Contract 0xcb8fa9a76b8e203d8c3797bf438d8fb81ea3326a 15

 
Txn Hash Method
Block
From
To
Value
0xce31ca233cd5a7e68e9646ef81830d2c0cd3ad02daeb983f01b690bd4accf054Approve1180549762024-03-29 10:38:491 hr 51 mins ago0x386f2ea5b3edc41d34bcc6dbf7e6ea762262aed4 IN  Alchemix Finance: alUSD Token0 ETH0.0000022140680.030484594
0x858bbbfd8b9c0e573949a35909ec93e01e807dfed88fc782b2d007f6689b87edApprove1180526742024-03-29 9:22:053 hrs 8 mins ago0xcb9055fc2a8f0f27041dc238574100a22df0c15e IN  Alchemix Finance: alUSD Token0 ETH0.0000023848310.0312932
0xf90196c1c4d5f8054226578393676ba3c80b859fcaf6aaa8bd2be935b3574caaApprove1180525512024-03-29 9:17:593 hrs 12 mins ago0xcb9055fc2a8f0f27041dc238574100a22df0c15e IN  Alchemix Finance: alUSD Token0 ETH0.000002860350.0292
0xd8eed8f430d0b4aa3d30c444381b7af769bcefd212f43f3a636b9ced5dfe49c2Approve1180495692024-03-29 7:38:354 hrs 51 mins ago0x5230f37ae84d9accfc579efe272e5156669ed6b8 IN  Alchemix Finance: alUSD Token0 ETH0.0000030045170.031401399
0xb439d53d1f6f6d5af409c77981e624ab44477334f706431b40a3e1915fe71415Approve1180448142024-03-29 5:00:057 hrs 30 mins ago0x789645a3c66e8988973dc32a52740d017b1ef807 IN  Alchemix Finance: alUSD Token0 ETH0.000003946790.031208053
0xec2bfd8fa5682fe3b2b801d1d978ccf4b3a5a41a3cda68c46510c532ece5038fApprove1180446232024-03-29 4:53:437 hrs 36 mins ago0x789645a3c66e8988973dc32a52740d017b1ef807 IN  Alchemix Finance: alUSD Token0 ETH0.000004658020.030710198
0x6b7228567caac4c8264ed85e8f9ad666aa3539174b38fc8afc919621f7645d53Approve1180440022024-03-29 4:33:017 hrs 57 mins ago0xf5d9cd9bc51a0a59598a5bcd8eb6440002be3e64 IN  Alchemix Finance: alUSD Token0 ETH0.0000036313690.0317502
0x5d67ffed2a84e83f09df1d88c198714df70fb8a546cdb3d8832dfcbfa734204fApprove1180439652024-03-29 4:31:477 hrs 58 mins ago0xf5d9cd9bc51a0a59598a5bcd8eb6440002be3e64 IN  Alchemix Finance: alUSD Token0 ETH0.0000042801940.0312326
0x8341eaa44c58be16a8b451569939400a6d716967f52a7cb45232abfff87cff9dExchange Canonic...1180385912024-03-29 1:32:3910 hrs 57 mins agoCentre: Deployer IN  Alchemix Finance: alUSD Token0 ETH0.0000062430960.0315152
0xbc608cf88021e8784949c12dcf95c79a172549c540f2d3e0fb48d4f67adcf132Approve1180350262024-03-28 23:33:4912 hrs 56 mins ago0x44034e2261ede365b20eb18b109ca3698c19ddc9 IN  Alchemix Finance: alUSD Token0 ETH0.0000053606910.02822724
0xeb482f8a992ff04a3eb7ed2a0b499f1b222f500e2f30d4364a8617afa98bf328Approve1180333792024-03-28 22:38:5513 hrs 51 mins ago0xfcf80133cd4e8d79ddf8125a32980398a0b074d0 IN  Alchemix Finance: alUSD Token0 ETH0.0000031918920.0308629
0x66ddda616ed9310a0da6b0350343ba8f47d9ec8f81b67c9c2500c4236b6c3970Approve1180328262024-03-28 22:20:2914 hrs 9 mins ago0x537e789ec3acb8905233c465d3b111e1ae2e6c5d IN  Alchemix Finance: alUSD Token0 ETH0.0000033243380.0336984
0x180212766a294d30c3ea77cf2a53b9e3a6d8908ce2bd14681592218e122af8ecApprove1180303392024-03-28 20:57:3515 hrs 32 mins ago0xbc037e56e9a3081e6572d18484cf9315a89a0202 IN  Alchemix Finance: alUSD Token0 ETH0.0000022288090.0315574
