Contract 0x57c7e0d43c05bce429ce030132ca40f6fa5839d7

 

Contract Overview

Lemma Finance: xUSDL
Balance:
0 ETH

ETH Value:
$0.00

Token:
Txn Hash Method
Block
From
To
Value [Txn Fee]
0x88fd72c4605741fd2f65de0378aad01d51c5f512b8e5c196f33f92c4de06e985Approve258483242022-09-22 2:18:095 days 15 hrs ago0x0cd436e6585fcf8c78aae43db32e11d2e3711dec IN  Lemma Finance: xUSDL0 ETH0.00403008
0x0b53b9ed56bdf1f3f3c9a78561f9e60cc7a3289a6c14b08fe202c71010e85179Approve258479942022-09-22 2:15:555 days 15 hrs ago0x4af25d499ea9b3d064e1940258e9aac272ca8d74 IN  Lemma Finance: xUSDL0 ETH0.00406356
0x671b302e6566a83b0add88a38ce913b47fa0d7005b0fa0cc404a244a25a171e2Approve252598972022-09-19 10:25:078 days 6 hrs ago0x0f3bf5c241b6625c0fa781ed137fde6786b2e66f IN  Lemma Finance: xUSDL0 ETH0.00000726
0xd7391857836dda0659f51ed5828437d3e5f1d161c7fd2ad3e727d1bdea83a98fApprove239813342022-09-10 18:38:4616 days 22 hrs ago0xf7476db5b717ac661c027e684456115ab1e728c3 IN  Lemma Finance: xUSDL0 ETH0.0000193
0x3ab3523867e9ab5c47d348d304195d37a9d05d03c9872211ae36838c29760b2bApprove226639962022-09-03 15:15:3824 days 2 hrs ago0x4e8efa766f63906b008a11e3bf4afa6e96892c5e IN  Lemma Finance: xUSDL0 ETH0.00020192
0xb9c1681de39dcbd0de0324ef9ae7ee172fffa75c117e5df291046ef769b8cf94Approve217768092022-08-29 1:56:3929 days 15 hrs ago0x31c9e8711f59f6c913a7da95741de3539fe64bcd IN  Lemma Finance: xUSDL0 ETH0.000084750147 ETH
0xe409212d0b29e2b89103e506ddd6c1a1d30e03deeb38b5b57dcfc98de39c295eApprove210543672022-08-23 13:17:1335 days 4 hrs ago0xa4e9ed42daa6a51927f19aaa9389c459351cac27 IN  Lemma Finance: xUSDL0 ETH0.00006884963 ETH
0x4c8524b7e3413864a555539945180a2db42d8bf2e498f81ad9dce32896a41992Approve197467712022-08-08 19:46:2249 days 21 hrs ago0xa95d252193c0c433dbba11e9aa1cfc5481f4ac36 IN  Lemma Finance: xUSDL0 ETH0.000102670891 ETH
0xabb238ed52516e9511c9612886e6e01385618be014d4d77b0237588d3fd35facApprove185889792022-07-26 5:22:0063 days 11 hrs ago0xca2a58f421c027e98d41bcb8c4ae019f610dd000 IN  Lemma Finance: xUSDL0 ETH0.000164498603 ETH
0xba97559c58a7bc42ed4f8fbc743727449542ce17ddb69d79da850d37396f6b4eApprove182460952022-07-22 0:03:3467 days 17 hrs ago0x78d8e8807f652b54afe33b7645a26c5ffae5291c IN  Lemma Finance: xUSDL0 ETH0.000134623392 ETH
0x9514062c93d50aaba838a216bf80806b02c5584df3e7f6d6f57703421b494bf6Approve176117542022-07-14 9:54:4175 days 7 hrs ago0x83b23e8e5da74fd3f3e5471865fc778d9c843df0 IN  Lemma Finance: xUSDL0 ETH0.000134015836 ETH
0xed4576710a694b96158e943cb1cb0231410020d4cc087f2291930cee95b55c2eApprove171323012022-07-06 15:32:2083 days 1 hr ago0xf7476db5b717ac661c027e684456115ab1e728c3 IN  Lemma Finance: xUSDL0 ETH0.000134091252 ETH
