Contract 0x78650b139471520656b9e7aa7a5e9276814a38e9

 

Contract Overview

Bitcoin Standard Hashrate: BTCST Token
Balance:
0 BNB

BNB Value:
$0.00

Token:
Txn Hash
Block
From
To
Value [Txn Fee]
0x696b2d3d47ef98864f36d1aa85f9f4c477ae32d7e5ccb9237f68786b936a97b682860692021-06-14 9:19:317 mins ago0xc790e9291b4240d879df81008caf5ff393ccf24c IN  Bitcoin Standard Hashrate: BTCST Token0 BNB0.000236155
0xe814dc7f85d251fc5eb3b7d16bd19630365fef7e124b489440e7925af7a3dfc182860092021-06-14 9:16:2310 mins agoBinance: Hot Wallet 7 IN  Bitcoin Standard Hashrate: BTCST Token0 BNB0.00062149
0xa877c0f0984750c3effcc5856517787ed09c59e347a4bacca257b902a19fa9e782859692021-06-14 9:14:2312 mins agoBinance: Hot Wallet 6 IN  Bitcoin Standard Hashrate: BTCST Token0 BNB0.00062149
0xca7359fba6a97e98ffc07bc4886c02c986f57ef069eb78e55a64ab7cba076ce482858062021-06-14 9:05:2421 mins ago0x6b4b531aa0d19ef5fbae62c64ba41647a63ab201 IN  Bitcoin Standard Hashrate: BTCST Token0 BNB0.000235685
0x66a089f71f57d5f6fa32812ee1df19dcee02874afe67d91e163666ca70205d8782857142021-06-14 9:00:3326 mins ago0x95befe319abee71f51683e9cdb269e1a35180775 IN  Bitcoin Standard Hashrate: BTCST Token0 BNB0.000235805
0xcbf43cac84c4bea43af61790f0d82cd2a55af32cad80cd7984290e58278d587e82854532021-06-14 8:47:1640 mins ago0x6aca1cb651fb9d1a207b2a279ced05480185aa52 IN  Bitcoin Standard Hashrate: BTCST Token0 BNB0.000160745
0xc2761c1627bb60f53e5c8d05f8fe5388138168356539dae59adaf19a773a00a982854522021-06-14 8:47:1340 mins ago0xf4a6d62a53283bf4076416e79c5f04c9d75a7216 IN  Bitcoin Standard Hashrate: BTCST Token0 BNB0.000160805
0x1661d3006ac11c4c23c0e4f03ae2beb1d960fa19db35b1cf3dad1d5a3fb8f16d82854352021-06-14 8:46:2040 mins agoBinance: Hot Wallet 7 IN  Bitcoin Standard Hashrate: BTCST Token0 BNB0.00047137
0xdc990220c65e2685ee80ae39bdb8789a9a6a564600ffc827f89c702e8943bf9f82854112021-06-14 8:44:5842 mins ago0x6a1fa8fe0cf859054661b4da4ee2b28f1bf48077 IN  Bitcoin Standard Hashrate: BTCST Token0 BNB0.000235685
0x74d3abaec7eff60b65d0601e573fa832158b28104eb0a7b2b1a245847a6a5a9782853932021-06-14 8:44:0143 mins ago0x1d22646d71a5ff7113540ee4e99cb189cd207f44 IN  Bitcoin Standard Hashrate: BTCST Token0 BNB0.000160745
0x2ce6c4c811ac14916475149b39a1b5cbf594244a648aeadc91b9ab6f640fb79c82853922021-06-14 8:43:5843 mins ago0x88344a88dd7b31ee7fc92454576d38b710917d56 IN  Bitcoin Standard Hashrate: BTCST Token0 BNB0.000236155
0x70ae3b3295a89f28759fb3b9c1d15957a3beec378973e754b2a735d68adc4d8682853192021-06-14 8:40:1946 mins agoBinance: Hot Wallet 6 IN  Bitcoin Standard Hashrate: BTCST Token0 BNB0.00062149
