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Contract 0x86ed939b500e121c0c5f493f399084db596dad20

 
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Txn Hash Method
Block
From
To
Value
0x47dd4ae7d6a692a3d1c7abd7eb384766132f5b48f9652e433924bf997785353ePending(pending)2021-04-15 12:50:111 hr 32 mins ago0xa613ddee90b787e233a141488636f31746ed2332 IN SpaceChainV2: SPC Token0 Ether(Pending)(Pending)
0xbf99cd9366d07db7d1fe4ced1540443e561d7ddb2fb1f3609c7a36e402d5b4e2Pending(pending)2021-04-15 11:26:162 hrs 56 mins ago0xa613ddee90b787e233a141488636f31746ed2332 IN SpaceChainV2: SPC Token0 Ether(Pending)(Pending)
0x2fd6eb8f690cfc3ee9b77e8bbf9b31d1878169c5358a814608bca74ecc394d24Pending(pending)2021-04-15 11:08:003 hrs 14 mins agoBittrex IN SpaceChainV2: SPC Token0 Ether(Pending)(Pending)
0xc8451b42ceeb60cf43081b74373272875a94200d9555a8e988ba0a0dd24c869dPending(pending)2021-04-15 0:16:4114 hrs 5 mins ago0xf78845201bf2e074d6d565f7453f15a1f2355bbe IN SpaceChainV2: SPC Token0 Ether(Pending)(Pending)
0x0e2d771d4d8582be551e948232c1cd8105d44c9f95cff2bcedce86d525d51303Transfer122440152021-04-15 10:08:454 hrs 13 mins ago0xa613ddee90b787e233a141488636f31746ed2332 IN  SpaceChainV2: SPC Token0 Ether0.00476074592.142857143
0x5e14c8a0fed659af32fee940bf2004cabb6ec668108355b4767d33cb97f5d89aTransfer122427732021-04-15 5:28:258 hrs 53 mins ago0x13297c44accb040a13fd3121b313cd34463a46d1 IN  SpaceChainV2: SPC Token0 Ether0.00207789498
0x8373db96d6d314622b23263b5a18b83d735db276afb24f3714eda51fe522ab18Approve122418132021-04-15 1:55:2112 hrs 27 mins ago0x63df0e12688efafcacacfdb25310702f99094c18 IN  SpaceChainV2: SPC Token0 Ether0.00577278130
0x1bdb8dd409bcbad19284b82b50b12f6841f7de9ac641d2574b9caea63aed325aTransfer122417952021-04-15 1:51:2412 hrs 30 mins agoHitBTC 2 IN  SpaceChainV2: SPC Token0 Ether0.006397375125
0xa37e3e99fc5df03f2aa107ccba7be74346ed91e4ffab302d7b9fb2ff3c45a101Transfer122417932021-04-15 1:51:0912 hrs 31 mins agoHitBTC 3 IN  SpaceChainV2: SPC Token0 Ether0.003762616104
0x1f53748e4e898d6ba6206da00a9be3bce90cc32403f1415b47c0482551a80cacTransfer122416402021-04-15 1:21:3413 hrs agoHitBTC 2 IN  SpaceChainV2: SPC Token0 Ether0.005320077147
0x503333da88608229a3f62cbc35b9554377078134dd09560e7c43d24bf8941502Transfer122416372021-04-15 1:21:0013 hrs 1 min agoHitBTC 3 IN  SpaceChainV2: SPC Token0 Ether0.00477381905131.95
0xe3d29a6c635c5347caf8c2f6a7c76ab9ea00707887d80354ac6c256ea906cc33Transfer122415802021-04-15 1:08:4113 hrs 13 mins ago0x93d6e64795cadc1fcb4fd94b4330f01e904ec9a7 IN  SpaceChainV2: SPC Token0 Ether0.00470639130