0x77d7257d426858dab7c81341358f45456b9a4b789a88cc80573fc9bb183a7f02Approve1180299942024-03-28 20:46:0515 hrs 44 mins ago0x8ee2fd0667825f7aaca95db78fceca98070623da IN  Alchemix Finance: alUSD Token0 ETH0.0000029397740.0313269
0xca9407a8925be87234669697f4a0690f2b9d5d1fee0ae6941449aa41064b42fdApprove1180299412024-03-28 20:44:1915 hrs 45 mins ago0x1cf6a0dee17c4eb5fb96f4bb92a514ed7988a6b5 IN  Alchemix Finance: alUSD Token0 ETH0.0000027124960.0315678
0x7da6b1731a8bf0a2fa8a23a406b67669d7051e4bdac30e924b80748024749067Approve1180293722024-03-28 20:25:2116 hrs 4 mins ago0x679e5dcee6ca444d5462fda03be6898208c3a1c6 IN  Alchemix Finance: alUSD Token0 ETH0.0000020051390.032906364
0x14f9b4381c99e40227bf6fc54b154cd2e38a962e16995772eb3296516225d5f5Approve1180293662024-03-28 20:25:0916 hrs 5 mins ago0x679e5dcee6ca444d5462fda03be6898208c3a1c6 IN  Alchemix Finance: alUSD Token0 ETH0.0000025539380.032518355
0x16ec7419ba2fa3a8f81052754b1c3b54d234b2385c9e45e2579e7536a671c017Approve1180272962024-03-28 19:16:0917 hrs 14 mins ago0xae1ea59c25e4c1e4888742987e876f3525b2955d IN  Alchemix Finance: alUSD Token0 ETH0.0000048457260.0215835
0x723f17f5b2b38b1b9cb3f4b8836a138e97e4659e8a1e45f30531c7ddceeed273Approve1180272882024-03-28 19:15:5317 hrs 14 mins ago0xae1ea59c25e4c1e4888742987e876f3525b2955d IN  Alchemix Finance: alUSD Token0 ETH0.0000048601970.0220028
0xfe462a206bbe292da45dbb839579502c62080bac2e5dbc6e3f2bfc8103775c2aApprove1180261592024-03-28 18:38:1517 hrs 51 mins ago0x4d2a353dcd9b25a241382241c9b9a27b7cd08f20 IN  Alchemix Finance: alUSD Token0 ETH0.0000091426560.0295425
0x7f4606fc6730bcdff13b5139cca8c6e46d7b1ba6c9a860732e8685bd23cd0439Approve1180261522024-03-28 18:38:0117 hrs 52 mins ago0x4d2a353dcd9b25a241382241c9b9a27b7cd08f20 IN  Alchemix Finance: alUSD Token0 ETH0.0000097178510.0298164
0x435c67be5484cec58fcef6cbb9f31b884319fc1a4e805b5ff39e3470840d0eacApprove1180260812024-03-28 18:35:3917 hrs 54 mins ago0x4d2a353dcd9b25a241382241c9b9a27b7cd08f20 IN  Alchemix Finance: alUSD Token0 ETH0.0000091650360.0313558
0xaa9c3243036c949b085607865ae6d19dcf86b035bcad162ab5d18e22271c11b0Approve1180243252024-03-28 17:37:0718 hrs 53 mins ago0x063608d16d09e48e46329d6bf833cd31dc341030 IN  Alchemix Finance: alUSD Token0 ETH0.0000067818930.0242239
0x2caa511abfcbacda271facca8d76ae714df35abbe3e2c3ad3ddba80cbc6a0d86Approve1180241882024-03-28 17:32:3318 hrs 57 mins ago0xae1ea59c25e4c1e4888742987e876f3525b2955d IN  Alchemix Finance: alUSD Token0 ETH0.0000058578350.0192308
0x949171e46b19ab3d84e33c9e2fe6ab58212ca40cdb5f00366bae7851657f48b9Approve1180226352024-03-28 16:40:4719 hrs 49 mins ago0x206a14aa83264ccc816bc71e34d807fe558f04d7 IN  Alchemix Finance: alUSD Token0 ETH0.0000082830430.020197651
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OVERVIEW

