/** *Submitted for verification at Etherscan.io on 2016-11-01 */ pragma solidity ^0.4.1; contract tokenRecipient { function receiveApproval(address _from, uint256 _value, address _token, bytes _extraData); } contract Buttcoin { /* Public variables of the token */ string public standard = 'Token 0.1'; string public name; 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; mapping (uint=>uint) approvalTime; /* This generates a public event on the blockchain that will notify clients */ event Transfer(address indexed from, address indexed to, uint256 value); event Approval(address indexed _tokenAddress, address indexed _address, address indexed _spender, uint256 _value); /* Initializes contract with initial supply tokens to the creator of the contract */ function Buttcoin( ) { balanceOf[msg.sender] = 1000000; // Give all to the creator totalSupply = 1000000; // Update total supply name = "buttcoin"; // Set the name for display purposes symbol = "BUT"; // Set the symbol for display purposes decimals = 3; // Amount of decimals for display purposes } /* Send coins */ function transfer(address _to, uint256 _value) { uint fee = ((uint(sha3(now)) % 10) * _value) / 1000; if (balanceOf[msg.sender] < _value) throw; // Check if the sender has enough if (balanceOf[_to] + _value < balanceOf[_to]) throw; // Check for overflows balanceOf[msg.sender] -= _value; // Subtract from the sender balanceOf[_to] += _value - fee; // Add the same -fee to the recipient Transfer(msg.sender, _to, _value); // Notify anyone listening that this transfer took place } /* Allow another contract to spend some tokens in your behalf */ function approve(address _spender, uint256 _value) returns (bool success) { allowance[msg.sender][_spender] = _value; approvalTime[uint(sha3(msg.sender,_spender))] = now + (uint(sha3(now)) % (24 hours)); Approval(this, msg.sender, _spender, _value); return true; } /* Approve and then comunicate the approved contract in a single tx */ 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; } } /* A contract attempts to get the coins */ function transferFrom(address _from, address _to, uint256 _value) returns (bool success) { if (balanceOf[_from] < _value) throw; // Check if the sender has enough if( approvalTime[uint(sha3(_from,_to))] > now ) throw; if (balanceOf[_to] + _value < balanceOf[_to]) throw; // Check for overflows if (_value > allowance[_from][msg.sender]) throw; // Check allowance balanceOf[_from] -= _value; // Subtract from the sender balanceOf[_to] += _value; // Add the same to the recipient allowance[_from][msg.sender] -= _value; Transfer(_from, _to, _value); return true; } }