0x1386b17bc29437348e9f875e7196d2823e0ed5d4fa7cc2c573dba501e56ef355Approve163899072022-06-29 8:15:3490 days 9 hrs ago0xbef716e7fbc844020925dc372879becd2f932bf9 IN  Lemma Finance: xUSDL0 ETH0.000444785978 ETH
0x7dd74a029a304e5953767ff067913effe6cbd39bd5d2b3caead84f43e16f7a5bApprove151851992022-06-20 17:31:4098 days 23 hrs ago0xf235e752c13095df7826f48fffcaab372998cbeb IN  Lemma Finance: xUSDL0 ETH0.00017645704 ETH
0xa0f878e723b230ba0470d0ca77c936c3de7d54c4ce0989f8f482dcd240d4486bApprove150213222022-06-18 19:53:53100 days 21 hrs ago0x7c4fff6ec3dd128dec8fb60bd0ad5fb4e689e72e IN  Lemma Finance: xUSDL0 ETH0.000270634431 ETH
0xb4008622a89de559ffbe0747d67da8b7b0b484ffab4e4c61a50251cb0721f723Approve150210222022-06-18 19:49:00100 days 21 hrs ago0x949f72c57465028ea7838f4673c1d39c9039daf0 IN  Lemma Finance: xUSDL0 ETH0.000270631112 ETH
0xa5bb78e94b059d106b773bae799320ac371646ff78a8db45bff847286891d926Approve134806972022-06-02 2:21:57117 days 14 hrs ago0xcc52d4132a0fd28a6e2e820d0c8e774fe53499f0 IN  Lemma Finance: xUSDL0 ETH0.000287203584 ETH
0x066ad82d8731a86b6c473142a77e91e8b09441372c24df3f68968cee7e3ee81cApprove127281972022-05-22 18:44:30127 days 22 hrs ago0x43a60df4d280c1c6b10718ee95fca9f44ae189d6 IN  Lemma Finance: xUSDL0 ETH0.000144530485 ETH
0x22c3a3df5836fea06165b300a8b92dbfa25fbd6d9744a2b1236dc745d2010526Approve120591842022-05-14 14:08:53136 days 3 hrs ago0x537bf75de19f3d229e3a9018ee1a23c0c9c7d39c IN  Lemma Finance: xUSDL0 ETH0.00027099211 ETH
0x642263b08c72ef7b8d3713d8f6f665b283fd350fb0da999aa80648e28e2ebb1aApprove120567802022-05-14 13:43:52136 days 3 hrs ago0x5fd7d6382de0d4c4a00b19ed10c11dfd96c27340 IN  Lemma Finance: xUSDL0 ETH0.00027164722 ETH
0x8e23d4f294e34927667eaa481871260fc5272b6bfc9e6a25808c8c608d5ffd00Approve119026752022-05-12 11:50:13138 days 5 hrs ago0x54edecbf2af3aab2dd62e560e35653f08d5c23b4 IN  Lemma Finance: xUSDL0 ETH0.00201276802 ETH
0x18b93f49b1958dc2391b0b04781e3cd70fa702b8af077d66d0aab918ed7acd1cApprove118002532022-05-11 13:40:49139 days 3 hrs ago0x98c0448e5b133cf2f3722fa8d2fbb371bcd8e43a IN  Lemma Finance: xUSDL0 ETH0.000343737781 ETH
0x3e4096140224afe8dc89cb78b308c9495e9b088e143d90595b2175a20a919bb2Transfer107349842022-04-28 11:32:08152 days 5 hrs ago0xb6e34a8a93031a24c264be59d0bac00bcaef9051 IN  Lemma Finance: xUSDL0 ETH0.000246870242 ETH
0xa548148fc115b941759e0fa69fdfa3b794fc6e4a94444c76769cfee10622b78dTransfer94355012022-04-07 6:18:15173 days 11 hrs ago0x4707ddf20584a1df862403e7e0cc77c33330dca0 IN  Lemma Finance: xUSDL0 ETH0.000349356656 ETH