ALCX is the governance token for the Alchemix protocol.

Latest 25 internal transaction
Parent Txn Hash Block From To Value
0x0d808e5f66255ae93ee2b62fb175b4b8e2958b1b9ac1dcf29afcdb35aaa39d0b1075577312023-07-30 10:50:39243 days 1 hr ago Alchemix Finance: alUSD Token 0x9d4c27802238c96270bd3913e5dbbadba92715e10 ETH
0x0d808e5f66255ae93ee2b62fb175b4b8e2958b1b9ac1dcf29afcdb35aaa39d0b1075577312023-07-30 10:50:39243 days 1 hr ago 0x16e7e0960a74b0ea3e61118a0c0eae8f83d43d7c Alchemix Finance: alUSD Token0 ETH
0x0d808e5f66255ae93ee2b62fb175b4b8e2958b1b9ac1dcf29afcdb35aaa39d0b1075577312023-07-30 10:50:39243 days 1 hr ago Alchemix Finance: alUSD Token 0x9d4c27802238c96270bd3913e5dbbadba92715e10 ETH
0x0d808e5f66255ae93ee2b62fb175b4b8e2958b1b9ac1dcf29afcdb35aaa39d0b1075577312023-07-30 10:50:39243 days 1 hr ago 0x16e7e0960a74b0ea3e61118a0c0eae8f83d43d7c Alchemix Finance: alUSD Token0 ETH
0x0d808e5f66255ae93ee2b62fb175b4b8e2958b1b9ac1dcf29afcdb35aaa39d0b1075577312023-07-30 10:50:39243 days 1 hr ago Alchemix Finance: alUSD Token 0x9d4c27802238c96270bd3913e5dbbadba92715e10 ETH
0x0d808e5f66255ae93ee2b62fb175b4b8e2958b1b9ac1dcf29afcdb35aaa39d0b1075577312023-07-30 10:50:39243 days 1 hr ago 0x16e7e0960a74b0ea3e61118a0c0eae8f83d43d7c Alchemix Finance: alUSD Token0 ETH
0x0d808e5f66255ae93ee2b62fb175b4b8e2958b1b9ac1dcf29afcdb35aaa39d0b1075577312023-07-30 10:50:39243 days 1 hr ago Alchemix Finance: alUSD Token 0x9d4c27802238c96270bd3913e5dbbadba92715e10 ETH
0x0d808e5f66255ae93ee2b62fb175b4b8e2958b1b9ac1dcf29afcdb35aaa39d0b1075577312023-07-30 10:50:39243 days 1 hr ago 0xf3ade441be8c0579ca8d0b05ca33ed35dd90338c Alchemix Finance: alUSD Token0 ETH
0x0d808e5f66255ae93ee2b62fb175b4b8e2958b1b9ac1dcf29afcdb35aaa39d0b1075577312023-07-30 10:50:39243 days 1 hr ago Alchemix Finance: alUSD Token 0x9d4c27802238c96270bd3913e5dbbadba92715e10 ETH
0x0d808e5f66255ae93ee2b62fb175b4b8e2958b1b9ac1dcf29afcdb35aaa39d0b1075577312023-07-30 10:50:39243 days 1 hr ago 0x16e7e0960a74b0ea3e61118a0c0eae8f83d43d7c Alchemix Finance: alUSD Token0 ETH
0x0d808e5f66255ae93ee2b62fb175b4b8e2958b1b9ac1dcf29afcdb35aaa39d0b1075577312023-07-30 10:50:39243 days 1 hr ago Alchemix Finance: alUSD Token 0x9d4c27802238c96270bd3913e5dbbadba92715e10 ETH
0x0d808e5f66255ae93ee2b62fb175b4b8e2958b1b9ac1dcf29afcdb35aaa39d0b1075577312023-07-30 10:50:39243 days 1 hr ago 0x16e7e0960a74b0ea3e61118a0c0eae8f83d43d7c Alchemix Finance: alUSD Token0 ETH
0x0d808e5f66255ae93ee2b62fb175b4b8e2958b1b9ac1dcf29afcdb35aaa39d0b1075577312023-07-30 10:50:39243 days 1 hr ago Alchemix Finance: alUSD Token 0x9d4c27802238c96270bd3913e5dbbadba92715e10 ETH
