Overview
Max Total Supply
71,928,719,896.684091 USDT
Holders
6,498,221 ( 0.024%)
Market
Price
$1.00 @ 0.000254 ETH (+0.11%)
Onchain Market Cap
$72,000,648,616.58
Circulating Supply Market Cap
$135,810,886,045.00
Other Info
Token Contract (WITH 6 Decimals)
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# | Exchange | Pair | Price | 24H Volume | % Volume |
---|---|---|---|---|---|
1 | Binance | BTC-USDT | $1.001 0.0002545 Eth | $8,523,879,472.00 85,261.334 BTC | 0.0000% |
2 | Pionex | BTC-USDT | $1.001 0.0002546 Eth | $6,006,348,214.00 60,215.348 BTC | 0.0000% |
3 | BVOX | BTC-USDT | $1.001 0.0002546 Eth | $5,967,471,320.00 59,766.646 BTC | 0.0000% |
4 | CoinW | BTC-USDT | $1.001 0.0002552 Eth | $5,426,402,155.00 52,988.240 BTC | 0.0000% |
5 | Ourbit | BTC-USDT | $1.001 0.0002547 Eth | $5,221,264,300.00 52,216.426 BTC | 0.0000% |
6 | Toobit | BTC-USDT | $1.001 0.0002546 Eth | $4,118,008,039.00 41,267.995 BTC | 0.0000% |
7 | Binance | ETH-USDT | $1.001 0.0002548 Eth | $4,059,181,563.00 1,060,706.942 ETH | 0.0000% |
8 | Bybit | BTC-USDT | $1.001 0.0002545 Eth | $3,981,594,339.00 40,012.133 BTC | 0.0000% |
9 | DigiFinex | BTC-USDT | $1.001 0.0002545 Eth | $3,451,684,159.00 33,678.945 BTC | 0.0000% |
10 | Binance | XRP-USDT | $1.001 0.0002546 Eth | $3,371,091,104.00 1,413,101,688.000 XRP | 0.0020% |
11 | WEEX | BTC-USDT | $1.001 0.0002549 Eth | $3,215,076,274.00 31,386.122 BTC | 0.0000% |
12 | BitMart | BTC-USDT | $1.001 0.0002546 Eth | $3,124,185,153.00 30,498.831 BTC | 0.0000% |
13 | MEXC | BTC-USDT | $1.001 0.0002549 Eth | $3,064,722,306.00 29,901.561 BTC | 0.0000% |
14 | Binance | DOGE-USDT | $1.001 0.0002545 Eth | $2,752,584,048.00 6,380,907,205.000 DOGE | 0.0090% |
15 | Pionex | ETH-USDT | $1.001 0.0002552 Eth | $2,733,583,954.00 714,553.013 ETH | 0.0000% |
16 | Hotcoin | BTC-USDT | $1.001 0.0002547 Eth | $2,652,109,379.00 25,888.660 BTC | 0.0000% |
17 | Toobit | ETH-USDT | $1.001 0.0002546 Eth | $2,602,584,087.00 679,942.521 ETH | 0.0000% |
18 | Bitunix | BTC-USDT | $1.001 0.0002548 Eth | $2,395,838,850.00 23,397.404 BTC | 0.0000% |
19 | Bitget | BTC-USDT | $1.001 0.0002545 Eth | $2,219,154,439.00 22,223.316 BTC | 0.0000% |
20 | OKX | BTC-USDT | $1.001 0.0002545 Eth | $2,157,783,250.00 21,643.162 BTC | 0.0000% |
21 | LBank | BTC-USDT | $1.001 0.0002545 Eth | $2,079,191,485.00 20,292.744 BTC | 0.0000% |
22 | WhiteBIT | BTC-USDT | $1.001 0.0002546 Eth | $1,929,427,139.00 18,837.487 BTC | 0.0000% |
23 | BitMart | ETH-USDT | $1.001 0.0002546 Eth | $1,890,520,512.00 480,458.632 ETH | 0.0000% |
24 | MEXC | ETH-USDT | $1.001 0.0002546 Eth | $1,869,451,755.00 475,175.243 ETH | 0.0000% |
25 | BVOX | ETH-USDT | $1.001 0.0002546 Eth | $1,788,929,802.00 467,500.519 ETH | 0.0000% |
26 | WEEX | ETH-USDT | $1.001 0.0002548 Eth | $1,786,360,280.00 467,060.195 ETH | 0.0000% |
27 | Bybit | ETH-USDT | $1.001 0.0002545 Eth | $1,691,507,140.00 441,330.597 ETH | 0.0000% |
28 | P2B | BTC-USDT | $1.001 0.0002546 Eth | $1,665,103,889.00 16,254.363 BTC | 0.0000% |
29 | Binance | FDUSD-USDT | $1.001 0.0002545 Eth | $1,634,248,081.00 1,635,639,026.000 FDUSD | 0.0023% |
30 | Bitget | ETH-USDT | $1.001 0.0002545 Eth | $1,555,513,209.00 405,771.636 ETH | 0.0000% |
31 | DigiFinex | ETH-USDT | $1.001 0.0002545 Eth | $1,492,500,980.00 378,997.351 ETH | 0.0000% |
32 | Binance | SOL-USDT | $1.001 0.0002545 Eth | $1,348,889,112.00 5,801,188.449 SOL | 0.0000% |
33 | CoinW | ETH-USDT | $1.001 0.0002549 Eth | $1,330,403,357.00 338,770.007 ETH | 0.0000% |