0xeaf1c7078f8ca5e6b204329ee87bb0a94d6ac3276af95c1ae97675c2cd296e5182851602021-06-14 8:32:2054 mins agoBinance: Hot Wallet 7 IN  Bitcoin Standard Hashrate: BTCST Token0 BNB0.00047149
0x9a11c5657debf03e7c8322bb2599557aaeda99cc52fbb908163151ad63888b4382848122021-06-14 8:14:561 hr 12 mins ago0x53deaeb104cf06a1f44b027bd9fdcbc307fd8a19 IN  Bitcoin Standard Hashrate: BTCST Token0 BNB0.000235685
0x8ff066463293d79cf0ad8e949227ac40398cb5b31e13cc212730350cb49083c082847612021-06-14 8:12:231 hr 14 mins agoBinance: Hot Wallet 6 IN  Bitcoin Standard Hashrate: BTCST Token0 BNB0.00062149
0xf981af45cbf7bb6e79a6cb1f2e784a712f576e1469599194d258b8c0988b77b882847202021-06-14 8:10:201 hr 16 mins agoBinance: Hot Wallet 7 IN  Bitcoin Standard Hashrate: BTCST Token0 BNB0.00047149
0x85385f10ab59a4712769968d8e0890f9bf058947b2258b69016574faef51f06c82846422021-06-14 8:06:261 hr 20 mins ago0x5fa14270c772a99f956f49e5b10fee39d0550d3d IN  Bitcoin Standard Hashrate: BTCST Token0 BNB0.00124322
0x886df42fe158ee42f47c70d01138bb0cce4775ed79729371539058eb2ceb5a9082846222021-06-14 8:05:261 hr 21 mins ago0x0af672ade909ee225236081a7685232e74d78b72 IN  Bitcoin Standard Hashrate: BTCST Token0 BNB0.000282966
0x23f9a53d4af69c697c450ccf8056ffe89952a3a07b25c77b75bf375cc68b525f82845412021-06-14 8:01:231 hr 25 mins ago0xce2a50226ec33a0320e2a1bde5f6e504cd27a91d IN  Bitcoin Standard Hashrate: BTCST Token0 BNB0.000236155
0x8390ab3384ea29281bdeb2542401a554401751448957f4c19abe5cc07f83c3cd82845242021-06-14 8:00:321 hr 26 mins ago0xf4a6d62a53283bf4076416e79c5f04c9d75a7216 IN  Bitcoin Standard Hashrate: BTCST Token0 BNB0.000160865
0xfd2c5dc8cb23e8863438077bef2982ddd8a869bcdd8d342613579e38a712ffc382845212021-06-14 8:00:231 hr 26 mins agoBinance: Hot Wallet 6 IN  Bitcoin Standard Hashrate: BTCST Token0 BNB0.00062137
0x00d3b54845526e657dbf191fa3f5ae2f9712e7ff4caa8caaa0e47a9bbcef011c82845162021-06-14 8:00:081 hr 27 mins ago0x97d349329ff44b568b741b245872d60f535395dd IN  Bitcoin Standard Hashrate: BTCST Token0 BNB0.000160745
0xdeb5f58e17b7c4319900930340a0924f627bacdd9becf3b28fe34d169784346182845002021-06-14 7:59:201 hr 27 mins ago0x33db63539a6484df5b20f2eaab36bc91d824a41e IN  Bitcoin Standard Hashrate: BTCST Token0 BNB0.000236155
0xb07eddb8446ef61471770e5c05824ced94b720476d3c24a84f9da5e70575086082844872021-06-14 7:58:411 hr 28 mins ago0x24742d61c35594d745212b5bfcb76c3db1bc568c IN  Bitcoin Standard Hashrate: BTCST Token0 BNB0.000310685
0x7eeff9f9b1c094fc71701c88e75c373478e80da8ed89b290562f797c569687ac82844802021-06-14 7:58:201 hr 28 mins agoBinance: Hot Wallet 7 IN  Bitcoin Standard Hashrate: BTCST Token0 BNB0.00062137
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OVERVIEW