0x8659e32dfca98acd0dc6959e53ffc60ad6c84257cf111f0177fdb12b6a62ec35Transfer122409102021-04-14 22:29:1415 hrs 53 mins ago0x3c9f50c9d4be35c734290b95f563d4dd621e240c IN  SpaceChainV2: SPC Token0 Ether0.002247518106
0xe043f666b4dcac00747f0ccf2583a35e8f814f0d123e790625f351da5ee8c7e0Transfer122407052021-04-14 21:48:5616 hrs 33 mins ago0x6ddc37aa4462da348f1a012b2d6a78d60888e480 IN  SpaceChainV2: SPC Token0 Ether0.005679537111
0xf97b94b1bc6d4c4a20a7cf8262f05b981a7ca0c8e48c0b63f87f313c0dd4478cApprove122405862021-04-14 21:21:1117 hrs 1 min ago0x346e13ac270ca6e7d536688abb1bbbd51b12b517 IN  SpaceChainV2: SPC Token0 Ether0.004618224104
0xcdf284cfe8bd0d824b49cb3af3d9f7eb18eb4f247c7e85e2b61b3d8ed5548702Approve122404942021-04-14 21:00:5217 hrs 21 mins ago0x7c0830c2fc55e23d23eea9ae8536bdb43dcaba4c IN  SpaceChainV2: SPC Token0 Ether0.005151096116
0xea26bc9184054810a9f0f623071f839d43d46bb2358769e56cb4a9d60239c03eTransfer122401592021-04-14 19:46:2518 hrs 35 mins ago0xa4b0a77c312535b8a5863732acc42cfa7b6af9da IN  SpaceChainV2: SPC Token0 Ether0.003244059153
0x38f0d7e3bbf31f7b0be7df22598ec05facdaf66dfcbf65b8fe9d2d1eeb4326b6Transfer122398442021-04-14 18:31:0119 hrs 51 mins agoHitBTC 2 IN  SpaceChainV2: SPC Token0 Ether0.007669948212
0x42e4756c2da09d10772391e19f233b1401ecda4e97652b3fce8dcb63849bb26fTransfer122397192021-04-14 18:05:2220 hrs 17 mins agoHitBTC 2 IN  SpaceChainV2: SPC Token0 Ether0.011410241223
0xc264d466718f7a8c2d437695e4feb0010487a9946c0d848b20a19c3e720961c3Approve122391682021-04-14 15:58:5322 hrs 23 mins ago0x0160afff7a7a824429a8202995d03239d2d418fa IN  SpaceChainV2: SPC Token0 Ether0.004529412102
0xed19ee8b914587f45fa87bdee25119b1fa00635877668a9d52ac7c2475d79109Transfer122384402021-04-14 13:19:281 day 1 hr ago0xda6ca2f5f77d6a2f324dd063a86ab91b146423a7 IN  SpaceChainV2: SPC Token0 Ether0.003800055105
0xa5891a675c0673ee68977df6254a9251a4ae15d77fc39fbb51bff0c8a1d6ba86Transfer122380632021-04-14 12:00:201 day 2 hrs ago0x1d7fe43995fd37bb87c73094cd70b0649a6df75d IN  SpaceChainV2: SPC Token0 Ether0.006550912128
0xeac3fae3e48d83cb234e48011a8e707d722fc3ee6b9478f4d8f589b87b6f775dMigrate V1tokens122379832021-04-14 11:40:051 day 2 hrs ago0xda6ca2f5f77d6a2f324dd063a86ab91b146423a7 IN  SpaceChainV2: SPC Token0 Ether0.00401207206886.000001459
0x731131205b1dd0b9e0d5b2f160998f5951a62a0e782be19cfa11cc4bdd0d0165Approve122379332021-04-14 11:29:311 day 2 hrs ago0xe2f599c2d119a44ff94ee4e15948cd527926b15b IN  SpaceChainV2: SPC Token0 Ether0.004618224104
0x8b3ce4a381df916e925af5a8ab29a90ecf5d7b4698b8335fc0350a1e69596e73Transfer122377842021-04-14 10:53:511 day 3 hrs ago0xc77349c134db15b5bacd1f18a36e89490dda03d0 IN  SpaceChainV2: SPC Token0 Ether0.00196853193
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OVERVIEW