34 | Binance | TRX-USDT | $1.001 0.0002552 Eth | $1,324,970,758.00 3,923,484,466.900 TRX | 0.0056% |
35 | OKX | ETH-USDT | $1.001 0.0002545 Eth | $1,218,768,220.00 318,001.148 ETH | 0.0000% |
36 | Binance | BNB-USDT | $1.001 0.0002546 Eth | $1,147,829,816.00 1,558,138.602 BNB | 0.0000% |
37 | Bybit | XRP-USDT | $1.001 0.0002545 Eth | $1,111,077,782.00 466,303,733.120 XRP | 0.0007% |
38 | Ourbit | ETH-USDT | $1.001 0.0002547 Eth | $1,073,726,718.00 280,577.906 ETH | 0.0000% |
39 | Binance | PEPE-USDT | $1.001 0.0002545 Eth | $1,055,617,326.00 49,357,939,805,985.000 PEPE | 69.8506% |
40 | BigONE | BTC-USDT | $1.001 0.0002547 Eth | $1,024,808,260.00 10,001.869 BTC | 0.0000% |
41 | LATOKEN | BTC-USDT | $1.001 0.0002548 Eth | $1,017,699,691.00 9,935.097 BTC | 0.0000% |
42 | AscendEX (BitMax) | BTC-USDT | $1.001 0.0002546 Eth | $978,214,184.00 9,548.830 BTC | 0.0000% |
43 | Bitunix | ETH-USDT | $1.001 0.0002548 Eth | $977,902,416.00 248,790.355 ETH | 0.0000% |
44 | OKX | DOGE-USDT | $1.001 0.0002545 Eth | $973,357,203.00 2,255,455,890.662 DOGE | 0.0032% |
45 | Bitget | XRP-USDT | $1.001 0.0002545 Eth | $901,384,958.00 378,097,690.578 XRP | 0.0005% |
46 | HTX | BTC-USDT | $1.001 0.0002546 Eth | $900,387,206.00 9,051.980 BTC | 0.0000% |
47 | Gate.io | BTC-USDT | $1.001 0.0002545 Eth | $744,920,100.00 7,464.256 BTC | 0.0000% |
48 | WhiteBIT | ETH-USDT | $1.001 0.0002547 Eth | $739,014,530.00 187,782.296 ETH | 0.0000% |
49 | Gate.io | ETH-USDT | $1.001 0.0002545 Eth | $640,444,092.00 167,334.496 ETH | 0.0000% |
50 | Gate.io | XRP-USDT | $1.001 0.0002545 Eth | $612,009,391.00 255,754,869.316 XRP | 0.0004% |
51 | LATOKEN | ETH-USDT | $1.001 0.0002547 Eth | $602,278,006.00 153,214.201 ETH | 0.0000% |
52 | Binance | SAND-USDT | $1.001 0.0002545 Eth | $600,129,810.00 633,002,146.000 SAND | 0.0009% |
53 | Binance | HBAR-USDT | $1.001 0.0002548 Eth | $600,077,517.00 2,012,028,374.000 HBAR | 0.0028% |
54 | DigiFinex | TRX-USDT | $1.001 0.0002545 Eth | $582,016,916.00 1,733,501,565.600 TRX | 0.0025% |
55 | WhiteBIT | XRP-USDT | $1.001 0.0002547 Eth | $563,540,100.00 233,763,244.010 XRP | 0.0003% |
56 | OKX | XRP-USDT | $1.001 0.0002545 Eth | $559,012,469.00 234,924,128.366 XRP | 0.0003% |
57 | Deepcoin | XRP-USDT | $1.001 0.0002546 Eth | $544,034,428.00 236,213,300.362 XRP | 0.0003% |
58 | Bitget | DOGE-USDT | $1.001 0.0002545 Eth | $542,873,666.00 1,258,762,488.883 DOGE | 0.0018% |
59 | Binance | ADA-USDT | $1.001 0.0002545 Eth | $540,742,408.00 455,141,710.800 ADA | 0.0006% |
60 | AscendEX (BitMax) | ETH-USDT | $1.001 0.0002546 Eth | $528,838,046.00 134,357.965 ETH | 0.0000% |
61 | LBank | ETH-USDT | $1.001 0.0002545 Eth | $507,726,143.00 128,980.265 ETH | 0.0000% |
62 | KuCoin | BTC-USDT | $1.001 0.0002545 Eth | $500,867,379.00 4,887.648 BTC | 0.0000% |
63 | CoinTR | BTC-USDT | $1.001 0.0002547 Eth | $498,550,237.00 5,025.537 BTC | 0.0000% |
64 | Binance | SUI-USDT | $1.001 0.0002553 Eth | $481,321,948.00 128,788,145.800 SUI | 0.0002% |
65 | Bybit | SOL-USDT | $1.001 0.0002545 Eth | $478,572,995.00 2,058,603.204 SOL | 0.0000% |
66 | Coinstore | ETH-USDT | $1.001 0.0002554 Eth | $442,414,533.00 115,533.148 ETH | 0.0000% |
67 | Gate.io | DOGE-USDT | $1.001 0.0002545 Eth | $429,687,201.00 997,762,945.040 DOGE | 0.0014% |
68 | Bitunix | XRP-USDT | $1.001 0.0002548 Eth | $427,016,862.00 176,907,184.000 XRP | 0.0003% |
69 | Bitunix | DOGE-USDT | $1.001 0.0002548 Eth | $404,052,277.00 905,298,198.000 DOGE | 0.0013% |