Bitcoin Standard Hashrate Token (BTCST) brings exchange-grade liquidity to Bitcoin mining. Each BTCST is collateralized by real Bitcoin mining power.

Latest 25 internal transaction
Parent Txn Hash Block From To Value
0x6c233568521e72c93c148aad99b93972d483e2a9c6168e62efa017f8e225b61d54712782021-03-07 11:56:5198 days 21 hrs ago Bitcoin Standard Hashrate: BTCST Token Bitcoin Standard Hashrate: Implementation0 BNB
0x6c233568521e72c93c148aad99b93972d483e2a9c6168e62efa017f8e225b61d54712782021-03-07 11:56:5198 days 21 hrs ago 0x216944baf1182e49252223e78b783fe7d5a02223 Bitcoin Standard Hashrate: BTCST Token0 BNB
0x6c233568521e72c93c148aad99b93972d483e2a9c6168e62efa017f8e225b61d54712782021-03-07 11:56:5198 days 21 hrs ago Bitcoin Standard Hashrate: BTCST Token Bitcoin Standard Hashrate: Implementation0 BNB
0x6c233568521e72c93c148aad99b93972d483e2a9c6168e62efa017f8e225b61d54712782021-03-07 11:56:5198 days 21 hrs ago 0x216944baf1182e49252223e78b783fe7d5a02223 Bitcoin Standard Hashrate: BTCST Token0 BNB
0xe906c20f014ea0a9019e9afedfb4b96980626567255e4d561b162eb4219505c454712342021-03-07 11:54:3998 days 21 hrs ago Bitcoin Standard Hashrate: BTCST Token Bitcoin Standard Hashrate: Implementation0 BNB
0xe906c20f014ea0a9019e9afedfb4b96980626567255e4d561b162eb4219505c454712342021-03-07 11:54:3998 days 21 hrs ago 0x216944baf1182e49252223e78b783fe7d5a02223 Bitcoin Standard Hashrate: BTCST Token0 BNB
0x12a276bb90235fedd8fdfa1daf8de074e50cb0a5cc567d0121eda9f7b4079db654712172021-03-07 11:53:4898 days 21 hrs ago Bitcoin Standard Hashrate: BTCST Token Bitcoin Standard Hashrate: Implementation0 BNB
0xc27e5aee46dc723221be9c3959251faf24485af3a9e7e7bff22cf6e77a66be8a54711712021-03-07 11:51:3098 days 21 hrs ago Bitcoin Standard Hashrate: BTCST Token Bitcoin Standard Hashrate: Implementation0 BNB
0xc27e5aee46dc723221be9c3959251faf24485af3a9e7e7bff22cf6e77a66be8a54711712021-03-07 11:51:3098 days 21 hrs ago PancakeSwap: BTCST 2 Bitcoin Standard Hashrate: BTCST Token0 BNB
0xc27e5aee46dc723221be9c3959251faf24485af3a9e7e7bff22cf6e77a66be8a54711712021-03-07 11:51:3098 days 21 hrs ago Bitcoin Standard Hashrate: BTCST Token Bitcoin Standard Hashrate: Implementation0 BNB
0xc27e5aee46dc723221be9c3959251faf24485af3a9e7e7bff22cf6e77a66be8a54711712021-03-07 11:51:3098 days 21 hrs ago PancakeSwap: Router Bitcoin Standard Hashrate: BTCST Token0 BNB
0x3188c33dcb71f806074af2ac2cbe1820feb2ec93fd5a44ee5c2bd438b2d3bd9354711652021-03-07 11:51:1298 days 21 hrs ago Bitcoin Standard Hashrate: BTCST Token Bitcoin Standard Hashrate: Implementation0 BNB
0x3188c33dcb71f806074af2ac2cbe1820feb2ec93fd5a44ee5c2bd438b2d3bd9354711652021-03-07 11:51:1298 days 21 hrs ago PancakeSwap: Router Bitcoin Standard Hashrate: BTCST Token0 BNB
0x3188c33dcb71f806074af2ac2cbe1820feb2ec93fd5a44ee5c2bd438b2d3bd9354711652021-03-07 11:51:1298 days 21 hrs ago Bitcoin Standard Hashrate: BTCST Token Bitcoin Standard Hashrate: Implementation0 BNB
0x3188c33dcb71f806074af2ac2cbe1820feb2ec93fd5a44ee5c2bd438b2d3bd9354711652021-03-07 11:51:1298 days 21 hrs ago PancakeSwap: BTCST 2 Bitcoin Standard Hashrate: BTCST Token0 BNB
0x3188c33dcb71f806074af2ac2cbe1820feb2ec93fd5a44ee5c2bd438b2d3bd9354711652021-03-07 11:51:1298 days 21 hrs ago Bitcoin Standard Hashrate: BTCST Token Bitcoin Standard Hashrate: Implementation0 BNB
0x3188c33dcb71f806074af2ac2cbe1820feb2ec93fd5a44ee5c2bd438b2d3bd9354711652021-03-07 11:51:1298 days 21 hrs ago PancakeSwap: BTCST 2 Bitcoin Standard Hashrate: BTCST Token0 BNB
0x3188c33dcb71f806074af2ac2cbe1820feb2ec93fd5a44ee5c2bd438b2d3bd9354711652021-03-07 11:51:1298 days 21 hrs ago Bitcoin Standard Hashrate: BTCST Token Bitcoin Standard Hashrate: Implementation0 BNB
0x3188c33dcb71f806074af2ac2cbe1820feb2ec93fd5a44ee5c2bd438b2d3bd9354711652021-03-07 11:51:1298 days 21 hrs ago PancakeSwap: BTCST 2 Bitcoin Standard Hashrate: BTCST Token0 BNB
0xeefada59647e28e9805d3e480a4e2696c68ed4f76c9eb5ce6ab5da75e7b87a5e54711642021-03-07 11:51:0998 days 21 hrs ago Bitcoin Standard Hashrate: BTCST Token Bitcoin Standard Hashrate: Implementation0 BNB
0x0ca66953219d646f8f0436aaf323e5dd559cb2320c0d2c6585b9b0c20f31f1f954711502021-03-07 11:50:2798 days 21 hrs ago Bitcoin Standard Hashrate: BTCST Token Bitcoin Standard Hashrate: Implementation0 BNB
0xe9f44f95025898c4eda16ff80b7bb088102d72c5a69154d2305d70a4ea51d5aa54711272021-03-07 11:49:1898 days 21 hrs ago Bitcoin Standard Hashrate: BTCST Token Bitcoin Standard Hashrate: Implementation0 BNB
0xe9f44f95025898c4eda16ff80b7bb088102d72c5a69154d2305d70a4ea51d5aa54711272021-03-07 11:49:1898 days 21 hrs ago PancakeSwap: BTCST 2 Bitcoin Standard Hashrate: BTCST Token0 BNB
0xe9f44f95025898c4eda16ff80b7bb088102d72c5a69154d2305d70a4ea51d5aa54711272021-03-07 11:49:1898 days 21 hrs ago Bitcoin Standard Hashrate: BTCST Token Bitcoin Standard Hashrate: Implementation0 BNB
0xe9f44f95025898c4eda16ff80b7bb088102d72c5a69154d2305d70a4ea51d5aa54711272021-03-07 11:49:1898 days 21 hrs ago PancakeSwap: BTCST 2 Bitcoin Standard Hashrate: BTCST Token0 BNB
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Contract Source Code Verified (Similar Match)
Note: This contract matches the deployed ByteCode of the Source Code for Contract 0x443e8ad4652ca341ce9027506fdc45b1951fa1de

