Contract 0x177d36dbe2271a4ddb2ad8304d82628eb921d790 16

 
Txn Hash Method
Block
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Value [Txn Fee]
0x6f9320e78356673de55be3405a39773490356d990a7567f90cc16238a772b4720x252f7b011859565292024-03-01 8:33:023 secs agoLayer Zero: Executor IN  Layer Zero: Relayer v20 ETH0.000259440.1
0xb1039a2881f65b08da194bd57f7dbeac88308259065b33facdd32c3ffb8f3d270x252f7b011859565092024-03-01 8:32:578 secs agoLayer Zero: Executor IN  Layer Zero: Relayer v20 ETH0.000210710.1
0xd3da149ad2b756089cf978fe7b94beb0044d47658af1c883510b9363314787180x252f7b011859564902024-03-01 8:32:5213 secs agoLayer Zero: Executor IN  Layer Zero: Relayer v20 ETH0.000261210.1
0x1a648e7935622f661a6bc1b33cfbd19ffcda3ad4b3edcbabe3d7839982e00a480x252f7b011859564892024-03-01 8:32:5213 secs agoLayer Zero: Executor IN  Layer Zero: Relayer v20 ETH0.000256340.1
0x394c5659ff8b6dc916fb07acce718ef287de99933689eaafb49a24db9a256d490x252f7b011859564822024-03-01 8:32:5015 secs agoLayer Zero: Executor IN  Layer Zero: Relayer v20 ETH0.000254950.1
0x7d1ca484dcb86ac685dae2ca9aafc1a77f08c94097e2656de135dd72c545571d0x252f7b011859564472024-03-01 8:32:4124 secs agoLayer Zero: Executor IN  Layer Zero: Relayer v20 ETH0.000223980.1
0x689f6a9fa20cbb050f5957579e61cf13070ca38bc477866851e4b7e9c9c1517c0x252f7b011859564422024-03-01 8:32:4025 secs agoLayer Zero: Executor IN  Layer Zero: Relayer v20 ETH0.0002590.1
0x867f30e3ea0c7efc164e7eb4cf33e27a648d9199f77ce8a1e631b03ab89ed84a0x252f7b011859564402024-03-01 8:32:4025 secs agoLayer Zero: Executor IN  Layer Zero: Relayer v20 ETH0.000265040.1
0xf3f0dc9f442aaec62f09aebed68a451a3c9e34452f0b4e9f6afa4fdaf5f9e8ae0x252f7b011859564212024-03-01 8:32:3530 secs agoLayer Zero: Executor IN  Layer Zero: Relayer v20 ETH0.00026370.1
0x42efaba776ad5c8693b8d36d1ba26474e0192260b77e7015b8c09b67fb1163a90x252f7b011859563852024-03-01 8:32:2639 secs agoLayer Zero: Executor IN  Layer Zero: Relayer v20 ETH0.000350990.1
0x37dda074522cee7a8e1c315ee020387fac556d23f44e4f2d3b17f5a5fcf268fb0x252f7b011859563772024-03-01 8:32:2441 secs agoLayer Zero: Executor IN  Layer Zero: Relayer v20 ETH0.000252140.1
0x95af216fe934cda0cf7776bdfa289264d75ff93b9d8aad9f2899035618a9fe290x252f7b011859563642024-03-01 8:32:2045 secs agoLayer Zero: Executor IN  Layer Zero: Relayer v20 ETH0.000328850.1
0xb9c6373d1bad48ac0bc7c3ab7671802cf6e240c23f30657dc113fa5c8df1b5720x252f7b011859563562024-03-01 8:32:1847 secs agoLayer Zero: Executor IN  Layer Zero: Relayer v20 ETH0.000261060.1
0x9ff85758181260ef7a7b3003a41280eb3d3dad741c6d56e0ac1c60ad228ab1990x252f7b011859563272024-03-01 8:32:1154 secs agoLayer Zero: Executor IN  Layer Zero: Relayer v20 ETH0.000224870.1
0xc2dc2405517372a8ea6e768b80ff8aa9593428dd1a6b338e718e3c55e87d1b7d0x252f7b011859563002024-03-01 8:32:041 min agoLayer Zero: Executor IN  Layer Zero: Relayer v20 ETH0.000263710.1
0x73425790c52d5b2d8e992c7f9a85bc06e141012148ac2b1862e0bdb6f84e3e650x252f7b011859562762024-03-01 8:31:581 min agoLayer Zero: Executor IN  Layer Zero: Relayer v20 ETH0.000386170.1
0xaf261fe71b327bdd47eed7122b32faa3f7e85dc04ac5f85aeed0b29a56e36d790x252f7b011859562662024-03-01 8:31:551 min agoLayer Zero: Executor IN  Layer Zero: Relayer v20 ETH0.000258990.1
