    // to be identical to the one submitted when adding the implementaion.
    mapping (address => bytes32) internal initializationHash;

    // The time after which we can switch to the implementation.
    mapping (address => uint256) internal enabledTime;

    // A central storage of the flags whether implementation has been initialized.
    // Note - it can be used flexibly enough to accomodate multiple level of initialization
    // (i.e. using different key salting schemes for different initialization levels).
    mapping (bytes32 => bool) internal initialized;
}

Contract Security Audit

Contract ABI

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Swarm Source

bzzr://8b1d55c2ed53dac498876abf4d45681898c9ff1fbd88f8103d56de2194a879ab
Block Transaction Difficulty Gas Used Reward
Block Uncle Number Difficulty Gas Used Reward
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