ETH Price: $3,485.33 (+2.62%)

Token

Mask Network (MASK)
 

Overview

Max Total Supply

100,000,000 MASK

Holders

13,960 ( -0.014%)

Market

Price

$3.23 @ 0.000927 ETH (+2.83%)

Onchain Market Cap

$323,000,000.00

Circulating Supply Market Cap

$323,996,825.00

Other Info

Token Contract (WITH 18 Decimals)

Balance
49.626405478696597019 MASK

Value
$160.29 ( ~0.0459898567441504 Eth) [0.0000%]
0x45a6e007c874ffc6321d6fb90eac272dd6864bfa
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OVERVIEW

Mask Network allows users to encrypt content when posting on You-Know-Where and only the users and their friends can decrypt them.

Market

Volume (24H):$110,994,167.00
Market Capitalization:$323,996,825.00
Circulating Supply:100,000,000.00 MASK
Market Data Source: Coinmarketcap

# Exchange Pair Price  24H Volume % Volume
1
BTCC
MASK-USDT$3.24
0.0009289 Eth
$33,221,752.00
10,361,793.500 MASK
31.1784%
2
Bitrue
MASK-USDT$3.23
0.0009277 Eth
$26,516,853.00
8,197,694.700 MASK
24.6666%
3
Binance
MASK-USDT$3.24
0.0009283 Eth
$9,096,877.00
2,841,711.900 MASK
8.5506%
4
LBank
MASK-USDT$3.24
0.0009282 Eth
$4,938,860.00
1,525,996.940 MASK
4.5917%
5
Bibox
MASK-USDT$3.25
0.0009337 Eth
$4,846,306.00
1,489,189.000 MASK
4.4809%
6
Websea
MASK-USDT$3.23
0.0009273 Eth
$4,131,085.00
0.000 MASK
0.0000%
7
Upbit
MASK-KRW$3.32
0.0009520 Eth
$4,040,904.00
1,217,766.909 MASK
3.6642%
8
OKX
MASK-USDT$3.24
0.0009282 Eth
$2,915,267.00
907,232.037 MASK
2.7298%
9
Gate.io
MASK-USDT$3.23
0.0009267 Eth
$2,412,814.00
752,600.400 MASK
2.2646%
10
HTX
MASK-USDT$3.24
0.0009292 Eth
$1,909,136.00
595,127.828 MASK
1.7907%
11
BYDFi
MASK-USDT$3.23
0.0009246 Eth
$1,880,531.00
582,270.900 MASK
1.7520%
12
Bitget
MASK-USDT$3.24
0.0009289 Eth
$1,593,858.00
497,097.918 MASK
1.4958%
13
Bybit
MASK-USDT$3.24
0.0009290 Eth
$1,533,061.00
478,209.170 MASK
1.4389%
14
MEXC
MASK-USDT$3.23
0.0009271 Eth
$1,164,790.00
360,347.810 MASK
1.0843%
15
Hotcoin
MASK-USDT$3.23
0.0009268 Eth
$996,765.00
308,461.700 MASK
0.9282%
16
Coinbase Exchange
MASK-USD$3.24
0.0009294 Eth
$957,596.00
295,554.290 MASK
0.8893%
17
WhiteBIT
MASK-USDT$3.24
0.0009291 Eth
$948,932.00
292,924.322 MASK
0.8814%
18
Biconomy.com
MASK-USDT$3.23
0.0009266 Eth
$930,593.00
290,323.685 MASK
0.8736%
19
Toobit
MASK-USDT$3.23
0.0009276 Eth
$927,573.00
289,668.730 MASK
0.8716%
20
Deepcoin
MASK-USDT$3.23
0.0009272 Eth
$870,335.00
273,694.800 MASK
0.8235%
21
Trubit
MASK-USDT$3.24
0.0009270 Eth
$851,508.00
264,457.900 MASK
0.7957%
22
Bitunix
MASK-USDT$3.23
0.0009277 Eth
$842,207.00
260,293.380 MASK
0.7832%
23
Ourbit
MASK-USDT$3.23
0.0009277 Eth
$674,080.00
210,511.950 MASK
0.6334%
24
Bithumb
MASK-KRW$3.31
0.0009498 Eth
$663,599.00
200,438.058 MASK
0.6031%
25
CoinW
MASK-USDT$3.25
0.0009293 Eth
$596,658.00
183,826.515 MASK
0.5531%
26
OrangeX
MASK-USDT$3.24
0.0009287 Eth
$474,524.00
148,323.690 MASK
0.4463%
27
Binance
MASK-TRY$3.24
0.0009299 Eth
$437,510.00
136,129.900 MASK
0.4096%
28
KuCoin
MASK-USDT$3.23
0.0009273 Eth
$429,425.00
132,837.990 MASK
0.3997%
29
Hibt
MASK-USDT$3.23
0.0009277 Eth
$349,319.00
108,728.515 MASK
0.3272%
30
Phemex
MASK-USDT$3.22
0.0009240 Eth
$293,186.00
91,005.623 MASK
