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| /** | |
| *Submitted for verification at Etherscan.io on 2017-10-23 | |
| */ | |
| pragma solidity ^0.4.13; | |
| contract owned { | |
| address public owner; | |
| function owned() { | |
| owner = msg.sender; | |
| } | |
| modifier onlyOwner { | |
| require(msg.sender == owner); | |
| _; | |
| } | |
| function transferOwnership(address newOwner) onlyOwner { | |
| owner = newOwner; | |
| } | |
| } | |
| contract tokenRecipient { function receiveApproval(address from, uint256 value, address token, bytes extraData); } | |
| contract token { | |
| // Public variables of the token / | |
| string public name = 'CTB'; | |
| string public symbol; | |
| uint8 public decimals; | |
| uint256 public totalSupply; | |
| /* This creates an array with all balances */ | |
| mapping (address => uint256) public balanceOf; | |
| mapping (address => mapping (address => uint256)) public allowance; | |
| /* This generates a public event on the blockchain that will notify clients */ | |
| event Transfer(address indexed from, address indexed to, uint256 value); | |
| /* This notifies clients about the amount burnt */ | |
| event Burn(address indexed from, uint256 value); | |
| /* Initializes contract with initial supply tokens to the creator of the contract */ | |
| function token( | |
| uint256 initialSupply, | |
| string tokenName, | |
| uint8 decimalUnits, | |
| string tokenSymbol | |
| ) { | |
| balanceOf[msg.sender] = initialSupply; // Give the creator all initial tokens | |
| totalSupply = initialSupply; // Update total supply | |
| name = tokenName; // Set the name for display purposes | |
| symbol = tokenSymbol; // Set the symbol for display purposes | |
| decimals = decimalUnits; // Amount of decimals for display purposes | |
| } | |
| /* Internal transfer, only can be called by this contract */ | |
| function _transfer(address _from, address _to, uint _value) internal { | |
| require (_to != 0x0); // Prevent transfer to 0x0 address. Use burn() instead | |
| require (balanceOf[_from] > _value); // Check if the sender has enough | |
| require (balanceOf[_to] + _value > balanceOf[_to]); // Check for overflows | |
| balanceOf[_from] -= _value; // Subtract from the sender | |
| balanceOf[_to] += _value; // Add the same to the recipient | |
| Transfer(_from, _to, _value); | |
| } | |
| /// @notice Send `_value` tokens to `_to` from your account | |
| /// @param _to The address of the recipient | |
| /// @param _value the amount to send | |
| function transfer(address _to, uint256 _value) { | |
| _transfer(msg.sender, _to, _value); | |
| } | |
| /// @notice Send `_value` tokens to `_to` in behalf of `_from` | |
| /// @param _from The address of the sender | |
| /// @param _to The address of the recipient | |
| /// @param _value the amount to send | |
| function transferFrom(address _from, address _to, uint256 _value) returns (bool success) { | |
| require (_value < allowance[_from][msg.sender]); // Check allowance | |
| allowance[_from][msg.sender] -= _value; | |
| _transfer(_from, _to, _value); | |
| return true; | |
| } | |
| /// @notice Allows `_spender` to spend no more than `_value` tokens in your behalf | |
| /// @param _spender The address authorized to spend | |
| /// @param _value the max amount they can spend | |
| function approve(address _spender, uint256 _value) | |
| returns (bool success) { | |
| allowance[msg.sender][_spender] = _value; | |
| return true; | |
| } | |
| /// @notice Allows `_spender` to spend no more than `_value` tokens in your behalf, and then ping the contract about it | |
| /// @param _spender The address authorized to spend | |
| /// @param _value the max amount they can spend | |
| /// @param _extraData some extra information to send to the approved contract | |
| function approveAndCall(address _spender, uint256 _value, bytes _extraData) | |
| returns (bool success) { | |
| tokenRecipient spender = tokenRecipient(_spender); | |
| if (approve(_spender, _value)) { | |
| spender.receiveApproval(msg.sender, _value, this, _extraData); | |
| return true; | |