70 | Binance | DOT-USDT | $1.001 0.0002552 Eth | $400,598,640.00 37,034,918.320 DOT | 0.0001% |
71 | Bybit | DOGE-USDT | $1.001 0.0002545 Eth | $376,373,904.00 872,766,043.200 DOGE | 0.0012% |
72 | Binance | RENDER-USDT | $1.001 0.0002545 Eth | $358,796,886.00 35,454,342.130 RENDER | 0.0001% |
73 | MEXC | DOGE-USDT | $1.001 0.0002545 Eth | $358,349,580.00 802,191,901.120 DOGE | 0.0011% |
74 | Biconomy.com | ETH-USDT | $1.001 0.0002554 Eth | $340,036,737.00 88,858.436 ETH | 0.0000% |
75 | WhiteBIT | DOGE-USDT | $1.001 0.0002546 Eth | $335,762,476.00 751,496,234.900 DOGE | 0.0011% |
76 | DigiFinex | DOGE-USDT | $1.001 0.0002545 Eth | $326,735,755.00 731,225,426.300 DOGE | 0.0010% |
77 | Binance | GALA-USDT | $1.001 0.0002545 Eth | $322,778,868.00 5,353,211,029.000 GALA | 0.0076% |
78 | Toobit | XRP-USDT | $1.00 0.0002550 Eth | $320,810,401.00 134,419,498.000 XRP | 0.0002% |
79 | Binance | AVAX-USDT | $1.001 0.0002545 Eth | $320,627,647.00 6,054,069.800 AVAX | 0.0000% |
80 | Binance | PNUT-USDT | $1.001 0.0002545 Eth | $320,285,245.00 251,543,140.900 PNUT | 0.0004% |
81 | HTX | ETH-USDT | $1.001 0.0002546 Eth | $315,910,629.00 82,556.841 ETH | 0.0000% |
82 | OKX | SOL-USDT | $1.001 0.0002545 Eth | $302,921,291.00 1,301,057.403 SOL | 0.0000% |
83 | WhiteBIT | SOL-USDT | $1.001 0.0002547 Eth | $297,419,256.00 1,240,472.965 SOL | 0.0000% |
84 | KuCoin | XRP-USDT | $1.001 0.0002545 Eth | $280,541,126.00 116,509,666.219 XRP | 0.0002% |
85 | Binance | FIL-USDT | $1.001 0.0002545 Eth | $272,569,226.00 33,812,988.210 FIL | 0.0000% |
86 | KuCoin | ETH-USDT | $1.001 0.0002545 Eth | $267,911,280.00 68,051.263 ETH | 0.0000% |
87 | Gate.io | PEPE-USDT | $1.001 0.0002546 Eth | $266,942,237.00 12,516,410,477,607.000 PEPE | 17.7130% |
88 | Deepcoin | SOL-USDT | $1.00 0.0002553 Eth | $255,698,504.00 1,108,884.759 SOL | 0.0000% |
89 | HTX | DOGE-USDT | $1.001 0.0002546 Eth | $240,161,322.00 562,315,842.348 DOGE | 0.0008% |
90 | Binance | NEIRO-USDT | $1.001 0.0002550 Eth | $239,813,880.00 137,153,769,392.000 NEIRO | 0.1941% |
91 | WEEX | SOL-USDT | $1.001 0.0002547 Eth | $227,053,755.00 979,154.583 SOL | 0.0000% |
92 | WhiteBIT | TRX-USDT | $1.001 0.0002546 Eth | $225,424,104.00 671,019,763.540 TRX | 0.0009% |
93 | Deepcoin | DOGE-USDT | $1.001 0.0002546 Eth | $222,414,726.00 510,427,806.916 DOGE | 0.0007% |
94 | Binance | ENA-USDT | $1.001 0.0002545 Eth | $210,240,744.00 226,767,989.240 ENA | 0.0003% |
95 | Binance | NEAR-USDT | $1.001 0.0002545 Eth | $207,385,830.00 27,777,673.000 NEAR | 0.0000% |
96 | WhiteBIT | SUI-USDT | $1.001 0.0002545 Eth | $188,722,475.00 48,862,688.529 SUI | 0.0001% |
97 | WhiteBIT | PEPE-USDT | $1.001 0.0002546 Eth | $187,919,337.00 8,613,626,580,957.000 PEPE | 12.1899% |
98 | CoinEx | BTC-USDT | $1.001 0.0002552 Eth | $176,326,862.00 1,761.884 BTC | 0.0000% |
99 | Azbit | BTC-USDT | $1.001 0.0002546 Eth | $170,159,424.00 1,708.452 BTC | 0.0000% |
100 | WhiteBIT | ADA-USDT | $1.001 0.0002545 Eth | $168,874,896.00 137,221,986.410 ADA | 0.0002% |
Contract Name:
TetherToken
Compiler Version
v0.4.18+commit.9cf6e910
Optimization Enabled:
No with 0 runs
Other Settings:
default evmVersion, Audited
Contract Source Code (Solidity)Audit Report