0x6e211bea42b688c8f1ea9947678b22d810365f0f512ca760a607ffe3cbafd1c00x252f7b011859562642024-03-01 8:31:551 min agoLayer Zero: Executor IN  Layer Zero: Relayer v20 ETH0.000264590.1
0x71b8205a67fab73419644562c3f6b38c884d3e8956ccba213b93a377564387400x252f7b011859562632024-03-01 8:31:551 min agoLayer Zero: Executor IN  Layer Zero: Relayer v20 ETH0.000313720.1
0x7c52f3e15849035396477834fdcbf056f78df3d8757688afd1dc041d064a763f0x252f7b011859562622024-03-01 8:31:541 min agoLayer Zero: Executor IN  Layer Zero: Relayer v20 ETH0.000265760.1
0xf726c63a20e6d8316c11629ee58d79d8336826bcb6066e3ae96c52af2f9cf54d0x252f7b011859562572024-03-01 8:31:531 min agoLayer Zero: Executor IN  Layer Zero: Relayer v20 ETH0.000219520.1
0x1a02c08efdc36d49078de83038c07ed61db2049463db9a26134a2bc6cf2ee7650x252f7b011859562482024-03-01 8:31:511 min agoLayer Zero: Executor IN  Layer Zero: Relayer v20 ETH0.000241140.1
0x36d2b0f89108b13189bf39d75c3ce1df09ec3e93f6125e8143280b464b0ea92b0x252f7b011859561652024-03-01 8:31:301 min agoLayer Zero: Executor IN  Layer Zero: Relayer v20 ETH0.000269310.1
0x7d80374cc8e71d112d1f4486608eb6a5624122536ae3212162e15c7970a00f430x252f7b011859561522024-03-01 8:31:271 min agoLayer Zero: Executor IN  Layer Zero: Relayer v20 ETH0.000347510.1
0x034f0f6e10b76ece004d6cf3b4f47c09f200e2f4203b7b7e2ee896300e8457df0x252f7b011859560742024-03-01 8:31:071 min agoLayer Zero: Executor IN  Layer Zero: Relayer v20 ETH0.000251310.1
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Latest 25 internal transaction
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0xb98824bc9416fbe957088e133d180eb0c9134775a997a6d80035b2587887f2f71859553702024-03-01 8:28:074 mins ago Layer Zero: Relayer v20x88ad675a2d3d90c8e88543a4f10143bf953028350.001746643880485963 ETH
0x642785a121caaea1f39297f9173c7174ec20255caefc45b6ec2472bce76289171859553202024-03-01 8:27:555 mins ago Layer Zero: Relayer v20xf8c8339e3c450eb48d43fe9af3f28805a6c9227a0.0005 ETH
0x9ab1eb646bfe5dc538fea9774e7d994a320a5550459c0bdd7e55ee11c8d61be91859547102024-03-01 8:25:247 mins ago Layer Zero: Relayer v20xf238aa53d8a66dbefc0ba643e66a20a40986ad1a0.002328230503197429 ETH
0x67d038350ab62995d68ae478b76891dc3974182c004010aff018584b229621881859544902024-03-01 8:24:288 mins ago Layer Zero: Relayer v20xfbf9df82c10761c6bab8820486272cd8b34e70930.00046 ETH
0x798d222766a9cc26f3574583ef97ed50d87168c56f17598af0d67527f8807d5f1859544552024-03-01 8:24:208 mins ago Layer Zero: Relayer v20x46a8b7b743ad02908802ad33ce5b86462d4a5f3a0.0005 ETH
0xde1b039f3ab6eb966a1ab8565b23eeccd37f21c1c800e2ae4e69a22539c02b691859540262024-03-01 8:22:3210 mins ago Layer Zero: Relayer v20x72e28c7f34100afefc399fcc0ae041b8fe5841ae0.00001 ETH
0x8d93070922ea25e78fdbdc6f738752b54ce9029fe65aa7fb84af6b663ce3dc121859538602024-03-01 8:21:5111 mins ago Layer Zero: Relayer v20xb1c15c26cb97fd5d3cbccaf2009eea34e4bd007e0.00006 ETH
0x9556915552213427f21df2f4f3944e64f2901ef8c7e44eb81a72cb9482f6e2e21859536772024-03-01 8:21:0512 mins ago Layer Zero: Relayer v20x309fc05564062f3d5c89c4239b6fea2b05c45aea0.000451 ETH
0xef2287e9f660e7683703843e6425bbc504367af51453a5a18404760d3a2cabbf1859535402024-03-01 8:20:3312 mins ago Layer Zero: Relayer v20xf238aa53d8a66dbefc0ba643e66a20a40986ad1a0.000879930116133521 ETH