0.2738%
31
Dex-Trade
MASK-USDT$3.24
0.0009283 Eth
$282,959.00
87,418.344 MASK
0.2630%
32
BTSE
MASK-USDT$3.24
0.0009279 Eth
$275,155.00
85,047.994 MASK
0.2559%
33
DigiFinex
MASK-USDT$3.24
0.0009289 Eth
$259,042.00
80,013.547 MASK
0.2408%
34
Icrypex
MASK-USDT$3.22
0.0009233 Eth
$244,263.00
75,891.509 MASK
0.2284%
35
BitDelta
MASK-USDT$3.24
0.0009289 Eth
$236,182.00
73,693.100 MASK
0.2217%
36
BIT
MASK-USDT$3.24
0.0009285 Eth
$234,589.00
72,462.762 MASK
0.2180%
37
BtcTurk | Kripto
MASK-TRY$3.25
0.0009307 Eth
$232,963.00
71,786.930 MASK
0.2160%
38
FameEX
MASK-USDT$3.24
0.0009273 Eth
$190,855.00
59,634.110 MASK
0.1794%
39
BVOX
MASK-USDT$3.24
0.0009290 Eth
$187,462.00
58,389.500 MASK
0.1757%
40
CoinTR
MASK-TRY$3.25
0.0009312 Eth
$164,488.00
51,316.700 MASK
0.1544%
41
CoinTR
MASK-USDT$3.24
0.0009280 Eth
$149,167.00
46,486.000 MASK
0.1399%
42
BingX
MASK-USDT$3.24
0.0009293 Eth
$147,216.00
45,921.115 MASK
0.1382%
43
Byte Exchange
MASK-USDT$3.23
0.0009261 Eth
$146,694.00
45,450.054 MASK
0.1368%
44
PointPay
MASK-USDT$3.23
0.0009272 Eth
$144,630.00
45,161.941 MASK
0.1359%
45
AscendEX (BitMax)
MASK-USDT$3.22
0.0009227 Eth
$141,914.00
44,119.100 MASK
0.1328%
46
Tapbit
MASK-USDT$3.23
0.0009268 Eth
$141,517.00
44,168.200 MASK
0.1329%
47
BitMart
MASK-USDT$3.24
0.0009288 Eth
$126,175.00
38,971.860 MASK
0.1173%
48
DeGate
0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$3.24
0.0009281 Eth
$103,842.00
32,434.037 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074
0.0976%
49
ProBit Global
MASK-USDT$3.23
0.0009265 Eth
$95,886.00
29,682.290 MASK
0.0893%
50
Koinpark
MASK-USDT$3.24
0.0009263 Eth
$84,512.00
26,119.136 MASK
0.0786%
51
Binance
MASK-BNB$3.23
0.0009272 Eth
$72,775.00
22,428.200 MASK
0.0675%
52
Uniswap V2 (Ethereum)
0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$3.24
0.0009284 Eth
$71,486.00
22,080.213 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074
0.0664%
53
BloFin
MASK-USDT$3.23
0.0009240 Eth
$67,829.00
21,180.000 MASK
0.0637%
54
Bitbank
MASK-JPY$3.25
0.0009322 Eth
$63,893.00
19,652.953 MASK
0.0591%
55
Paribu
MASK-TRY$3.22
0.0009236 Eth
$54,689.00
16,982.540 MASK
0.0511%
56
Bitvavo
MASK-EUR$3.23
0.0009263 Eth
$51,422.00
15,922.062 MASK
0.0479%
57
BtcTurk | Kripto
MASK-USDT$3.23
0.0009265 Eth
$45,756.00
14,164.010 MASK
0.0426%
58
Coinbase Exchange
MASK-USDT$3.22
0.0009230 Eth
$39,869.00
12,390.880 MASK
0.0373%
59
Coinbase Exchange
MASK-EUR$3.23
0.0009254 Eth
$34,810.00
10,790.240 MASK
0.0325%
60
CoinEx
MASK-USDT$3.22
0.0009249 Eth
$32,762.00
10,322.946 MASK
0.0311%
61
Kraken
MASK-USD$3.22
0.0009243 Eth
$30,417.00
9,440.307 MASK
0.0284%
62
Pionex
MASK-USDT$3.24
0.0009293 Eth
$27,957.00
8,725.679 MASK
0.0263%
63
LATOKEN
MASK-USDT$3.24
0.0009288 Eth
$26,288.00
8,105.165 MASK
0.0244%
64
Tothemoon
MASK-USDT$3.23
0.0009267 Eth
$25,767.00
7,976.500 MASK
0.0240%
65
bitcastle
MASK-USDT$3.24
0.0009289 Eth
$23,599.00
7,381.200 MASK
0.0222%
66
Crypto.com Exchange
MASK-USDT$3.23
0.0009253 Eth
$19,128.53
5,930.400 MASK
0.0178%
67
Bitci TR
MASK-TRY$3.22
0.0009244 Eth
$19,119.30
5,953.870 MASK
0.0179%
68
Vindax
MASK-USDT$3.23
0.0009262 Eth
$17,079.22
5,288.700 MASK
0.0159%