Contract Name:
AdminUpgradeabilityProxy

Compiler Version
v0.6.8+commit.0bbfe453

Optimization Enabled:
No with 200 runs

Other Settings:
default evmVersion, MIT license

Contract Source Code (Solidity Multiple files format)

File 1 of 8: AdminUpgradeabilityProxy.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

import './UpgradeabilityProxy.sol';

/**
 * @title AdminUpgradeabilityProxy
 * @dev This contract combines an upgradeability proxy with an authorization
 * mechanism for administrative tasks.
 * All external functions in this contract must be guarded by the
 * `ifAdmin` modifier. See ethereum/solidity#3864 for a Solidity
 * feature proposal that would enable this to be done automatically.
 */
contract AdminUpgradeabilityProxy is UpgradeabilityProxy {
  /**
   * Contract constructor.
   * @param _logic address of the initial implementation.
   * @param _admin Address of the proxy administrator.
   * @param _data Data to send as msg.data to the implementation to initialize the proxied contract.
   * It should include the signature and the parameters of the function to be called, as described in
   * https://solidity.readthedocs.io/en/v0.4.24/abi-spec.html#function-selector-and-argument-encoding.
   * This parameter is optional, if no data is given the initialization call to proxied contract will be skipped.
   */
  constructor(address _logic, address _admin, bytes memory _data) UpgradeabilityProxy(_logic, _data) public payable {
    assert(ADMIN_SLOT == bytes32(uint256(keccak256('eip1967.proxy.admin')) - 1));
    _setAdmin(_admin);
  }