0x0d808e5f66255ae93ee2b62fb175b4b8e2958b1b9ac1dcf29afcdb35aaa39d0b1075577312023-07-30 10:50:39243 days 1 hr ago 0x16e7e0960a74b0ea3e61118a0c0eae8f83d43d7c Alchemix Finance: alUSD Token0 ETH
0x0d808e5f66255ae93ee2b62fb175b4b8e2958b1b9ac1dcf29afcdb35aaa39d0b1075577312023-07-30 10:50:39243 days 1 hr ago Alchemix Finance: alUSD Token 0x9d4c27802238c96270bd3913e5dbbadba92715e10 ETH
0x0d808e5f66255ae93ee2b62fb175b4b8e2958b1b9ac1dcf29afcdb35aaa39d0b1075577312023-07-30 10:50:39243 days 1 hr ago 0xf3ade441be8c0579ca8d0b05ca33ed35dd90338c Alchemix Finance: alUSD Token0 ETH
0x0d808e5f66255ae93ee2b62fb175b4b8e2958b1b9ac1dcf29afcdb35aaa39d0b1075577312023-07-30 10:50:39243 days 1 hr ago Alchemix Finance: alUSD Token 0x9d4c27802238c96270bd3913e5dbbadba92715e10 ETH
0x0d808e5f66255ae93ee2b62fb175b4b8e2958b1b9ac1dcf29afcdb35aaa39d0b1075577312023-07-30 10:50:39243 days 1 hr ago 0x16e7e0960a74b0ea3e61118a0c0eae8f83d43d7c Alchemix Finance: alUSD Token0 ETH
0x0d808e5f66255ae93ee2b62fb175b4b8e2958b1b9ac1dcf29afcdb35aaa39d0b1075577312023-07-30 10:50:39243 days 1 hr ago Alchemix Finance: alUSD Token 0x9d4c27802238c96270bd3913e5dbbadba92715e10 ETH
0x0d808e5f66255ae93ee2b62fb175b4b8e2958b1b9ac1dcf29afcdb35aaa39d0b1075577312023-07-30 10:50:39243 days 1 hr ago 0x16e7e0960a74b0ea3e61118a0c0eae8f83d43d7c Alchemix Finance: alUSD Token0 ETH
0x0d808e5f66255ae93ee2b62fb175b4b8e2958b1b9ac1dcf29afcdb35aaa39d0b1075577312023-07-30 10:50:39243 days 1 hr ago Alchemix Finance: alUSD Token 0x9d4c27802238c96270bd3913e5dbbadba92715e10 ETH
0x0d808e5f66255ae93ee2b62fb175b4b8e2958b1b9ac1dcf29afcdb35aaa39d0b1075577312023-07-30 10:50:39243 days 1 hr ago 0x16e7e0960a74b0ea3e61118a0c0eae8f83d43d7c Alchemix Finance: alUSD Token0 ETH
0x0d808e5f66255ae93ee2b62fb175b4b8e2958b1b9ac1dcf29afcdb35aaa39d0b1075577312023-07-30 10:50:39243 days 1 hr ago Alchemix Finance: alUSD Token 0x9d4c27802238c96270bd3913e5dbbadba92715e10 ETH
0x0d808e5f66255ae93ee2b62fb175b4b8e2958b1b9ac1dcf29afcdb35aaa39d0b1075577312023-07-30 10:50:39243 days 1 hr ago 0xf3ade441be8c0579ca8d0b05ca33ed35dd90338c Alchemix Finance: alUSD Token0 ETH
0xe12a5af6a5eaf5be12e49aa4a7d40baf79c0b5569ec2f983aeae51dd1d56dee21075577002023-07-30 10:49:37243 days 1 hr ago Alchemix Finance: alUSD Token 0x9d4c27802238c96270bd3913e5dbbadba92715e10 ETH
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Similar Match Source Code
This contract matches the deployed Bytecode of the Source Code for Contract 0xf18D727C034f47AE2C0FE221C1cf4A15f0557b5F
The constructor portion of the code might be different and could alter the actual behaviour of the contract