69
Kanga
MASK-USDT$3.23
0.0009278 Eth
$13,563.59
0.000 MASK
0.0000%
70
Upbit
MASK-BTC$3.20
0.0009177 Eth
$10,688.10
3,341.676 MASK
0.0101%
71
OKX
MASK-USDC$3.24
0.0009290 Eth
$8,705.84
2,720.772 MASK
0.0082%
72
Uniswap V3 (Ethereum)
0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$3.27
0.0009372 Eth
$5,840.51
1,796.213 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074
0.0054%
73
Kraken
MASK-EUR$3.25
0.0009314 Eth
$5,571.47
1,716.163 MASK
0.0052%
74
Bit2Me
MASK-EUR$3.25
0.0009310 Eth
$5,531.22
1,704.310 MASK
0.0051%
75
Mudrex
MASK-USDT$3.24
0.0009286 Eth
$5,421.62
1,674.457 MASK
0.0050%
76
Bitlo
MASK-TRY$3.25
0.0009317 Eth
$4,450.22
1,386.712 MASK
0.0042%
77
Nami.Exchange
MASK-VNST$3.23
0.0009267 Eth
$4,374.16
1,353.811 MASK
0.0041%
78
Nami.Exchange
MASK-USDT$3.23
0.0009275 Eth
$4,285.08
1,325.073 MASK
0.0040%
79
Crypto.com Exchange
MASK-USD$3.23
0.0009256 Eth
$4,105.98
1,272.500 MASK
0.0038%
80
Max Maicoin
MASK-USDT$3.21
0.0009214 Eth
$3,684.02
1,146.800 MASK
0.0035%
81
Coinbase Exchange
MASK-GBP$3.23
0.0009268 Eth
$3,066.60
949.200 MASK
0.0029%
82
WEEX
MASK-USDT$3.25
0.0009291 Eth
$2,714.50
841.500 MASK
0.0025%
83
Dex-Trade
MASK-BNB$3.24
0.0009281 Eth
$2,419.65
746.800 MASK
0.0022%
84
Gemini
MASK-USD$3.22
0.0009224 Eth
$2,086.69
649.048 MASK
0.0020%
85
Quickswap
0X2B9E7CCDF0F4E5B24757C1E1A80E311E34CB10C7-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$3.22
0.0009233 Eth
$1,899.39
595.218 0X2B9E7CCDF0F4E5B24757C1E1A80E311E34CB10C7
0.0018%
86
PancakeSwap (v2)
0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$3.21
0.0009220 Eth
$1,491.85
486.212 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3
0.0015%
87
Binance US
MASK-USDT$3.24
0.0009294 Eth
$509.00
156.875 MASK
0.0005%
88
Bittime
MASK-IDR$3.26
0.0009337 Eth
$302.52
93.420 MASK
0.0003%
89
Mercado Bitcoin
MASK-BRL$3.14
0.0009021 Eth
$279.10
88.745 MASK
0.0003%
90
TokoCrypto
MASK-USDT$3.24
0.0009289 Eth
$252.96
78.107 MASK
0.0002%
91
Indodax
MASK-IDR$3.24
0.0009296 Eth
$88.88
27.423 MASK
0.0001%
92
Matcha (Polygon)
0X2B9E7CCDF0F4E5B24757C1E1A80E311E34CB10C7-0XC2132D05D31C914A87C6611C10748AEB04B58E8F$3.21
0.0009216 Eth
$71.61
22.288 0X2B9E7CCDF0F4E5B24757C1E1A80E311E34CB10C7
0.0001%
93
Bancor (V2)
MASK-BNT$3.37
0.0009666 Eth
$55.51
16.472 MASK
0.0000%
94
Uniswap V3 (Polygon)
0X2B9E7CCDF0F4E5B24757C1E1A80E311E34CB10C7-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$3.21
0.0009200 Eth
$41.25
13.046 0X2B9E7CCDF0F4E5B24757C1E1A80E311E34CB10C7
0.0000%
95
Energiswap
0X746514E2C7D91E1E84C20C54D1F6F537B28A7D8E-0XA55F26319462355474A9F2C8790860776A329AA4$3.23
0.0009271 Eth
$37.75
12.035 0X746514E2C7D91E1E84C20C54D1F6F537B28A7D8E
0.0000%
96
BabySwap
0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3-0X55D398326F99059FF775485246999027B3197955$3.21
0.0009209 Eth
$31.25
9.747 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3
0.0000%
97
CEX.IO
MASK-USDT$3.24
0.0009293 Eth
$25.89
8.001 MASK
0.0000%
98
CEX.IO
MASK-USD$3.24
0.0009285 Eth
$24.12
7.468 MASK
0.0000%
99
OKCoin Japan
MASK-JPY$3.24
0.0009282 Eth
$20.84
6.501 MASK
0.0000%
100
Nominex
MASK-USDT$3.24
0.0009288 Eth
$14.35
4.428 MASK
0.0000%

