ETH Price: $3,276.66 (+0.79%)
Gas: 1 Gwei

Token

Mask Network (MASK)
 

Overview

Max Total Supply

100,000,000 MASK

Holders

13,805 ( -0.007%)

Market

Price

$2.39 @ 0.000729 ETH (+3.75%)

Onchain Market Cap

$239,000,000.00

Circulating Supply Market Cap

$239,273,041.00

Other Info

Token Contract (WITH 18 Decimals)

Filtered by Token Holder
SushiSwap: MASK-USDC
Balance
1,057.365054795348213061 MASK

Value
$2,527.10 ( ~0.771241730984511 Eth) [0.0011%]
0x31fa985bb0c282a814e7f3f0dce88b2a44197f60
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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):$28,881,211.00
Market Capitalization:$239,273,041.00
Circulating Supply:100,000,000.00 MASK
Market Data Source: Coinmarketcap

# Exchange Pair Price  24H Volume % Volume
1
Bibox
MASK-USDT$2.41
0.0007363 Eth
$4,425,709.00
1,837,514.000 MASK
15.2108%
2
OKX
MASK-USDT$2.40
0.0007327 Eth
$3,979,727.00
1,691,200.735 MASK
13.9996%
3
HTX
MASK-USDT$2.40
0.0007324 Eth
$2,960,022.00
1,257,818.690 MASK
10.4121%
4
Toobit
MASK-USDT$2.40
0.0007324 Eth
$2,442,576.00
1,037,919.400 MASK
8.5918%
5
WhiteBIT
MASK-USDT$2.40
0.0007327 Eth
$1,851,158.00
771,524.124 MASK
6.3866%
6
Binance
MASK-USDT$2.39
0.0007310 Eth
$1,647,187.00
697,812.800 MASK
5.7764%
7
Bitrue
MASK-USDT$2.40
0.0007327 Eth
$1,589,025.00
663,076.800 MASK
5.4889%
8
Bitget
MASK-USDT$2.40
0.0007329 Eth
$1,530,805.00
649,760.017 MASK
5.3786%
9
Bybit
MASK-USDT$2.40
0.0007328 Eth
$1,439,634.00
610,441.340 MASK
5.0532%
10
BloFin
MASK-USDT$2.40
0.0007331 Eth
$1,186,730.00
503,893.800 MASK
4.1712%
11
Upbit
MASK-KRW$2.42
0.0007409 Eth
$1,122,636.00
463,261.214 MASK
3.8348%
12
Trubit
MASK-USDT$2.40
0.0007327 Eth
$708,945.00
301,688.300 MASK
2.4973%
13
KuCoin
MASK-USDT$2.40
0.0007340 Eth
$617,889.00
257,359.189 MASK
2.1304%
14
DigiFinex
MASK-USDT$2.40
0.0007330 Eth
$367,786.00
153,409.617 MASK
1.2699%
15
Deepcoin
MASK-USDT$2.40
0.0007328 Eth
$357,996.00
155,548.800 MASK
1.2876%
16
FMFW.io
MASK-USDT$2.39
0.0007316 Eth
$325,810.00
136,070.780 MASK
1.1264%
17
HitBTC
MASK-USDT$2.39
0.0007321 Eth
$318,589.00
136,090.590 MASK
1.1265%
18
LBank
MASK-USDT$2.40
0.0007334 Eth
$297,735.00
124,043.010 MASK
1.0268%
19
Websea
MASK-USDT$2.40
0.0007327 Eth
$271,808.00
0.000 MASK
0.0000%
20
Hotcoin
MASK-USDT$2.40
0.0007324 Eth
$238,409.00
99,520.300 MASK
0.8238%
21
Coinbase Exchange
MASK-USD$2.40
0.0007333 Eth
$209,043.00
87,101.340 MASK
0.7210%
22
Icrypex
MASK-USDT$2.38
0.0007279 Eth
$194,925.00
81,962.627 MASK
0.6785%
23
BitDelta
MASK-USDT$2.40
0.0007330 Eth
$165,123.00
70,120.800 MASK
0.5805%
24
Bitunix
MASK-USDT$2.39
0.0007319 Eth
$164,741.00
68,833.300 MASK
0.5698%
25
Gate.io
MASK-USDT$2.40
0.0007330 Eth
$159,616.00
67,510.360 MASK
0.5588%
26
AscendEX (BitMax)
MASK-USDT$2.41
0.0007363 Eth
$150,729.00
62,579.800 MASK
0.5180%
27
Tapbit
MASK-USDT$2.40
0.0007324 Eth
$140,098.00
59,433.600 MASK
0.4920%
28
Icrypex
MASK-TRY$2.42
0.0007382 Eth
$127,316.00
52,694.258 MASK
0.4362%
29
OrangeX
MASK-USDT$2.40
0.0007340 Eth
$118,565.00
50,202.570 MASK
0.4156%
30
FameEX
MASK-USDT$2.40
0.0007324 Eth
$104,272.00
44,148.800 MASK
0.3655%
31
BitMart
MASK-USDT$2.40
0.0007327 Eth
$91,432.00
38,151.020 MASK
0.3158%
32
ProBit Global
MASK-USDT$2.40
0.0007324 Eth