0x949008400bfc4a75eef217e8a9525fb764906c8f4f66f266adae9775a5e3fc12Approve89888522022-03-31 17:57:16179 days 23 hrs ago0x91a9b4da163a1f248c92dbd262ad3e95e042c87e IN  Lemma Finance: xUSDL0 ETH0.000296546301 ETH
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Latest 25 internal transaction
Parent Txn Hash Block From To Value
0x8dea669aec9629c908dd319208280f1332096eb4abf8057182627d673b2e237a262057292022-09-23 14:31:514 days 2 hrs ago Lemma Finance: xUSDL Lemma Finance: USD Lemma0 ETH
0x8dea669aec9629c908dd319208280f1332096eb4abf8057182627d673b2e237a262057292022-09-23 14:31:514 days 2 hrs ago Lemma Finance: xUSDL Lemma Finance: USD Lemma0 ETH
0x8dea669aec9629c908dd319208280f1332096eb4abf8057182627d673b2e237a262057292022-09-23 14:31:514 days 2 hrs ago Lemma Finance: xUSDL 0x566ea349158b610d1800cb9ec3072931140cbf030 ETH
0x8dea669aec9629c908dd319208280f1332096eb4abf8057182627d673b2e237a262057292022-09-23 14:31:514 days 2 hrs ago 0xebacd923ddf988140898469048a9c1d8b8ccb3c3 Lemma Finance: xUSDL0 ETH
0x8dea669aec9629c908dd319208280f1332096eb4abf8057182627d673b2e237a262057292022-09-23 14:31:514 days 2 hrs ago Lemma Finance: xUSDL 0x566ea349158b610d1800cb9ec3072931140cbf030 ETH
0x8dea669aec9629c908dd319208280f1332096eb4abf8057182627d673b2e237a262057292022-09-23 14:31:514 days 2 hrs ago 0xebacd923ddf988140898469048a9c1d8b8ccb3c3 Lemma Finance: xUSDL0 ETH
0x3068587ddb928e46907b3bd5797d38f0884448f985841bf3184f35982520e153258484102022-09-22 2:18:395 days 15 hrs ago Lemma Finance: xUSDL Lemma Finance: USD Lemma0 ETH
0x3068587ddb928e46907b3bd5797d38f0884448f985841bf3184f35982520e153258484102022-09-22 2:18:395 days 15 hrs ago Lemma Finance: xUSDL Lemma Finance: USD Lemma0 ETH
0x3068587ddb928e46907b3bd5797d38f0884448f985841bf3184f35982520e153258484102022-09-22 2:18:395 days 15 hrs ago Lemma Finance: xUSDL 0x566ea349158b610d1800cb9ec3072931140cbf030 ETH
0x3068587ddb928e46907b3bd5797d38f0884448f985841bf3184f35982520e153258484102022-09-22 2:18:395 days 15 hrs ago 0xebacd923ddf988140898469048a9c1d8b8ccb3c3 Lemma Finance: xUSDL0 ETH
0x3068587ddb928e46907b3bd5797d38f0884448f985841bf3184f35982520e153258484102022-09-22 2:18:395 days 15 hrs ago Lemma Finance: xUSDL 0x566ea349158b610d1800cb9ec3072931140cbf030 ETH
0x3068587ddb928e46907b3bd5797d38f0884448f985841bf3184f35982520e153258484102022-09-22 2:18:395 days 15 hrs ago 0xebacd923ddf988140898469048a9c1d8b8ccb3c3 Lemma Finance: xUSDL0 ETH
0x88fd72c4605741fd2f65de0378aad01d51c5f512b8e5c196f33f92c4de06e985258483242022-09-22 2:18:095 days 15 hrs ago Lemma Finance: xUSDL 0x566ea349158b610d1800cb9ec3072931140cbf030 ETH
0x84d26c5db9c17644b13dfe416295266a63d6c1ec2634dfa9dc8706b9415d787e258480352022-09-22 2:16:145 days 15 hrs ago Lemma Finance: xUSDL Lemma Finance: USD Lemma0 ETH