/** *Submitted for verification at Etherscan.io on 2017-11-28 */ pragma solidity ^0.4.17; /** * @title SafeMath * @dev Math operations with safety checks that throw on error */ library SafeMath { function mul(uint256 a, uint256 b) internal pure returns (uint256) { if (a == 0) { return 0; } uint256 c = a * b; assert(c / a == b); return c; } function div(uint256 a, uint256 b) internal pure returns (uint256) { // assert(b > 0); // Solidity automatically throws when dividing by 0 uint256 c = a / b; // assert(a == b * c + a % b); // There is no case in which this doesn't hold return c; } function sub(uint256 a, uint256 b) internal pure returns (uint256) { assert(b <= a); return a - b; } function add(uint256 a, uint256 b) internal pure returns (uint256) { uint256 c = a + b; assert(c >= a); return c; } } /** * @title Ownable * @dev The Ownable contract has an owner address, and provides basic authorization control * functions, this simplifies the implementation of "user permissions". */ contract Ownable { address public owner; /** * @dev The Ownable constructor sets the original `owner` of the contract to the sender * account. */ function Ownable() public { owner = msg.sender; } /** * @dev Throws if called by any account other than the owner. */ modifier onlyOwner() { require(msg.sender == owner); _; } /** * @dev Allows the current owner to transfer control of the contract to a newOwner. * @param newOwner The address to transfer ownership to. */ function transferOwnership(address newOwner) public onlyOwner { if (newOwner != address(0)) { owner = newOwner; } } } /** * @title ERC20Basic * @dev Simpler version of ERC20 interface * @dev see https://github.com/ethereum/EIPs/issues/20 */ contract ERC20Basic { uint public _totalSupply; function totalSupply() public constant returns (uint); function balanceOf(address who) public constant returns (uint); function transfer(address to, uint value) public; event Transfer(address indexed from, address indexed to, uint value); } /** * @title ERC20 interface * @dev see https://github.com/ethereum/EIPs/issues/20 */ contract ERC20 is ERC20Basic { function allowance(address owner, address spender) public constant returns (uint); function transferFrom(address from, address to, uint value) public; function approve(address spender, uint value) public; event Approval(address indexed owner, address indexed spender, uint value); } /** * @title Basic token * @dev Basic version of StandardToken, with no allowances. */ contract BasicToken is Ownable, ERC20Basic { using SafeMath for uint; mapping(address => uint) public balances; // additional variables for use if transaction fees ever became necessary uint public basisPointsRate = 0; uint public maximumFee = 0; /** * @dev Fix for the ERC20 short address attack. */ modifier onlyPayloadSize(uint size) { require(!(msg.data.length < size + 4)); _; } /** * @dev transfer token for a specified address * @param _to The address to transfer to. * @param _value The amount to be transferred. */ function transfer(address _to, uint _value) public onlyPayloadSize(2 * 32) { uint fee = (_value.mul(basisPointsRate)).div(10000); if (fee > maximumFee) { fee = maximumFee; } uint sendAmount = _value.sub(fee); balances[msg.sender] = balances[msg.sender].sub(_value); balances[_to] = balances[_to].add(sendAmount); if (fee > 0) { balances[owner] = balances[owner].add(fee); Transfer(msg.sender, owner, fee); } Transfer(msg.sender, _to, sendAmount); } /** * @dev Gets the balance of the specified address. * @param _owner The address to query the the balance of. * @return An uint representing the amount owned by the passed address. */ function balanceOf(address _owner) public constant returns (uint balance) { return balances[_owner]; } } /** * @title Standard ERC20 token * * @dev Implementation