$88,232.00
36,805.405 MASK
0.3047%
33
BingX
MASK-USDT$2.40
0.0007324 Eth
$86,607.00
36,751.627 MASK
0.3042%
34
Phemex
MASK-USDT$2.40
0.0007330 Eth
$85,132.00
35,466.432 MASK
0.2936%
35
BtcTurk | Kripto
MASK-TRY$2.41
0.0007349 Eth
$61,560.00
25,594.390 MASK
0.2119%
36
Dex-Trade
MASK-USDT$2.40
0.0007321 Eth
$56,526.00
23,578.400 MASK
0.1952%
37
Bitvavo
MASK-EUR$2.40
0.0007334 Eth
$54,644.00
22,763.060 MASK
0.1884%
38
LATOKEN
MASK-USDT$2.40
0.0007318 Eth
$51,513.00
21,506.406 MASK
0.1780%
39
bitcastle
MASK-USDT$2.40
0.0007327 Eth
$51,173.00
21,655.900 MASK
0.1793%
40
DeGate
0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$2.39
0.0007327 Eth
$41,221.00
17,537.845 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074
0.1452%
41
MEXC
MASK-USDT$2.40
0.0007337 Eth
$35,719.00
14,875.090 MASK
0.1231%
42
Binance
MASK-BNB$2.40
0.0007332 Eth
$34,602.00
14,528.000 MASK
0.1203%
43
Bithumb
MASK-KRW$2.41
0.0007367 Eth
$29,757.00
12,341.917 MASK
0.1022%
44
Uniswap V2 (Ethereum)
0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$2.40
0.0007338 Eth
$28,299.00
11,930.951 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074
0.0988%
45
CoinW
MASK-USDT$2.40
0.0007337 Eth
$27,144.00
11,304.086 MASK
0.0936%
46
Crypto.com Exchange
MASK-USDT$2.40
0.0007327 Eth
$26,131.00
10,904.000 MASK
0.0903%
47
BTSE
MASK-USDT$2.39
0.0007305 Eth
$20,908.00
8,750.579 MASK
0.0724%
48
Binance
MASK-TRY$2.41
0.0007354 Eth
$19,360.89
8,179.200 MASK
0.0677%
49
Cryptology
MASK-USDT$2.40
0.0007345 Eth
$19,122.23
7,958.700 MASK
0.0659%
50
Dex-Trade
MASK-BNB$2.39
0.0007308 Eth
$18,220.88
7,614.000 MASK
0.0630%
51
Pionex
MASK-USDT$2.40
0.0007328 Eth
$16,831.63
7,128.816 MASK
0.0590%
52
Bitci TR
MASK-TRY$2.42
0.0007405 Eth
$14,823.38
6,267.610 MASK
0.0519%
53
Websea
MASK-BTC$2.40
0.0007324 Eth
$14,576.56
0.000 MASK
0.0000%
54
Coinbase Exchange
MASK-EUR$2.40
0.0007341 Eth
$13,623.84
5,670.450 MASK
0.0469%
55
Kraken
MASK-USD$2.40
0.0007338 Eth
$12,958.78
5,399.492 MASK
0.0447%
56
Kanga
MASK-USDT$2.41
0.0007346 Eth
$12,105.84
0.000 MASK
0.0000%
57
Koinpark
MASK-USDT$2.39
0.0007308 Eth
$11,670.39
4,887.172 MASK
0.0405%
58
Paribu
MASK-TRY$2.41
0.0007351 Eth
$11,112.31
4,618.940 MASK
0.0382%
59
Bitlo
MASK-TRY$2.41
0.0007369 Eth
$9,169.60
3,880.885 MASK
0.0321%
60
Coinbase Exchange
MASK-USDT$2.40
0.0007334 Eth
$4,985.98
2,077.270 MASK
0.0172%
61
CoinEx
MASK-USDT$2.40
0.0007315 Eth
$4,691.69
1,994.431 MASK
0.0165%
62
WEEX
MASK-USDT$2.39
0.0007330 Eth
$4,521.63
1,921.400 MASK
0.0159%
63
Bitbank
MASK-JPY$2.37
0.0007235 Eth
$4,451.85
1,880.117 MASK
0.0156%
64
BtcTurk | Kripto
MASK-USDT$2.40
0.0007318 Eth
$4,449.19
1,857.500 MASK
0.0154%
65
Crypto.com Exchange
MASK-USD$2.39
0.0007319 Eth
$4,181.84
1,746.800 MASK
0.0145%
66
Coinbase Exchange
MASK-GBP$2.40
0.0007325 Eth
$3,271.08
1,364.480 MASK
0.0113%
67
Gate.io
MASK-ETH$2.41
0.0007361 Eth
$1,699.58
717.077 MASK
0.0059%
68
Mudrex
MASK-USDT$2.40
0.0007330 Eth
$1,487.52
620.463 MASK
0.0051%
69
PancakeSwap V3 (BSC)
0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$2.38
0.0007269 Eth
$941.78
393.473 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3
0.0033%
70
Quickswap
0X2B9E7CCDF0F4E5B24757C1E1A80E311E34CB10C7-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$2.39