0x00055d461eeda784b0fc01a38167d22c6b67efda645bb0d6ce9efe3620ef370c1859534402024-03-01 8:20:0812 mins ago Layer Zero: Relayer v20x77b258093d3ef8402c26db4229aa398f8bb9bd220.0005 ETH
0x3d0a465dd6836da26b6335c2bd97d3694b29be3e0e6cf89b3b59e617deb69dcb1859528142024-03-01 8:17:3015 mins ago Layer Zero: Relayer v20xec57e648432499a2d0479ea9b48979fd9206bb2b0.0005 ETH
0x595f87ec47f742a7443395d7928e9b31f3efd3deba1da744e5d6fdbd2726696a1859522342024-03-01 8:15:0418 mins ago Layer Zero: Relayer v20xec1a81d46736756c24e4e612e634cc6be0f9b7850.002 ETH
0xa1fcc549f912acf6ba2ea6f67d31a035d6c01036f80e4d303a6b9518afffcdac1859522062024-03-01 8:14:5718 mins ago Layer Zero: Relayer v20x5b6094efec63e693b259943bcb9f90faca4069770.0005 ETH
0x860238599f822805f88a259df6ff8470694abc21dcbf0b9410e531fc03ad0cbe1859518992024-03-01 8:13:4119 mins ago Layer Zero: Relayer v20x44c3116bfb71bf6ccab91061b0636f695346ea6d0.001746643880485963 ETH
0xc8a320457b46c90b8b9a65f86ca8fb971cc96285be85218588f9766d09a12d281859516592024-03-01 8:12:4020 mins ago Layer Zero: Relayer v20xeb2c64112c5d9116f0aeb4ef68d8151ed4b2a7220.00151 ETH
0xa43bc354a20f75317a593a1aadf4da12ebc688ec14dd0761b6b83a7ab5bf4fe61859516302024-03-01 8:12:3220 mins ago Layer Zero: Relayer v2 0xac8951a442fe70342f9597044b7b7657d5ad55ec0.000061049872798651 ETH
0xaf3235c3caeabab2486a78d45b8a561909480d2f8caddb8f683ef768cdb8d31f1859512232024-03-01 8:10:4922 mins ago Layer Zero: Relayer v20x9861eac9be188f4117612d2a89f058bf2372adce0.001443710857407575 ETH
0xc43738ba6d5089cfe2a5bd511f91d051f3edc8cd5dc5f04fcd6565dc066656761859510532024-03-01 8:10:0523 mins ago Layer Zero: Relayer v20x8ab74964d08244e766c7758158a1236e5f9f32cf0.00225064 ETH
0x0f2525fca57632313fd70c0b910f58399cea0541944598eb2af7ebc97a17a7a21859508412024-03-01 8:09:1223 mins ago Layer Zero: Relayer v20x67350f17cc7265485c307e88ddb32c2a7a1b93a50.001 ETH
0x7be52de4dbf62678f13fafb7d497256c8fc3d9d101c2ccc3833e38f3149364b21859501812024-03-01 8:06:2826 mins ago Layer Zero: Relayer v20x70f2fc6433ea72dd551742f93013a165e1d3427a0.00008736 ETH
0x13bbe89f411b1a0a2ffd99cb95268d37598c8dcdfeb82b1372496ebe12ebcca91859501792024-03-01 8:06:2726 mins ago Layer Zero: Relayer v20xd816dbf9402bf9bc07d95dbe1b578ace34c00fab0.001 ETH
0x59e3403108e6578d99433a5fe55da31d76d4882fd54e5e29f63361e6a997f1671859497492024-03-01 8:04:3728 mins ago Layer Zero: Relayer v20x61bf7001eaf636baad52ccdb6c791bb6b00126710.000582645 ETH
0xeae7ad0002c2e48919c472322755137234a6d46781421820be63d936fd7655761859497092024-03-01 8:04:2628 mins ago Layer Zero: Relayer v20x2c8940db0a1402c03fcf74003841e691277cdbe00.000465 ETH
0x799961c83aa8c9d0777f870f54a6567f399dd97d83a1679dcdfec115f38e511f1859496852024-03-01 8:04:2028 mins ago Layer Zero: Relayer v20x83290de81b0ea825a5bb913f296c0b68db6c0b990.0007 ETH
0x6893a50673c9d3ee6105862f924f5e822963e310b44693032a8ca496c51ddc641859479822024-03-01 7:57:0635 mins ago Layer Zero: Relayer v20x3d3a26c0afdc98dc94b174b5afb66e73f33a833d0.0007 ETH
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This contract may be a proxy contract. Click on More Options and select Is this a proxy? to confirm and enable the "Read as Proxy" & "Write as Proxy" tabs.