of the basic standard token. * @dev https://github.com/ethereum/EIPs/issues/20 * @dev Based oncode by FirstBlood: https://github.com/Firstbloodio/token/blob/master/smart_contract/FirstBloodToken.sol */ contract StandardToken is BasicToken, ERC20 { mapping (address => mapping (address => uint)) public allowed; uint public constant MAX_UINT = 2**256 - 1; /** * @dev Transfer tokens from one address to another * @param _from address The address which you want to send tokens from * @param _to address The address which you want to transfer to * @param _value uint the amount of tokens to be transferred */ function transferFrom(address _from, address _to, uint _value) public onlyPayloadSize(3 * 32) { var _allowance = allowed[_from][msg.sender]; // Check is not needed because sub(_allowance, _value) will already throw if this condition is not met // if (_value > _allowance) throw; uint fee = (_value.mul(basisPointsRate)).div(10000); if (fee > maximumFee) { fee = maximumFee; } if (_allowance < MAX_UINT) { allowed[_from][msg.sender] = _allowance.sub(_value); } uint sendAmount = _value.sub(fee); balances[_from] = balances[_from].sub(_value); balances[_to] = balances[_to].add(sendAmount); if (fee > 0) { balances[owner] = balances[owner].add(fee); Transfer(_from, owner, fee); } Transfer(_from, _to, sendAmount); } /** * @dev Approve the passed address to spend the specified amount of tokens on behalf of msg.sender. * @param _spender The address which will spend the funds. * @param _value The amount of tokens to be spent. */ function approve(address _spender, uint _value) public onlyPayloadSize(2 * 32) { // To change the approve amount you first have to reduce the addresses` // allowance to zero by calling `approve(_spender, 0)` if it is not // already 0 to mitigate the race condition described here: // https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729 require(!((_value != 0) && (allowed[msg.sender][_spender] != 0))); allowed[msg.sender][_spender] = _value; Approval(msg.sender, _spender, _value); } /** * @dev Function to check the amount of tokens than an owner allowed to a spender. * @param _owner address The address which owns the funds. * @param _spender address The address which will spend the funds. * @return A uint specifying the amount of tokens still available for the spender. */ function allowance(address _owner, address _spender) public constant returns (uint remaining) { return allowed[_owner][_spender]; } } /** * @title Pausable * @dev Base contract which allows children to implement an emergency stop mechanism. */ contract Pausable is Ownable { event Pause(); event Unpause(); bool public paused = false; /** * @dev Modifier to make a function callable only when the contract is not paused. */ modifier whenNotPaused() { require(!paused); _; } /** * @dev Modifier to make a function callable only when the contract is paused. */ modifier whenPaused() { require(paused); _; } /** * @dev called by the owner to pause, triggers stopped state */ function pause() onlyOwner whenNotPaused public { paused = true; Pause(); } /** * @dev called by the owner to unpause, returns to normal state */ function unpause() onlyOwner whenPaused public { paused = false; Unpause(); } } contract BlackList is Ownable, BasicToken { /////// Getters to allow the same blacklist to be used also by other contracts (including upgraded Tether) /////// function getBlackListStatus(address _maker) external constant returns (bool) { return