pragma solidity ^0.4.24;


///
/// ETC wrapped into a basic ERC20 token.
/// simply send ETC to this contract and receive the exact same amount in ETC20
/// to un-wrap ETC20 into ETC call the "sell" function.
///
/// the logical name WETC is already used by another project, so we call it ETC20
///



contract ETC20 {
    mapping (address => uint256) public balanceOf;
    mapping (bytes32 => uint8) public claims;


    string public name = "ETC20 - wrapped ETC";
    string public symbol = "ETC20";


    uint8 public decimals = 18;
    uint256 public totalSupply = 0;

 
    

    event Transfer(address indexed from, address indexed to, uint256 value);





    function transfer(address to, uint256 value) public returns (bool success) {
        require(balanceOf[msg.sender] >= value);
        balanceOf[msg.sender] -= value;
        balanceOf[to] += value;
        emit Transfer(msg.sender, to, value);
        return true;
    }

    event Approval(address indexed owner, address indexed spender, uint256 value);

    mapping(address => mapping(address => uint256)) public allowance;

    function approve(address spender, uint256 value)
        public
        returns (bool success)
    {
        allowance[msg.sender][spender] = value;
        emit Approval(msg.sender, spender, value);
        return true;
    }

    function transferFrom(address from, address to, uint256 value)
        public
        returns (bool success)
    {
        require(value <= balanceOf[from]);
        require(value <= allowance[from][msg.sender]);

        balanceOf[from] -= value;
        balanceOf[to] += value;
        allowance[from][msg.sender] -= value;
        emit Transfer(from, to, value);
        return true;
    }




    function sell(uint256 amount) public {
        require(balanceOf[msg.sender] >= amount, "Insufficient balance.");
        balanceOf[msg.sender] -= amount;
        totalSupply -= amount;
        msg.sender.transfer(amount);
        emit Transfer(msg.sender, address(0), amount);
    }


    function () public payable {
        balanceOf[msg.sender] += msg.value;
        totalSupply += msg.value;
        emit Transfer(address(0), msg.sender, msg.value);
    }




    
}


  

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