DN404: DIVISIBLE NFT STANDARD

Summary from the TLDR Crypto newsletter

The latest ERC404 meta, dubbed the "Divisible NFT" standard, or DN404, is a promising hybrid of ERC20/721 tokens. Unlike its predecessor ERC404, DN404 operates with two contracts allowing for actions as both fungible and non-fungible tokens without breaching any standards. A concept for this standard is available in an open source repo but it has not been audited yet.