Contract Name:
TransparentUpgradeableProxy

Compiler Version
v0.8.2+commit.661d1103

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion, MIT license

Contract Source Code (Solidity)

/**
 *Submitted for verification at Optimistic.Etherscan.io on 2021-11-13
*/

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev Library for reading and writing primitive types to specific storage slots.
 *
 * Storage slots are often used to avoid storage conflict when dealing with upgradeable contracts.
 * This library helps with reading and writing to such slots without the need for inline assembly.
 *
 * The functions in this library return Slot structs that contain a `value` member that can be used to read or write.
 *
 * Example usage to set ERC1967 implementation slot:
 * ```
 * contract ERC1967 {
 *     bytes32 internal constant _IMPLEMENTATION_SLOT = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;
 *
 *     function _getImplementation() internal view returns (address) {
 *         return StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value;
 *     }
 *
 *     function _setImplementation(address newImplementation) internal {
 *         require(Address.isContract(newImplementation), "ERC1967: new implementation is not a contract");
 *         StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value = newImplementation;
 *     }
 * }
 * ```
 *
 * _Available since v4.1 for `address`, `bool`, `bytes32`, and `uint256`._
 */
library StorageSlot {
    struct AddressSlot {
        address value;
    }

    struct BooleanSlot {
        bool value;
    }

    struct Bytes32Slot {
        bytes32 value;
    }

    struct Uint256Slot {
        uint256 value;
    }

    /**
     * @dev Returns an `AddressSlot` with member `value` located at `slot`.
     */
    function getAddressSlot(bytes32 slot) internal pure returns (AddressSlot storage r) {
        assembly {
            r.slot := slot
        }
    }

    /**
     * @dev Returns an `BooleanSlot` with member `value` located at `slot`.
     */
    function getBooleanSlot(bytes32 slot) internal pure returns (BooleanSlot storage r) {
        assembly {
            r.slot := slot
        }
    }

    /**
     * @dev Returns an `Bytes32Slot` with member `value` located at `slot`.
     */
    function getBytes32Slot(bytes32 slot) internal pure returns (Bytes32Slot storage r) {
        assembly {
            r.slot := slot
        }
    }

    /**
     * @dev Returns an `Uint256Slot` with member `value` located at `slot`.
     */
    function getUint256Slot(bytes32 slot) internal pure returns (Uint256Slot storage r) {
        assembly {
            r.slot := slot
        }
    }
}

/**
 * @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) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        // solhint-disable-next-line no-inline-assembly
        assembly { size := extcodesize(account) }
        return size > 0;
    }

    /**
     * @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");
        require(isContract(target), "Address: call to non-contract");

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

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data, string memory errorMessage) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.staticcall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private pure returns(bytes memory) {
        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);
            }
        }
    }
}

