Theta Smart Contracts | ThetaScan.io

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Published Contract:

pragma solidity ^0.4.26; // compiled with: v0.4.24+commit.e67f0147

/**
 * @dev Interface of the ERC20 standard as defined in the EIP. Does not include
 * the optional functions; to access them see `ERC20Detailed`.
 */
interface IERC20 {
 function totalSupply() external view returns (uint256);

 function balanceOf(address account) external view returns (uint256);

 function transfer(address recipient, uint256 amount) external returns (bool);

 function allowance(address owner, address spender) external view returns (uint256);

 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);
}

library SafeMath {
 /**
 * @dev Returns the addition of two unsigned integers, reverting on
 * overflow.
 *
 * Counterpart to Solidity9s `+` 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 Solidity9s `-` operator.
 *
 * Requirements:
 * - Subtraction cannot overflow.
 */
 function sub(uint256 a, uint256 b) internal pure returns (uint256) {
 require(b <= a, "SafeMath: subtraction overflow");
 uint256 c = a - b;

 return c;
 }

 /**
 * @dev Returns the multiplication of two unsigned integers, reverting on
 * overflow.
 *
 * Counterpart to Solidity9s `*` operator.
 *
 * Requirements:
 * - Multiplication cannot overflow.
 */
 function mul(uint256 a, uint256 b) internal pure returns (uint256) {
 // Gas optimization: this is cheaper than requiring 9a9 not being zero, but the
 // benefit is lost if 9b9 is also tested.
 // See: https://github.com/OpenZeppelin/openzeppelin-solidity/pull/522
 if (a == 0) {
 return 0;
 }

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

 return c;
 }

 /**
 * @dev Returns the integer division of two unsigned integers. Reverts on
 * division by zero. The result is rounded towards zero.
 *
 * Counterpart to Solidity9s `/` 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) {
 // Solidity only automatically asserts when dividing by 0
 require(b > 0, "SafeMath: division by zero");
 uint256 c = a / b;
 // assert(a == b * c + a % b); // There is no case in which this doesn9t hold

 return c;
 }

 /**
 * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
 * Reverts when dividing by zero.
 *
 * Counterpart to Solidity9s `%` 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 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 `ERC20Mintable`.
 *
 * *For a detailed writeup see our guide [How to implement supply
 * mechanisms](https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226).*
 *
 * 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 isn9t 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 IERC20 {
 using SafeMath for uint256;

 mapping (address => uint256) private _balances;

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

 // NOTE Start of https://github.com/OpenZeppelin/openzeppelin-solidity/blob/v2.3.0/contracts/token/ERC20/ERC20Detailed.sol
 string private _name;
 string private _symbol;
 uint8 private _decimals;

 constructor () public {
 _name = "PotatoCoin";
 _symbol = "SPUD";
 _decimals = 10;

 _mint(msg.sender, 10000000000 * 10 ** uint256(_decimals)); // CAUTION!
 }

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

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

 /**
 * @dev Returns the number of decimals used to get its user representation.
 * For example, if `decimals` equals `2`, a balance of `505` tokens should
 * be displayed to a user as `5,05` (`505 / 10 ** 2`).
 *
 * Tokens usually opt for a value of 18, imitating the relationship between
 * Ether and Wei.
 *
 * > Note that this information is only used for _display_ purposes: it in
 * no way affects any of the arithmetic of the contract, including
 * `IERC20.balanceOf` and `IERC20.transfer`.
 */
 function decimals() public view returns (uint8) {
 return _decimals;
 }
 // NOTE End of https://github.com/OpenZeppelin/openzeppelin-solidity/blob/v2.3.0/contracts/token/ERC20/ERC20Detailed.sol

 uint256 private _totalSupply;

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

 /**
 * @dev See `IERC20.balanceOf`.
 */
 function balanceOf(address account) public view 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 returns (bool) {
 _transfer(msg.sender, recipient, amount);
 return true;
 }

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

 /**
 * @dev See `IERC20.approve`.
 *
 * Requirements:
 *
 * - `spender` cannot be the zero address.
 */
 function approve(address spender, uint256 value) public returns (bool) {
 _approve(msg.sender, spender, value);
 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 `value`.
 * - the caller must have allowance for `sender`9s tokens of at least
 * `amount`.
 */
 function transferFrom(address sender, address recipient, uint256 amount) public returns (bool) {
 _transfer(sender, recipient, amount);
 _approve(sender, msg.sender, _allowances[sender][msg.sender].sub(amount));
 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 returns (bool) {
 _approve(msg.sender, spender, _allowances[msg.sender][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 returns (bool) {
 _approve(msg.sender, spender, _allowances[msg.sender][spender].sub(subtractedValue));
 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 {
 require(sender != address(0), "ERC20: transfer from the zero address");
 require(recipient != address(0), "ERC20: transfer to the zero address");

 _balances[sender] = _balances[sender].sub(amount);
 _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 {
 require(account != address(0), "ERC20: mint to the zero address");

 _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 value) internal {
 require(account != address(0), "ERC20: burn from the zero address");

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

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

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

 /**
 * @dev Destoys `amount` tokens from `account`.`amount` is then deducted
 * from the caller9s allowance.
 *
 * See `_burn` and `_approve`.
 */
 function _burnFrom(address account, uint256 amount) internal {
 _burn(account, amount);
 _approve(account, msg.sender, _allowances[account][msg.sender].sub(amount));
 }
}

Contract ABI:

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