isBlackListed[_maker]; } function getOwner() external constant returns (address) { return owner; } mapping (address => bool) public isBlackListed; function addBlackList (address _evilUser) public onlyOwner { isBlackListed[_evilUser] = true; AddedBlackList(_evilUser); } function removeBlackList (address _clearedUser) public onlyOwner { isBlackListed[_clearedUser] = false; RemovedBlackList(_clearedUser); } function destroyBlackFunds (address _blackListedUser) public onlyOwner { require(isBlackListed[_blackListedUser]); uint dirtyFunds = balanceOf(_blackListedUser); balances[_blackListedUser] = 0; _totalSupply -= dirtyFunds; DestroyedBlackFunds(_blackListedUser, dirtyFunds); } event DestroyedBlackFunds(address _blackListedUser, uint _balance); event AddedBlackList(address _user); event RemovedBlackList(address _user); } contract UpgradedStandardToken is StandardToken{ // those methods are called by the legacy contract // and they must ensure msg.sender to be the contract address function transferByLegacy(address from, address to, uint value) public; function transferFromByLegacy(address sender, address from, address spender, uint value) public; function approveByLegacy(address from, address spender, uint value) public; } contract TetherToken is Pausable, StandardToken, BlackList { string public name; string public symbol; uint public decimals; address public upgradedAddress; bool public deprecated; // The contract can be initialized with a number of tokens // All the tokens are deposited to the owner address // // @param _balance Initial supply of the contract // @param _name Token Name // @param _symbol Token symbol // @param _decimals Token decimals function TetherToken(uint _initialSupply, string _name, string _symbol, uint _decimals) public { _totalSupply = _initialSupply; name = _name; symbol = _symbol; decimals = _decimals; balances[owner] = _initialSupply; deprecated = false; } // Forward ERC20 methods to upgraded contract if this one is deprecated function transfer(address _to, uint _value) public whenNotPaused { require(!isBlackListed[msg.sender]); if (deprecated) { return UpgradedStandardToken(upgradedAddress).transferByLegacy(msg.sender, _to, _value); } else { return super.transfer(_to, _value); } } // Forward ERC20 methods to upgraded contract if this one is deprecated function transferFrom(address _from, address _to, uint _value) public whenNotPaused { require(!isBlackListed[_from]); if (deprecated) { return UpgradedStandardToken(upgradedAddress).transferFromByLegacy(msg.sender, _from, _to, _value); } else { return super.transferFrom(_from, _to, _value); } } // Forward ERC20 methods to upgraded contract if this one is deprecated function balanceOf(address who) public constant returns (uint) { if (deprecated) { return UpgradedStandardToken(upgradedAddress).balanceOf(who); } else { return super.balanceOf(who); } } // Forward ERC20 methods to upgraded contract if this one is deprecated function approve(address _spender, uint _value) public onlyPayloadSize(2 * 32) { if (deprecated) { return UpgradedStandardToken(upgradedAddress).approveByLegacy(msg.sender, _spender, _value); } else { return super.approve(_spender, _value); } } // Forward ERC20 methods to upgraded contract if this one is deprecated function allowance(address _owner, address _spender) public constant returns (uint remaining) { if (deprecated) { return StandardToken(upgradedAddress).allowance(_owner, _spender); } else { return super.allowance(_owner, _spender); } } // deprecate