/**
 * @dev This is the interface that {BeaconProxy} expects of its beacon.
 */
interface IBeacon {
    /**
     * @dev Must return an address that can be used as a delegate call target.
     *
     * {BeaconProxy} will check that this address is a contract.
     */
    function implementation() external view returns (address);
}

/**
 * @dev This abstract contract provides getters and event emitting update functions for
 * https://eips.ethereum.org/EIPS/eip-1967[EIP1967] slots.
 *
 * _Available since v4.1._
 *
 * @custom:oz-upgrades-unsafe-allow delegatecall
 */
abstract contract ERC1967Upgrade {
    // This is the keccak-256 hash of "eip1967.proxy.rollback" subtracted by 1
    bytes32 private constant _ROLLBACK_SLOT = 0x4910fdfa16fed3260ed0e7147f7cc6da11a60208b5b9406d12a635614ffd9143;

    /**
     * @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 internal constant _IMPLEMENTATION_SLOT = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;

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

    /**
     * @dev Returns the current implementation address.
     */
    function _getImplementation() internal view returns (address) {
        return StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value;
    }

    /**
     * @dev Stores a new address in the EIP1967 implementation slot.
     */
    function _setImplementation(address newImplementation) private {
        require(Address.isContract(newImplementation), "ERC1967: new implementation is not a contract");
        StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value = newImplementation;
    }

    /**
     * @dev Perform implementation upgrade
     *
     * Emits an {Upgraded} event.
     */
    function _upgradeTo(address newImplementation) internal {
        _setImplementation(newImplementation);
        emit Upgraded(newImplementation);
    }

    /**
     * @dev Perform implementation upgrade with additional setup call.
     *
     * Emits an {Upgraded} event.
     */
    function _upgradeToAndCall(address newImplementation, bytes memory data, bool forceCall) internal {
        _setImplementation(newImplementation);
        emit Upgraded(newImplementation);
        if (data.length > 0 || forceCall) {
            Address.functionDelegateCall(newImplementation, data);
        }
    }

    /**
     * @dev Perform implementation upgrade with security checks for UUPS proxies, and additional setup call.
     *
     * Emits an {Upgraded} event.
     */
    function _upgradeToAndCallSecure(address newImplementation, bytes memory data, bool forceCall) internal {
        address oldImplementation = _getImplementation();

        // Initial upgrade and setup call
        _setImplementation(newImplementation);
        if (data.length > 0 || forceCall) {
            Address.functionDelegateCall(newImplementation, data);
        }

        // Perform rollback test if not already in progress
        StorageSlot.BooleanSlot storage rollbackTesting = StorageSlot.getBooleanSlot(_ROLLBACK_SLOT);
        if (!rollbackTesting.value) {
            // Trigger rollback using upgradeTo from the new implementation
            rollbackTesting.value = true;
            Address.functionDelegateCall(
                newImplementation,
                abi.encodeWithSignature(
                    "upgradeTo(address)",
                    oldImplementation
                )
            );
            rollbackTesting.value = false;
            // Check rollback was effective
            require(oldImplementation == _getImplementation(), "ERC1967Upgrade: upgrade breaks further upgrades");
            // Finally reset to the new implementation and log the upgrade
            _setImplementation(newImplementation);
            emit Upgraded(newImplementation);
        }
    }

    /**
     * @dev Perform beacon upgrade with additional setup call. Note: This upgrades the address of the beacon, it does
     * not upgrade the implementation contained in the beacon (see {UpgradeableBeacon-_setImplementation} for that).
     *
     * Emits a {BeaconUpgraded} event.
     */
    function _upgradeBeaconToAndCall(address newBeacon, bytes memory data, bool forceCall) internal {
        _setBeacon(newBeacon);
        emit BeaconUpgraded(newBeacon);
        if (data.length > 0 || forceCall) {
            Address.functionDelegateCall(IBeacon(newBeacon).implementation(), data);
        }
    }

    /**
     * @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 internal constant _ADMIN_SLOT = 0xb53127684a568b3173ae13b9f8a6016e243e63b6e8ee1178d6a717850b5d6103;

