ERC 20 Tokens Are Fungible

The value use case of bit coin is fungible. I don't care which bit coin i get, they're all the same. So too with tokens on the etherean block chain that represent agital currencies. Any digital asset faces the same challenges. If it's easily copd copiable, i have no way of proving that i have the real thing without an intermediary. And if it's mediated by a third party, it's ubject to change. Nft solved that problem by leveraging the block chain to prove ownership and authenticity of rare digital items. But if web three and digital worlds are going to replicate the physical world, we need a way to prove ownership of unique and