current contract in favour of a new one function deprecate(address _upgradedAddress) public onlyOwner { deprecated = true; upgradedAddress = _upgradedAddress; Deprecate(_upgradedAddress); } // deprecate current contract if favour of a new one function totalSupply() public constant returns (uint) { if (deprecated) { return StandardToken(upgradedAddress).totalSupply(); } else { return _totalSupply; } } // Issue a new amount of tokens // these tokens are deposited into the owner address // // @param _amount Number of tokens to be issued function issue(uint amount) public onlyOwner { require(_totalSupply + amount > _totalSupply); require(balances[owner] + amount > balances[owner]); balances[owner] += amount; _totalSupply += amount; Issue(amount); } // Redeem tokens. // These tokens are withdrawn from the owner address // if the balance must be enough to cover the redeem // or the call will fail. // @param _amount Number of tokens to be issued function redeem(uint amount) public onlyOwner { require(_totalSupply >= amount); require(balances[owner] >= amount); _totalSupply -= amount; balances[owner] -= amount; Redeem(amount); } function setParams(uint newBasisPoints, uint newMaxFee) public onlyOwner { // Ensure transparency by hardcoding limit beyond which fees can never be added require(newBasisPoints < 20); require(newMaxFee < 50); basisPointsRate = newBasisPoints; maximumFee = newMaxFee.mul(10**decimals); Params(basisPointsRate, maximumFee); } // Called when new token are issued event Issue(uint amount); // Called when tokens are redeemed event Redeem(uint amount); // Called when contract is deprecated event Deprecate(address newAddress); // Called if contract ever adds fees event Params(uint feeBasisPoints, uint maxFee); }
Contract Security Audit
- Callisto Network - July 10th, 2019 - Security Audit Report
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Contract Creation Code
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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)
000000000000000000000000000000000000000000000000000000174876e800000000000000000000000000000000000000000000000000000000000000008000000000000000000000000000000000000000000000000000000000000000c00000000000000000000000000000000000000000000000000000000000000006000000000000000000000000000000000000000000000000000000000000000a546574686572205553440000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000045553445400000000000000000000000000000000000000000000000000000000
-----Decoded View---------------
Arg [0] : _initialSupply (uint256): 100000000000
Arg [1] : _name (string): Tether USD
Arg [2] : _symbol (string): USDT
Arg [3] : _decimals (uint256): 6
-----Encoded View---------------
8 Constructor Arguments found :
Arg [0] : 000000000000000000000000000000000000000000000000000000174876e800
Arg [1] : 0000000000000000000000000000000000000000000000000000000000000080
Arg [2] : 00000000000000000000000000000000000000000000000000000000000000c0
Arg [3] : 0000000000000000000000000000000000000000000000000000000000000006
Arg [4] : 000000000000000000000000000000000000000000000000000000000000000a
Arg [5] : 5465746865722055534400000000000000000000000000000000000000000000
Arg [6] : 0000000000000000000000000000000000000000000000000000000000000004
Arg [7] : 5553445400000000000000000000000000000000000000000000000000000000
Swarm Source
bzzr://645ee12d73db47fd78ba77fa1f824c3c8f9184061b3b10386beb4dc9236abb28
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