0x84d26c5db9c17644b13dfe416295266a63d6c1ec2634dfa9dc8706b9415d787e258480352022-09-22 2:16:145 days 15 hrs ago Lemma Finance: xUSDL Lemma Finance: USD Lemma0 ETH
0x84d26c5db9c17644b13dfe416295266a63d6c1ec2634dfa9dc8706b9415d787e258480352022-09-22 2:16:145 days 15 hrs ago Lemma Finance: xUSDL 0x566ea349158b610d1800cb9ec3072931140cbf030 ETH
0x84d26c5db9c17644b13dfe416295266a63d6c1ec2634dfa9dc8706b9415d787e258480352022-09-22 2:16:145 days 15 hrs ago 0xebacd923ddf988140898469048a9c1d8b8ccb3c3 Lemma Finance: xUSDL0 ETH
0x84d26c5db9c17644b13dfe416295266a63d6c1ec2634dfa9dc8706b9415d787e258480352022-09-22 2:16:145 days 15 hrs ago Lemma Finance: xUSDL 0x566ea349158b610d1800cb9ec3072931140cbf030 ETH
0x84d26c5db9c17644b13dfe416295266a63d6c1ec2634dfa9dc8706b9415d787e258480352022-09-22 2:16:145 days 15 hrs ago 0xebacd923ddf988140898469048a9c1d8b8ccb3c3 Lemma Finance: xUSDL0 ETH
0x0b53b9ed56bdf1f3f3c9a78561f9e60cc7a3289a6c14b08fe202c71010e85179258479942022-09-22 2:15:555 days 15 hrs ago Lemma Finance: xUSDL 0x566ea349158b610d1800cb9ec3072931140cbf030 ETH
0xee86a203addfd604f32bfa34260eb5d92b8cc933bc7acefcc26d0642f9f3eaf0252599652022-09-19 10:25:438 days 6 hrs ago Lemma Finance: xUSDL Lemma Finance: USD Lemma0 ETH
0xee86a203addfd604f32bfa34260eb5d92b8cc933bc7acefcc26d0642f9f3eaf0252599652022-09-19 10:25:438 days 6 hrs ago Lemma Finance: xUSDL Lemma Finance: USD Lemma0 ETH
0xee86a203addfd604f32bfa34260eb5d92b8cc933bc7acefcc26d0642f9f3eaf0252599652022-09-19 10:25:438 days 6 hrs ago Lemma Finance: xUSDL 0x566ea349158b610d1800cb9ec3072931140cbf030 ETH
0xee86a203addfd604f32bfa34260eb5d92b8cc933bc7acefcc26d0642f9f3eaf0252599652022-09-19 10:25:438 days 6 hrs ago 0xebacd923ddf988140898469048a9c1d8b8ccb3c3 Lemma Finance: xUSDL0 ETH
0xee86a203addfd604f32bfa34260eb5d92b8cc933bc7acefcc26d0642f9f3eaf0252599652022-09-19 10:25:438 days 6 hrs ago Lemma Finance: xUSDL 0x566ea349158b610d1800cb9ec3072931140cbf030 ETH
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Similar Match Source Code
Note: This contract matches the deployed ByteCode of the Source Code for Contract 0x3393cD223f59F32CC0cC845DE938472595cA48a1

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 Arbiscan on 2021-08-30
*/

// 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 ABI

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Metadata Hash

93f028255035b61df476b13b9dba3c4f06f60e51b9b4caee31680b389aef327f
Block Transaction Gas Used Reward
Age Block Fee Address BC Fee Address Voting Power Jailed Incoming
Block Uncle Number Difficulty Gas Used Reward
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