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- pragma solidity ^0.4.19;
- /**
- * @title ERC20Basic
- * @dev Simpler version of ERC20 interface
- * @dev see https://github.com/ethereum/EIPs/issues/179
- */
- contract ERC20Basic {
- function totalSupply() public view returns (uint256);
- function balanceOf(address who) public view returns (uint256);
- function transfer(address to, uint256 value) public returns (bool);
- event Transfer(address indexed from, address indexed to, uint256 value);
- }
- /**
- * @title ERC20 interface
- * @dev see https://github.com/ethereum/EIPs/issues/20
- */
- contract ERC20 is ERC20Basic {
- function allowance(address owner, address spender) public view returns (uint256);
- function transferFrom(address from, address to, uint256 value) public returns (bool);
- function approve(address spender, uint256 value) public returns (bool);
- event Approval(address indexed owner, address indexed spender, uint256 value);
- }
- /**
- * @title SafeMath
- * @dev Math operations with safety checks that throw on error
- */
- library SafeMath {
- /**
- * @dev Multiplies two numbers, throws on overflow.
- */
- 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;
- }
- /**
- * @dev Integer division of two numbers, truncating the quotient.
- */
- 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 a / b;
- }
- /**
- * @dev Subtracts two numbers, throws on overflow (i.e. if subtrahend is greater than minuend).
- */
- function sub(uint256 a, uint256 b) internal pure returns (uint256) {
- assert(b <= a);
- return a - b;
- }
- /**
- * @dev Adds two numbers, throws on overflow.
- */
- function add(uint256 a, uint256 b) internal pure returns (uint256) {
- uint256 c = a + b;
- assert(c >= a);
- return c;
- }
- }
- /**
- * @title Basic token
- * @dev Basic version of StandardToken, with no allowances.
- */
- contract BasicToken is ERC20Basic {
- using SafeMath for uint256;
- mapping(address => uint256) balances;
- uint256 totalSupply_;
- /**
- * @dev total number of tokens in existence
- */
- function totalSupply() public view returns (uint256) {
- return totalSupply_;
- }
- /**
- * @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, uint256 _value) public returns (bool) {
- require(_to != address(0));
- require(_value <= balances[msg.sender]);
- balances[msg.sender] = balances[msg.sender].sub(_value);
- balances[_to] = balances[_to].add(_value);
- emit Transfer(msg.sender, _to, _value);
- return true;
- }
- /**
- * @dev Gets the balance of the specified address.
- * @param _owner The address to query the the balance of.
- * @return An uint256 representing the amount owned by the passed address.
- */
- function balanceOf(address _owner) public view returns (uint256 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 on code by FirstBlood: https://github.com/Firstbloodio/token/blob/master/smart_contract/FirstBloodToken.sol
- */
- contract StandardToken is ERC20, BasicToken {
- mapping (address => mapping (address => uint256)) internal allowed;
- /**
- * @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 uint256 the amount of tokens to be transferred
- */
- function transferFrom(address _from, address _to, uint256 _value) public returns (bool) {
- require(_to != address(0));
- require(_value <= balances[_from]);
- require(_value <= allowed[_from][msg.sender]);
- balances[_from] = balances[_from].sub(_value);
- balances[_to] = balances[_to].add(_value);
- allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(_value);
- emit Transfer(_from, _to, _value);
- return true;
- }
- /**
- * @dev Approve the passed address to spend the specified amount of tokens on behalf of msg.sender.
- *
- * 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
- * @param _spender The address which will spend the funds.
- * @param _value The amount of tokens to be spent.
- */
- function approve(address _spender, uint256 _value) public returns (bool) {
- allowed[msg.sender][_spender] = _value;
- emit Approval(msg.sender, _spender, _value);
- return true;
- }
- /**
- * @dev Function to check the amount of tokens that 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 uint256 specifying the amount of tokens still available for the spender.
- */
- function allowance(address _owner, address _spender) public view returns (uint256) {
- return allowed[_owner][_spender];
- }
- /**
- * @dev Increase the amount of tokens that an owner allowed to a spender.
- *
- * approve should be called when allowed[_spender] == 0. To increment
- * allowed value is better to use this function to avoid 2 calls (and wait until
- * the first transaction is mined)
- * From MonolithDAO Token.sol
- * @param _spender The address which will spend the funds.
- * @param _addedValue The amount of tokens to increase the allowance by.
- */
- function increaseApproval(address _spender, uint _addedValue) public returns (bool) {
- allowed[msg.sender][_spender] = allowed[msg.sender][_spender].add(_addedValue);
- emit Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
- return true;
- }
- /**
- * @dev Decrease the amount of tokens that an owner allowed to a spender.
- *
- * approve should be called when allowed[_spender] == 0. To decrement
- * allowed value is better to use this function to avoid 2 calls (and wait until
- * the first transaction is mined)
- * From MonolithDAO Token.sol
- * @param _spender The address which will spend the funds.
- * @param _subtractedValue The amount of tokens to decrease the allowance by.
- */
- function decreaseApproval(address _spender, uint _subtractedValue) public returns (bool) {
- uint oldValue = allowed[msg.sender][_spender];
- if (_subtractedValue > oldValue) {
- allowed[msg.sender][_spender] = 0;
- } else {
- allowed[msg.sender][_spender] = oldValue.sub(_subtractedValue);
- }
- emit Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
- return true;
- }
- }
- /**
- * @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;
- event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
- /**
- * @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 {
- require(newOwner != address(0));
- emit OwnershipTransferred(owner, newOwner);
- owner = newOwner;
- }
- }
- contract OFC is Ownable, StandardToken {
- string public constant name = "OneCoin";
- string public constant symbol = "OFC";
- uint8 public constant decimals = 7;
- uint256 public constant INITIAL_SUPPLY = (120000 * (10**6)) * (10 ** uint256(decimals));
- constructor() public {
- totalSupply_ = INITIAL_SUPPLY;
- balances[this] = INITIAL_SUPPLY;
- emit Transfer(address(0), this, INITIAL_SUPPLY);
- }
- //sending tokens from contract address
- function send(address to, uint amount) public onlyOwner {
- require(to != address(0));
- require(amount > 0);
- // SafeMath.sub will throw if there is not enough balance.
- balances[this] = balances[this].sub(amount);
- balances[to] = balances[to].add(amount);
- emit Transfer(this, to, amount);
- }
- //mining tokens and sending to address
- function mint(address to, uint amount) public onlyOwner {
- require(to != address(0));
- require(amount > 0);
- totalSupply_ = totalSupply_.add(amount);
- balances[to] = balances[to].add(amount);
- emit Transfer(address(0), to, amount);
- }
- //burning tokens from address
- function burn(address from, uint amount) public onlyOwner {
- require(from != address(0));
- require(amount > 0);
- // SafeMath.sub will throw if there is not enough balance.
- totalSupply_ = totalSupply_.sub(amount);
- balances[from] = balances[from].sub(amount);
- emit Transfer(from, address(0), amount);
- }
- function() public payable {}
- //Sendin Ethers
- function sendEther(address to, uint amount) public onlyOwner {
- require(to != address(0));
- require(amount > 0);
- to.transfer(amount);
- }
- }
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