Ethereum Cookbook

How to do it…

1. The standard handles the token transfers to a contract address. Follow this standard to create a function that will reject the transaction if the receiving contract does not support such functionality.
2. The standard modifies the transfer function to include an additional data field. It also keeps the regular transfer function for backward compatibility. Use the following interface to implement a minimal ERC223 standard token:

pragma solidity ^0.4.23; contract ERC223Interface {     uint public totalSupply;     function balanceOf(address who) view returns (uint);     function transfer(address to, uint value) public;     function transfer(address to, uint value, bytes data) public;  event Transfer(address indexed from, address indexed to, ...