The enhanced version (v2) will grant holders access to collateral and lending pools in decentralized exchanges, unlocking liquidity, and growth opportunities in a fully peer-to-peer environment.

Latest 25 internal transaction
Parent Txn Hash Block From To Value
0xbe08907ae99d8f0a7c85e3b3e3a18be4e2548714c951ae9e350cca298d49e729122375612021-04-14 10:07:271 day 4 hrs ago SpaceChainV2: SPC Token  Contract Creation0 Ether
0x3a961e328705fbaf8ed4a83d1bf10c7b84257f6d5ce56fa4c9ac63681954bd05122203662021-04-11 18:38:573 days 19 hrs ago SpaceChainV2: SPC Token  Contract Creation0 Ether
0x279d8c9e3bcdd62369a384ec33d9b2a8161ec4035b72c7cbe4295ba5ce5bb8f1122041542021-04-09 6:53:426 days 7 hrs ago SpaceChainV2: SPC Token  Contract Creation0 Ether
0x70424e6f5253a887537505ea45f94a6b03dda1ae6462a5ac22790f20ed38aa60121935782021-04-07 15:48:307 days 22 hrs ago SpaceChainV2: SPC Token  Contract Creation0 Ether
0x1e797e14da749b764ea4c793324b96fd48b03a1810a8311d5522f30cba4152a5121935672021-04-07 15:46:337 days 22 hrs ago SpaceChainV2: SPC Token  Contract Creation0 Ether
0x6405a9a3d754fb37e1f4cee5811a16d229a456e72bb45d6905c57d279a06c459121931792021-04-07 14:21:238 days ago SpaceChainV2: SPC Token  Contract Creation0 Ether
0x7837d3635683eef392ca59cedea3dc529a006cfad9caf46cce3f9d5fe3b11dfe121388982021-03-30 6:03:3416 days 8 hrs ago SpaceChainV2: SPC Token  Contract Creation0 Ether
0xc5075c5569d9bf1454aa77c61bd28a65d7b9e812c6a28e506d53660af0ab5dc9121196942021-03-27 7:02:5719 days 7 hrs ago SpaceChainV2: SPC Token  Contract Creation0 Ether
0x8f7e10413bb69bdde97f49f09221781627d4648ad7cefc76eb7a63b5e72481d7121118012021-03-26 2:02:1520 days 12 hrs ago SpaceChainV2: SPC Token  Contract Creation0 Ether
0x2682776108be312b1760fb9cb57608663eda9964547b9b6844c943c1d5fda803120967052021-03-23 18:15:0322 days 20 hrs ago SpaceChainV2: SPC Token  Contract Creation0 Ether
0x27ffb2b48d71e6db7e2343a99a02a72207885ca51b54cb01ff9c66ee679849da120782312021-03-20 21:51:0925 days 16 hrs ago SpaceChainV2: SPC Token  Contract Creation0 Ether
0xe4c5ed670cdda2230a636479a19f525b4cc32c970bad64b66c9dc21e44bcda6e120752352021-03-20 10:46:2926 days 3 hrs ago SpaceChainV2: SPC Token  Contract Creation0 Ether
0xb6400d17451c6d344a90c9c736598ea4aff80f0c72155c3fe8563bf91b5fe753120737112021-03-20 5:05:3726 days 9 hrs ago SpaceChainV2: SPC Token  Contract Creation0 Ether
0xb98ad5bf3300ff4d84bf62cb538ef28a7b7d601a8c1ae46caea0ffaaa1da5099119729212021-03-04 16:33:3941 days 21 hrs ago SpaceChainV2: SPC Token  Contract Creation0 Ether
0xd11f1917d63b6aa82a05787118d31f102e91e3e5b2a9c0f385382903a53ad04a119665982021-03-03 17:10:4042 days 21 hrs ago SpaceChainV2: SPC Token  Contract Creation0 Ether
0x3620b43af9a516bc0e9621d8e378cc53ba44b8dadd45c7e2c73e4406cde35609119652812021-03-03 12:29:3643 days 1 hr ago SpaceChainV2: SPC Token  Contract Creation0 Ether
0x945043cbf3042189a6f229beb138f5f7002fe217ffd2402799db35dab893cb65119642532021-03-03 8:41:4143 days 5 hrs ago SpaceChainV2: SPC Token  Contract Creation0 Ether
0x91e9ecbcbc7bc0dd58e2fce20705c82742b6e5598cb77658401a39c973e0ff23119557862021-03-02 1:14:5244 days 13 hrs ago SpaceChainV2: SPC Token  Contract Creation0 Ether
0xd8d8980d991f057be8e53dd07febeca83446f13effcbfc315229b202003463f0119511672021-03-01 8:06:1045 days 6 hrs ago SpaceChainV2: SPC Token  Contract Creation0 Ether
0xc3618792c65f7c89cd33db3e3b7184b234aa7044bcf83bdb3d381deb435da888119489322021-02-28 23:54:1645 days 14 hrs ago SpaceChainV2: SPC Token  Contract Creation0 Ether
0x6ec93e8b00c5081fac437701d9267acca422c780d339b39610b1f6b12de3b56e119417642021-02-27 21:25:4046 days 16 hrs ago SpaceChainV2: SPC Token  Contract Creation0 Ether
0x829dc9dfbadc9d50609f7d2336fa2290e296641836a92c9a7a39227e0a38c1e8119366182021-02-27 2:17:5047 days 12 hrs ago SpaceChainV2: SPC Token  Contract Creation0 Ether
0x7f2ffddb8f38b35ca79f25e2e67dc78d124368ace45dfd6d3672b0c58ac31a98119329132021-02-26 12:43:1448 days 1 hr ago SpaceChainV2: SPC Token  Contract Creation0 Ether
0xf578de98e9944265548e6464cb239e08c1a04a00560fd55830d7661ad32e728a119313922021-02-26 7:09:4648 days 7 hrs ago SpaceChainV2: SPC Token  Contract Creation0 Ether
0xf36cecdee6f8ff2fa205a3929130e21c2548b6acd99f7a630248c5dd81edb35a119313792021-02-26 7:06:1448 days 7 hrs ago SpaceChainV2: SPC Token  Contract Creation0 Ether
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Loading