Contract Source Code Verified (Exact Match)

Contract Name:
MaskToken

Compiler Version
v0.6.6+commit.6c089d02

Optimization Enabled:
No with 200 runs

Other Settings:
default evmVersion, MIT license, Audited

Contract Source Code (Solidity)Audit Report

/**
 *Submitted for verification at Etherscan.io on 2021-02-19
*/

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

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/**
 * @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/utils/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: @openzeppelin/contracts/math/SafeMath.sol

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/**
 * @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, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        uint256 c = a + b;
        if (c < a) return (false, 0);
        return (true, c);
    }

    /**
     * @dev Returns the substraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b > a) return (false, 0);
        return (true, a - b);
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, 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 (true, 0);
        uint256 c = a * b;
        if (c / a != b) return (false, 0);
        return (true, c);
    }

    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a / b);
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a % b);
    }

    /**
     * @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) {
        require(b <= a, "SafeMath: subtraction overflow");
        return a - b;
    }

    /**
     * @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) {
        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, reverting 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) {
        require(b > 0, "SafeMath: division by zero");
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting 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) {
        require(b > 0, "SafeMath: modulo by zero");
        return a % b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * 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);
        return a - b;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryDiv}.
     *
     * 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);
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * 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/token/ERC20/ERC20.sol

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;




/**
 * @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;

    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 virtual returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual 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 virtual returns (uint8) {
        return _decimals;
    }

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

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view virtual 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 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 virtual {
        _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: contracts/mask.sol

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;



contract MaskToken is ERC20 {

    constructor() ERC20("Mask Network", "MASK") public {
        _mint(msg.sender, 100_000_000 * (10 ** uint256(decimals())));
    }
}

Contract Security Audit

Contract ABI

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Swarm Source

ipfs://1c80d98e75a30d9f20c93018473aa8e00631c18de5301dcf9daf4ca03d4b4bb1
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