Similar Match Source Code
This contract matches the deployed Bytecode of the Source Code for Contract 0x965B104e250648d01d4B3b72BaC751Cde809D29E
The constructor portion of the code might be different and could alter the actual behaviour of the contract

Contract Name:
OptimizedTransparentUpgradeableProxy

Compiler Version
v0.7.6+commit.7338295f

Optimization Enabled:
Yes with 999999 runs

Other Settings:
istanbul EvmVersion, MIT license
File 1 of 4 : Proxy.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.7.0;

/**
 * @dev This abstract contract provides a fallback function that delegates all calls to another contract using the EVM
 * instruction `delegatecall`. We refer to the second contract as the _implementation_ behind the proxy, and it has to
 * be specified by overriding the virtual {_implementation} function.
 * 
 * Additionally, delegation to the implementation can be triggered manually through the {_fallback} function, or to a
 * different contract through the {_delegate} function.
 * 
 * The success and return data of the delegated call will be returned back to the caller of the proxy.
 */
abstract contract Proxy {
    /**
     * @dev Delegates the current call to `implementation`.
     * 
     * This function does not return to its internall call site, it will return directly to the external caller.
     */
    function _delegate(address implementation) internal {
        // solhint-disable-next-line 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 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 This is a virtual function that should be overriden so it returns the address to which the fallback function
     * and {_fallback} should delegate.
     */
    function _implementation() internal virtual view returns (address);

    /**
     * @dev Delegates the current call to the address returned by `_implementation()`.
     * 
     * This function does not return to its internall call site, it will return directly to the external caller.
     */
    function _fallback() internal {
        _beforeFallback();
        _delegate(_implementation());
    }

    /**
     * @dev Fallback function that delegates calls to the address returned by `_implementation()`. Will run if no other
     * function in the contract matches the call data.
     */
    fallback () payable external {
        _fallback();
    }

    /**
     * @dev Fallback function that delegates calls to the address returned by `_implementation()`. Will run if call data
     * is empty.
     */
    receive () payable external {
        _fallback();
    }

    /**
     * @dev Hook that is called before falling back to the implementation. Can happen as part of a manual `_fallback`
     * call, or as part of the Solidity `fallback` or `receive` functions.
     * 
     * If overriden should call `super._beforeFallback()`.
     */
    function _beforeFallback() internal virtual {
    }
}

File 2 of 4 : UpgradeableProxy.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.7.0;

import "./Proxy.sol";
import "../utils/Address.sol";