Contract Source Code Verified (Exact Match)

Contract Name:
SpaceChain

Compiler Version
v0.6.12+commit.27d51765

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion, MIT license

Contract Source Code (Solidity)

/**
 *Submitted for verification at Etherscan.io on 2020-09-19
*/

// File: @openzeppelin/contracts/GSN/Context.sol
// SPDX-License-Identifier: MIT


pragma solidity ^0.6.0;

/*
 * @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: @openzeppelin/contracts/token/ERC20/IERC20.sol



pragma solidity ^0.6.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

// File: @openzeppelin/contracts/math/SafeMath.sol



pragma solidity ^0.6.0;

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");

        return c;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;

        return c;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) {
            return 0;
        }

        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, "SafeMath: division by zero");
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return mod(a, b, "SafeMath: modulo by zero");
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts with custom message when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}

// File: @openzeppelin/contracts/utils/Address.sol



pragma solidity ^0.6.2;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // According to EIP-1052, 0x0 is the value returned for not-yet created accounts
        // and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned
        // for accounts without code, i.e. `keccak256('')`
        bytes32 codehash;
        bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;
        // solhint-disable-next-line no-inline-assembly
        assembly { codehash := extcodehash(account) }
        return (codehash != accountHash && codehash != 0x0);
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (bool success, ) = recipient.call{ value: amount }("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain`call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
      return functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        return _functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        return _functionCallWithValue(target, data, value, errorMessage);
    }

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

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{ value: weiValue }(data);
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// File: @openzeppelin/contracts/token/ERC20/ERC20.sol



pragma solidity ^0.6.0;





/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * We have followed general OpenZeppelin guidelines: functions revert instead
 * of returning `false` on failure. This behavior is nonetheless conventional
 * and does not conflict with the expectations of ERC20 applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20 is Context, IERC20 {
    using SafeMath for uint256;
    using Address for address;

    mapping (address => uint256) private _balances;

    mapping (address => mapping (address => uint256)) private _allowances;

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;
    uint8 private _decimals;

    /**
     * @dev Sets the values for {name} and {symbol}, initializes {decimals} with
     * a default value of 18.
     *
     * To select a different value for {decimals}, use {_setupDecimals}.
     *
     * All three of these values are immutable: they can only be set once during
     * construction.
     */
    constructor (string memory name, string memory symbol) public {
        _name = name;
        _symbol = symbol;
        _decimals = 18;
    }

    /**
     * @dev Returns the name of the token.
     */
    function name() public view returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5,05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the value {ERC20} uses, unless {_setupDecimals} is
     * called.
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view returns (uint8) {
        return _decimals;
    }

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view override returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view override returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `recipient` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20};
     *
     * Requirements:
     * - `sender` and `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     * - the caller must have allowance for ``sender``'s tokens of at least
     * `amount`.
     */
    function transferFrom(address sender, address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
        return true;
    }

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
        return true;
    }

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
        return true;
    }

    /**
     * @dev Moves tokens `amount` from `sender` to `recipient`.
     *
     * This is internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     *
     * - `sender` cannot be the zero address.
     * - `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     */
    function _transfer(address sender, address recipient, uint256 amount) internal virtual {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(sender, recipient, amount);

        _balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance");
        _balances[recipient] = _balances[recipient].add(amount);
        emit Transfer(sender, recipient, amount);
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements
     *
     * - `to` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _beforeTokenTransfer(address(0), account, amount);

