What is the difference between ERC20 and ERC 21?
I'm curious about the differences between ERC20 and ERC-21 tokens. Could you elaborate on the key distinctions between these two standards in the realm of cryptocurrency? I understand that ERC20 is a widely used token standard on the Ethereum blockchain, but I'm not quite familiar with ERC-21. Could you please explain what ERC-21 is and how it differs from ERC20? It would be helpful if you could highlight the unique features and potential use cases of ERC-21, as compared to ERC20, to give me a clearer understanding of their differences.