/**
 * @dev This contract implements an upgradeable proxy. It is upgradeable because calls are delegated to an
 * implementation address that can be changed. This address is stored in storage in the location specified by
 * https://eips.ethereum.org/EIPS/eip-1967[EIP1967], so that it doesn't conflict with the storage layout of the
 * implementation behind the proxy.
 * 
 * Upgradeability is only provided internally through {_upgradeTo}. For an externally upgradeable proxy see
 * {TransparentUpgradeableProxy}.
 */
contract UpgradeableProxy is Proxy {
    /**
     * @dev Initializes the upgradeable proxy with an initial implementation specified by `_logic`.
     * 
     * If `_data` is nonempty, it's used as data in a delegate call to `_logic`. This will typically be an encoded
     * function call, and allows initializating the storage of the proxy like a Solidity constructor.
     */
    constructor(address _logic, bytes memory _data) payable {
        assert(_IMPLEMENTATION_SLOT == bytes32(uint256(keccak256("eip1967.proxy.implementation")) - 1));
        _setImplementation(_logic);
        if(_data.length > 0) {
            // solhint-disable-next-line avoid-low-level-calls
            (bool success,) = _logic.delegatecall(_data);
            require(success);
        }
    }

    /**
     * @dev Emitted when the implementation is upgraded.
     */
    event Upgraded(address indexed implementation);

    /**
     * @dev Storage slot with the address of the current implementation.
     * This is the keccak-256 hash of "eip1967.proxy.implementation" subtracted by 1, and is
     * validated in the constructor.
     */
    bytes32 private constant _IMPLEMENTATION_SLOT = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;

    /**
     * @dev Returns the current implementation address.
     */
    function _implementation() internal override view returns (address impl) {
        bytes32 slot = _IMPLEMENTATION_SLOT;
        // solhint-disable-next-line no-inline-assembly
        assembly {
            impl := sload(slot)
        }
    }

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

    /**
     * @dev Stores a new address in the EIP1967 implementation slot.
     */
    function _setImplementation(address newImplementation) private {
        require(Address.isContract(newImplementation), "UpgradeableProxy: new implementation is not a contract");

        bytes32 slot = _IMPLEMENTATION_SLOT;

        // solhint-disable-next-line no-inline-assembly
        assembly {
            sstore(slot, newImplementation)
        }
    }
}

File 3 of 4 : Address.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.7.0;

/**
 * @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) {
        // 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 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");
        return _functionCallWithValue(target, data, value, errorMessage);
    }

    function _functionCallWithValue(address target, bytes memory data, uint256 weiValue, string memory errorMessage) private returns (bytes memory) {
        require(isContract(target), "Address: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{ value: weiValue }(data);
        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);
            }
        }
    }
}

File 4 of 4 : OptimizedTransparentUpgradeableProxy.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.7.0;

import "../openzeppelin/proxy/UpgradeableProxy.sol";

/**
 * @dev This contract implements a proxy that is upgradeable by an admin.
 *
 * To avoid https://medium.com/nomic-labs-blog/malicious-backdoors-in-ethereum-proxies-62629adf3357[proxy selector
 * clashing], which can potentially be used in an attack, this contract uses the
 * https://blog.openzeppelin.com/the-transparent-proxy-pattern/[transparent proxy pattern]. This pattern implies two
 * things that go hand in hand:
 *
 * 1. If any account other than the admin calls the proxy, the call will be forwarded to the implementation, even if
 * that call matches one of the admin functions exposed by the proxy itself.
 * 2. If the admin calls the proxy, it can access the admin functions, but its calls will never be forwarded to the
 * implementation. If the admin tries to call a function on the implementation it will fail with an error that says
 * "admin cannot fallback to proxy target".
 *
 * These properties mean that the admin account can only be used for admin actions like upgrading the proxy or changing
 * the admin, so it's best if it's a dedicated account that is not used for anything else. This will avoid headaches due
 * to sudden errors when trying to call a function from the proxy implementation.
 *
 * Our recommendation is for the dedicated account to be an instance of the {ProxyAdmin} contract. If set up this way,
 * you should think of the `ProxyAdmin` instance as the real administrative inerface of your proxy.
 */
contract OptimizedTransparentUpgradeableProxy is UpgradeableProxy {
    address internal immutable _ADMIN;

    /**
     * @dev Initializes an upgradeable proxy managed by `_admin`, backed by the implementation at `_logic`, and
     * optionally initialized with `_data` as explained in {UpgradeableProxy-constructor}.
     */
    constructor(
        address initialLogic,
        address initialAdmin,
        bytes memory _data
    ) payable UpgradeableProxy(initialLogic, _data) {
        assert(_ADMIN_SLOT == bytes32(uint256(keccak256("eip1967.proxy.admin")) - 1));
        bytes32 slot = _ADMIN_SLOT;