        _totalSupply = _totalSupply.add(amount);
        _balances[account] = _balances[account].add(amount);
        emit Transfer(address(0), account, amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        _balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance");
        _totalSupply = _totalSupply.sub(amount);
        emit Transfer(account, address(0), amount);
    }

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner`s tokens.
     *
     * This is internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(address owner, address spender, uint256 amount) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    /**
     * @dev Sets {decimals} to a value other than the default one of 18.
     *
     * WARNING: This function should only be called from the constructor. Most
     * applications that interact with token contracts will not expect
     * {decimals} to ever change, and may work incorrectly if it does.
     */
    function _setupDecimals(uint8 decimals_) internal {
        _decimals = decimals_;
    }

    /**
     * @dev Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * will be to transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual { }
}

// File: @openzeppelin/contracts/token/ERC20/ERC20Burnable.sol



pragma solidity ^0.6.0;



/**
 * @dev Extension of {ERC20} that allows token holders to destroy both their own
 * tokens and those that they have an allowance for, in a way that can be
 * recognized off-chain (via event analysis).
 */
abstract contract ERC20Burnable is Context, ERC20 {
    /**
     * @dev Destroys `amount` tokens from the caller.
     *
     * See {ERC20-_burn}.
     */
    function burn(uint256 amount) public virtual {
        _burn(_msgSender(), amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, deducting from the caller's
     * allowance.
     *
     * See {ERC20-_burn} and {ERC20-allowance}.
     *
     * Requirements:
     *
     * - the caller must have allowance for ``accounts``'s tokens of at least
     * `amount`.
     */
    function burnFrom(address account, uint256 amount) public virtual {
        uint256 decreasedAllowance = allowance(account, _msgSender()).sub(amount, "ERC20: burn amount exceeds allowance");

        _approve(account, _msgSender(), decreasedAllowance);
        _burn(account, amount);
    }
}

// File: @openzeppelin/contracts/access/Ownable.sol



pragma solidity ^0.6.0;

/**
 * @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.
 */
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: contracts/TokenUpgrader.sol

pragma solidity ^0.6.6;

contract TokenUpgrader is Ownable {
    ERC20Burnable public token = ERC20Burnable(0x8069080a922834460C3A092FB2c1510224dc066b);
    address public tokenHolder;

    constructor(address _tokenHolder) public {
        tokenHolder = _tokenHolder;
    }

    function burn(uint256 _amount) public onlyOwner {
        // burn token from contract's balance
        token.burn(_amount);
    }

    function withdraw(uint256 _amount) public {
        require(_msgSender() == tokenHolder);
        token.transfer(_msgSender(), _amount);
    }
}

// File: contracts/SpaceChain.sol




pragma solidity ^0.6.6;

contract SpaceChain is ERC20Burnable {
    mapping(address => TokenUpgrader) public tokenUpgrader;

    constructor() public ERC20("SpaceChainV2", "SPC") {}

    function migrateV1tokens() public {
        require(
            address(tokenUpgrader[_msgSender()]) != address(0x0),
            "Upgrader contract not created"
        );
        TokenUpgrader upgrader = tokenUpgrader[_msgSender()];
        IERC20 tokenv1 = IERC20(0x8069080a922834460C3A092FB2c1510224dc066b);
        uint256 amount = tokenv1.balanceOf(address(upgrader));
        upgrader.burn(amount);
        _mint(_msgSender(), amount);
    }

    function createUpgrader() public {
        require(
            address(tokenUpgrader[_msgSender()]) == address(0x0),
            "Already created upgrader contract"
        );
        tokenUpgrader[_msgSender()] = new TokenUpgrader(_msgSender());
    }
}

Contract Security Audit

Contract ABI

[{"inputs":[],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":true,"internalType":"address","name":"spender","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"Approval","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":true,"internalType":"address","name":"to","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"Transfer","type":"event"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"address","name":"spender","type":"address"}],"name":"allowance","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"approve","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"burn","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"burnFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"createUpgrader","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"decimals","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"subtractedValue","type":"uint256"}],"name":"decreaseAllowance","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"addedValue","type":"uint256"}],"name":"increaseAllowance","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"migrateV1tokens","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"tokenUpgrader","outputs":[{"internalType":"contract TokenUpgrader","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transfer","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"sender","type":"address"},{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"}]

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Swarm Source

ipfs://ba00bf8333f9460de9340f2687c5e7bbd266f6f14a4d2ebb170c7a5a645ed0a9
Block Transaction Difficulty Gas Used Reward
Block Uncle Number Difficulty Gas Used Reward
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