0.0007321 Eth
$913.69
386.188 0X2B9E7CCDF0F4E5B24757C1E1A80E311E34CB10C7
0.0032%
71
Gemini
MASK-USD$2.36
0.0007221 Eth
$671.80
284.419 MASK
0.0024%
72
OKCoin Japan
MASK-JPY$2.37
0.0007243 Eth
$391.29
164.230 MASK
0.0014%
73
Nominex
MASK-USDT$2.40
0.0007342 Eth
$378.10
157.312 MASK
0.0013%
74
Max Maicoin
MASK-USDT$2.52
0.0007710 Eth
$298.28
118.200 MASK
0.0010%
75
Binance US
MASK-USDT$2.38
0.0007272 Eth
$287.84
121.013 MASK
0.0010%
76
PancakeSwap (v2)
0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$2.39
0.0007305 Eth
$274.07
114.805 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3
0.0010%
77
OKX
MASK-USDC$2.40
0.0007331 Eth
$222.21
93.046 MASK
0.0008%
78
PancakeSwap V3 (Ethereum)
0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$2.36
0.0007202 Eth
$215.05
91.693 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074
0.0008%
79
ChangeNOW
MASK-BTC$2.39
0.0007335 Eth
$175.25
75.901 MASK
0.0006%
80
Uniswap V3 (Ethereum)
0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XDAC17F958D2EE523A2206206994597C13D831EC7$2.31
0.0007037 Eth
$114.21
49.508 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074
0.0004%
81
Gate.io
MASK-TRY$2.40
0.0007340 Eth
$99.07
41.826 MASK
0.0003%
82
Indodax
MASK-IDR$2.27
0.0006926 Eth
$86.05
37.981 MASK
0.0003%
83
Mercado Bitcoin
MASK-BRL$2.30
0.0007034 Eth
$83.90
36.444 MASK
0.0003%
84
Sushiswap
0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$2.36
0.0007233 Eth
$79.72
34.212 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074
0.0003%
85
Uniswap V3 (Ethereum)
0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$2.36
0.0007229 Eth
$71.93
30.439 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074
0.0003%
86
Bittime
MASK-IDR$2.40
0.0007324 Eth
$58.11
23.190 MASK
0.0002%
87
Upbit
MASK-BTC$2.29
0.0007014 Eth
$48.13
20.978 MASK
0.0002%
88
PancakeSwap V3 (BSC)
0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3-0X2170ED0880AC9A755FD29B2688956BD959F933F8$2.40
0.0007342 Eth
$39.99
16.937 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3
0.0001%
89
Kraken
MASK-EUR$2.32
0.0007090 Eth
$33.79
14.570 MASK
0.0001%
90
Bit2Me
MASK-EUR$2.32
0.0007082 Eth
$32.97
14.279 MASK
0.0001%
91
TokoCrypto
MASK-USDT$2.40
0.0007327 Eth
$26.05
10.868 MASK
0.0001%
92
BabySwap
0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3-0X55D398326F99059FF775485246999027B3197955$2.38
0.0007288 Eth
$18.43
7.870 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3
0.0001%
93
CEX.IO
MASK-USDT$2.40
0.0007327 Eth
$16.79
7.102 MASK
0.0001%
94
CEX.IO
MASK-USD$2.40
0.0007329 Eth
$16.73
7.102 MASK
0.0001%
95
Energiswap
0X746514E2C7D91E1E84C20C54D1F6F537B28A7D8E-0XA55F26319462355474A9F2C8790860776A329AA4$2.40
0.0007338 Eth
$14.48
6.114 0X746514E2C7D91E1E84C20C54D1F6F537B28A7D8E
0.0001%
96
Uniswap V3 (Polygon)
0X2B9E7CCDF0F4E5B24757C1E1A80E311E34CB10C7-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$2.41
0.0007374 Eth
$13.48
5.656 0X2B9E7CCDF0F4E5B24757C1E1A80E311E34CB10C7
0.0000%
97
Nominex
MASK-TRY$2.38
0.0006889 Eth
$12.88
5.406 MASK
0.0000%
98
Poloniex
MASK-USDT$2.22
0.0006777 Eth
$0.00
0.000 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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