        _ADMIN = initialAdmin;

        // still store it to work with EIP-1967
        // solhint-disable-next-line no-inline-assembly
        assembly {
            sstore(slot, initialAdmin)
        }
    }

    /**
     * @dev Storage slot with the admin of the contract.
     * This is the keccak-256 hash of "eip1967.proxy.admin" subtracted by 1, and is
     * validated in the constructor.
     */
    bytes32 private constant _ADMIN_SLOT = 0xb53127684a568b3173ae13b9f8a6016e243e63b6e8ee1178d6a717850b5d6103;

    /**
     * @dev Modifier used internally that will delegate the call to the implementation unless the sender is the admin.
     */
    modifier ifAdmin() {
        if (msg.sender == _admin()) {
            _;
        } else {
            _fallback();
        }
    }

    /**
     * @dev Returns the current admin.
     *
     * NOTE: Only the admin can call this function. See {ProxyAdmin-getProxyAdmin}.
     *
     * TIP: To get this value clients can read directly from the storage slot shown below (specified by EIP1967) using the
     * https://eth.wiki/json-rpc/API#eth_getstorageat[`eth_getStorageAt`] RPC call.
     * `0xb53127684a568b3173ae13b9f8a6016e243e63b6e8ee1178d6a717850b5d6103`
     */
    function admin() external ifAdmin returns (address) {
        return _admin();
    }

    /**
     * @dev Returns the current implementation.
     *
     * NOTE: Only the admin can call this function. See {ProxyAdmin-getProxyImplementation}.
     *
     * TIP: To get this value clients can read directly from the storage slot shown below (specified by EIP1967) using the
     * https://eth.wiki/json-rpc/API#eth_getstorageat[`eth_getStorageAt`] RPC call.
     * `0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc`
     */
    function implementation() external ifAdmin returns (address) {
        return _implementation();
    }

    /**
     * @dev Upgrade the implementation of the proxy.
     *
     * NOTE: Only the admin can call this function. See {ProxyAdmin-upgrade}.
     */
    function upgradeTo(address newImplementation) external ifAdmin {
        _upgradeTo(newImplementation);
    }

    /**
     * @dev Upgrade the implementation of the proxy, and then call a function from the new implementation as specified
     * by `data`, which should be an encoded function call. This is useful to initialize new storage variables in the
     * proxied contract.
     *
     * NOTE: Only the admin can call this function. See {ProxyAdmin-upgradeAndCall}.
     */
    function upgradeToAndCall(address newImplementation, bytes calldata data) external payable ifAdmin {
        _upgradeTo(newImplementation);
        // solhint-disable-next-line avoid-low-level-calls
        (bool success, ) = newImplementation.delegatecall(data);
        require(success);
    }

    /**
     * @dev Returns the current admin.
     */
    function _admin() internal view returns (address adm) {
        return _ADMIN;
    }

    /**
     * @dev Makes sure the admin cannot access the fallback function. See {Proxy-_beforeFallback}.
     */
    function _beforeFallback() internal virtual override {
        require(msg.sender != _admin(), "TransparentUpgradeableProxy: admin cannot fallback to proxy target");
        super._beforeFallback();
    }
}

Settings
{
  "evmVersion": "istanbul",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs",
    "useLiteralContent": true
  },
  "optimizer": {
    "enabled": true,
    "runs": 999999
  },
  "remappings": [],
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

Contract ABI

[{"inputs":[{"internalType":"address","name":"initialLogic","type":"address"},{"internalType":"address","name":"initialAdmin","type":"address"},{"internalType":"bytes","name":"_data","type":"bytes"}],"stateMutability":"payable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"implementation","type":"address"}],"name":"Upgraded","type":"event"},{"stateMutability":"payable","type":"fallback"},{"inputs":[],"name":"admin","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"implementation","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newImplementation","type":"address"}],"name":"upgradeTo","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newImplementation","type":"address"},{"internalType":"bytes","name":"data","type":"bytes"}],"name":"upgradeToAndCall","outputs":[],"stateMutability":"payable","type":"function"},{"stateMutability":"payable","type":"receive"}]

Deployed Bytecode

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Block Transaction Gas Used Reward
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