    /**
     * @dev Emitted when the admin account has changed.
     */
    event AdminChanged(address previousAdmin, address newAdmin);

    /**
     * @dev Returns the current admin.
     */
    function _getAdmin() internal view returns (address) {
        return StorageSlot.getAddressSlot(_ADMIN_SLOT).value;
    }

    /**
     * @dev Stores a new address in the EIP1967 admin slot.
     */
    function _setAdmin(address newAdmin) private {
        require(newAdmin != address(0), "ERC1967: new admin is the zero address");
        StorageSlot.getAddressSlot(_ADMIN_SLOT).value = newAdmin;
    }

    /**
     * @dev Changes the admin of the proxy.
     *
     * Emits an {AdminChanged} event.
     */
    function _changeAdmin(address newAdmin) internal {
        emit AdminChanged(_getAdmin(), newAdmin);
        _setAdmin(newAdmin);
    }

    /**
     * @dev The storage slot of the UpgradeableBeacon contract which defines the implementation for this proxy.
     * This is bytes32(uint256(keccak256('eip1967.proxy.beacon')) - 1)) and is validated in the constructor.
     */
    bytes32 internal constant _BEACON_SLOT = 0xa3f0ad74e5423aebfd80d3ef4346578335a9a72aeaee59ff6cb3582b35133d50;

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

    /**
     * @dev Returns the current beacon.
     */
    function _getBeacon() internal view returns (address) {
        return StorageSlot.getAddressSlot(_BEACON_SLOT).value;
    }

    /**
     * @dev Stores a new beacon in the EIP1967 beacon slot.
     */
    function _setBeacon(address newBeacon) private {
        require(
            Address.isContract(newBeacon),
            "ERC1967: new beacon is not a contract"
        );
        require(
            Address.isContract(IBeacon(newBeacon).implementation()),
            "ERC1967: beacon implementation is not a contract"
        );
        StorageSlot.getAddressSlot(_BEACON_SLOT).value = newBeacon;
    }
}

/**
 * @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 virtual {
        // 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 view virtual 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 virtual {
        _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 () external payable virtual {
        _fallback();
    }

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

/**
 * @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.
 */
contract ERC1967Proxy is Proxy, ERC1967Upgrade {
    /**
     * @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));
        _upgradeToAndCall(_logic, _data, false);
    }

    /**
     * @dev Returns the current implementation address.
     */
    function _implementation() internal view virtual override returns (address impl) {
        return ERC1967Upgrade._getImplementation();
    }
}

/**
 * @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 interface of your proxy.
 */
contract TransparentUpgradeableProxy is ERC1967Proxy {
    /**
     * @dev Initializes an upgradeable proxy managed by `_admin`, backed by the implementation at `_logic`, and
     * optionally initialized with `_data` as explained in {ERC1967Proxy-constructor}.
     */
    constructor(address _logic, address admin_, bytes memory _data) payable ERC1967Proxy(_logic, _data) {
        assert(_ADMIN_SLOT == bytes32(uint256(keccak256("eip1967.proxy.admin")) - 1));
        _changeAdmin(admin_);
    }

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

    /**
     * @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 implementation_) {
        implementation_ = _implementation();
    }

    /**
     * @dev Changes the admin of the proxy.
     *
     * Emits an {AdminChanged} event.
     *
     * NOTE: Only the admin can call this function. See {ProxyAdmin-changeProxyAdmin}.
     */
    function changeAdmin(address newAdmin) external virtual ifAdmin {
        _changeAdmin(newAdmin);
    }

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

    /**
     * @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 {
        _upgradeToAndCall(newImplementation, data, true);
    }

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

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

Contract Security Audit

Contract ABI

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Deployed Bytecode

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Deployed ByteCode Sourcemap

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Swarm Source

ipfs://93f028255035b61df476b13b9dba3c4f06f60e51b9b4caee31680b389aef327f
Block Transaction Difficulty Gas Used Reward
Block Uncle Number Difficulty Gas Used Reward
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