  /**
   * @dev Emitted when the administration has been transferred.
   * @param previousAdmin Address of the previous admin.
   * @param newAdmin Address of the new admin.
   */
  event AdminChanged(address previousAdmin, address newAdmin);

  /**
   * @dev Storage slot with the admin of the contract.
   * This is the keccak-256 hash of "eip1967.proxy.admin" subtracted by 1, and is
   * validated in the constructor.
   */

  bytes32 internal constant ADMIN_SLOT = 0xb53127684a568b3173ae13b9f8a6016e243e63b6e8ee1178d6a717850b5d6103;

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

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

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

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

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

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

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

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

    assembly {
      sstore(slot, newAdmin)
    }
  }

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

File 2 of 8: Address.sol
// SPDX-License-Identifier: MIT

pragma solidity >=0.6.2 <0.8.0;

/**
 * @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) {
        // 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);
    }

    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);
            }
        }
    }
}

File 3 of 8: Context.sol
// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/*
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with GSN meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address payable) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

File 4 of 8: Initializable.sol
// SPDX-License-Identifier: MIT

// solhint-disable-next-line compiler-version
pragma solidity >=0.4.24 <0.8.0;


/**
 * @dev This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed
 * behind a proxy. Since a proxied contract can't have a constructor, it's common to move constructor logic to an
 * external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer
 * function so it can only be called once. The {initializer} modifier provided by this contract will have this effect.
 * 
 * TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as
 * possible by providing the encoded function call as the `_data` argument to {UpgradeableProxy-constructor}.
 * 
 * CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure
 * that all initializers are idempotent. This is not verified automatically as constructors are by Solidity.
 */
abstract contract Initializable {

    /**
     * @dev Indicates that the contract has been initialized.
     */
    bool private _initialized;

    /**
     * @dev Indicates that the contract is in the process of being initialized.
     */
    bool private _initializing;

    /**
     * @dev Modifier to protect an initializer function from being invoked twice.
     */
    modifier initializer() {
        require(_initializing || _isConstructor() || !_initialized, "Initializable: contract is already initialized");

        bool isTopLevelCall = !_initializing;
        if (isTopLevelCall) {
            _initializing = true;
            _initialized = true;
        }

        _;

        if (isTopLevelCall) {
            _initializing = false;
        }
    }

    /// @dev Returns true if and only if the function is running in the constructor
    function _isConstructor() private view returns (bool) {
        // extcodesize checks the size of the code stored in an address, and
        // address returns the current address. Since the code is still not
        // deployed when running a constructor, any checks on its code size will
        // yield zero, making it an effective way to detect if a contract is
        // under construction or not.
        address self = address(this);
        uint256 cs;
        // solhint-disable-next-line no-inline-assembly
        assembly { cs := extcodesize(self) }
        return cs == 0;
    }
}

File 5 of 8: Ownable.sol
// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

import "./Context.sol";
/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor () internal {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(_owner == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

File 6 of 8: Proxy.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

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

  /**
   * @dev Receive function.
   * Implemented entirely in `_fallback`.
   */
  receive () payable external {
    _fallback();
  }

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

  /**
   * @dev Delegates execution to an implementation contract.
   * This is a low level function that doesn't return to its internal call site.
   * It will return to the external caller whatever the implementation returns.
   * @param implementation Address to delegate.
   */
  function _delegate(address implementation) internal {
    assembly {
      // Copy msg.data. We take full control of memory in this inline assembly
      // block because it will not return to Solidity code. We overwrite the
      // Solidity scratch pad at memory position 0.
      calldatacopy(0, 0, calldatasize())

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

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

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

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

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

File 7 of 8: ProxyAdmin.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

import "./Ownable.sol";
import "./AdminUpgradeabilityProxy.sol";