| } | |
| } | |
| /// @notice Remove `_value` tokens from the system irreversibly | |
| /// @param _value the amount of money to burn | |
| function burn(uint256 _value) returns (bool success) { | |
| require (balanceOf[msg.sender] > _value); // Check if the sender has enough | |
| balanceOf[msg.sender] -= _value; // Subtract from the sender | |
| totalSupply -= _value; // Updates totalSupply | |
| Burn(msg.sender, _value); | |
| return true; | |
| } | |
| function burnFrom(address _from, uint256 _value) returns (bool success) { | |
| require(balanceOf[_from] >= _value); // Check if the targeted balance is enough | |
| require(_value <= allowance[_from][msg.sender]); // Check allowance | |
| balanceOf[_from] -= _value; // Subtract from the targeted balance | |
| allowance[_from][msg.sender] -= _value; // Subtract from the sender's allowance | |
| totalSupply -= _value; // Update totalSupply | |
| Burn(_from, _value); | |
| return true; | |
| } | |
| } | |
| contract CTB is owned, token { | |
| uint256 public sellPrice; | |
| uint256 public buyPrice; | |
| mapping (address => bool) public frozenAccount; | |
| /* This generates a public event on the blockchain that will notify clients */ | |
| event FrozenFunds(address target, bool frozen); | |
| /* Initializes contract with initial supply tokens to the creator of the contract */ | |
| function CTB( | |
| uint256 initialSupply, | |
| string tokenName, | |
| uint8 decimalUnits, | |
| string tokenSymbol | |
| ) token (initialSupply, tokenName, decimalUnits, tokenSymbol) {} | |
| /* Internal transfer, only can be called by this contract */ | |
| function _transfer(address _from, address _to, uint _value) internal { | |
| require (_to != 0x0); // Prevent transfer to 0x0 address. Use burn() instead | |
| require (balanceOf[_from] > _value); // Check if the sender has enough | |
| require (balanceOf[_to] + _value > balanceOf[_to]); // Check for overflows | |
| require(!frozenAccount[_from]); // Check if sender is frozen | |
| require(!frozenAccount[_to]); // Check if recipient is frozen | |
| balanceOf[_from] -= _value; // Subtract from the sender | |
| balanceOf[_to] += _value; // Add the same to the recipient | |
| Transfer(_from, _to, _value); | |
| } | |
| /// @notice Create `mintedAmount` tokens and send it to `target` | |
| /// @param target Address to receive the tokens | |
| /// @param mintedAmount the amount of tokens it will receive | |
| function mintToken(address target, uint256 mintedAmount) onlyOwner { | |
| balanceOf[target] += mintedAmount; | |
| totalSupply += mintedAmount; | |
| Transfer(0, this, mintedAmount); | |
| Transfer(this, target, mintedAmount); | |
| } | |
| /// @notice `freeze? Prevent | Allow` `target` from sending & receiving tokens | |
| /// @param target Address to be frozen | |
| /// @param freeze either to freeze it or not | |
| function freezeAccount(address target, bool freeze) onlyOwner { | |
| frozenAccount[target] = freeze; | |
| FrozenFunds(target, freeze); | |
| } | |
| /// @notice Allow users to buy tokens for `newBuyPrice` eth and sell tokens for `newSellPrice` eth | |
| /// @param newSellPrice Price the users can sell to the contract | |
| /// @param newBuyPrice Price users can buy from the contract | |
| function setPrices(uint256 newSellPrice, uint256 newBuyPrice) onlyOwner { | |
| sellPrice = newSellPrice; | |
| buyPrice = newBuyPrice; | |
| } | |
| /// @notice Buy tokens from contract by sending ether | |
| function buy() payable { | |
| uint amount = msg.value / buyPrice; // calculates the amount | |
| _transfer(this, msg.sender, amount); // makes the transfers | |
| } | |
| /// @notice Sell `amount` tokens to contract | |
| /// @param amount amount of tokens to be sold | |
| function sell(uint256 amount) { | |
| require(this.balance >= amount * sellPrice); // checks if the contract has enough ether to buy | |
| _transfer(msg.sender, this, amount); // makes the transfers | |
| msg.sender.transfer(amount * sellPrice); // sends ether to the seller. It's important to do this last to avoid recursion attacks | |
| } | |
| } |