The old ERC20 token standard have bugs and disadvantages resulting in thousands of ERC20 tokens to be lost annually. These design mistakes has been addressed in the new ERC223 token which is fully compatible with ERC20 wallets and exchanges.
What is ERC?
ERC means Ethereum Request for Comments. It practically allows for smart contracts to be built on the Ethereum platform based on certain standards thus creating a common interface for all Ethereum tokens. Ethereum developers recommend that any Ethereum developer who wants to create a new token should follow this set of standards to ensure that their tokens are easily recognizable on both the Ethereum network and other third-party service providers such as crypto-wallets. These ERC20 tokens can be received, and sent just like any other cryptocurrency like Bitcoin, Litecoin and Ethereum.
ERC20 bugs
The ERC20 standard is programmed software and accordingly contains some bugs and logic errors. Two different ways to handle tokens were taken into account in the creation. On the one hand, tokens can be sent to another address. A smart contract is paid by using the “approve” and “transferFrom” functions. Thereafter, the contract may be approved to allow the tokens to be withdrawn. Afterwards the token is filled or lifted by means of “transferFrom”.
When transferring tokens for a contract with “transferFrom” this transaction is basically valid. However, the contract does not recognize it by the user, resulting in the tokens not being loaded into your account. Normally, an emergency token function is stored in the exchange contract (decentralized). If this is not the case, the tokens can not be returned and are lost forever.
ERC223 advantages
You can find more about ERC 20 bugs, ERC223 standard and its advantages at Cryptor Trust
Geir Solem