/**
 * @title ProxyAdmin
 * @dev This contract is the admin of a proxy, and is in charge
 * of upgrading it as well as transferring it to another admin.
 */
contract ProxyAdmin is Ownable {
  
  /**
   * @dev Returns the current implementation of a proxy.
   * This is needed because only the proxy admin can query it.
   * @return The address of the current implementation of the proxy.
   */
  function getProxyImplementation(AdminUpgradeabilityProxy proxy) public view returns (address) {
    // We need to manually run the static call since the getter cannot be flagged as view
    // bytes4(keccak256("implementation()")) == 0x5c60da1b
    (bool success, bytes memory returndata) = address(proxy).staticcall(hex"5c60da1b");
    require(success);
    return abi.decode(returndata, (address));
  }

  /**
   * @dev Returns the admin of a proxy. Only the admin can query it.
   * @return The address of the current admin of the proxy.
   */
  function getProxyAdmin(AdminUpgradeabilityProxy proxy) public view returns (address) {
    // We need to manually run the static call since the getter cannot be flagged as view
    // bytes4(keccak256("admin()")) == 0xf851a440
    (bool success, bytes memory returndata) = address(proxy).staticcall(hex"f851a440");
    require(success);
    return abi.decode(returndata, (address));
  }

  /**
   * @dev Changes the admin of a proxy.
   * @param proxy Proxy to change admin.
   * @param newAdmin Address to transfer proxy administration to.
   */
  function changeProxyAdmin(AdminUpgradeabilityProxy proxy, address newAdmin) public onlyOwner {
    proxy.changeAdmin(newAdmin);
  }

  /**
   * @dev Upgrades a proxy to the newest implementation of a contract.
   * @param proxy Proxy to be upgraded.
   * @param implementation the address of the Implementation.
   */
  function upgrade(AdminUpgradeabilityProxy proxy, address implementation) public onlyOwner {
    proxy.upgradeTo(implementation);
  }

  /**
   * @dev Upgrades a proxy to the newest implementation of a contract and forwards a function call to it.
   * This is useful to initialize the proxied contract.
   * @param proxy Proxy to be upgraded.
   * @param implementation Address of the Implementation.
   * @param data Data to send as msg.data in the low level call.
   * It should include the signature and the parameters of the function to be called, as described in
   * https://solidity.readthedocs.io/en/v0.4.24/abi-spec.html#function-selector-and-argument-encoding.
   */
  function upgradeAndCall(AdminUpgradeabilityProxy proxy, address implementation, bytes memory data) payable public onlyOwner {
    proxy.upgradeToAndCall{value: msg.value}(implementation, data);
  }
}

File 8 of 8: UpgradeabilityProxy.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

import './Proxy.sol';
import './Address.sol';

/**
 * @title UpgradeabilityProxy
 * @dev This contract implements a proxy that allows to change the
 * implementation address to which it will delegate.
 * Such a change is called an implementation upgrade.
 */
contract UpgradeabilityProxy is Proxy {
  /**
   * @dev Contract constructor.
   * @param _logic Address of the initial implementation.
   * @param _data Data to send as msg.data to the implementation to initialize the proxied contract.
   * It should include the signature and the parameters of the function to be called, as described in
   * https://solidity.readthedocs.io/en/v0.4.24/abi-spec.html#function-selector-and-argument-encoding.
   * This parameter is optional, if no data is given the initialization call to proxied contract will be skipped.
   */
  constructor(address _logic, bytes memory _data) public payable {
    assert(IMPLEMENTATION_SLOT == bytes32(uint256(keccak256('eip1967.proxy.implementation')) - 1));
    _setImplementation(_logic);
    if(_data.length > 0) {
      (bool success,) = _logic.delegatecall(_data);
      require(success);
    }
  }  

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

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

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

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

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

    bytes32 slot = IMPLEMENTATION_SLOT;

    assembly {
      sstore(slot, newImplementation)
    }
  }
}

Contract ABI

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Deployed ByteCode Sourcemap

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Swarm Source

ipfs://b0503c23d64d00872f309af6ebc439401f4a3a5289bbb698fa4e5aabd7476426
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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