This pseudo-standard would allow data consumers such as markets, rarity sites, tools, etc to automatically determine whether a mint is in an unrevealed state.
Creators and launchpads can denote an unrevealed mint by appending #h to the on-chain metadata URI.
I.e. the metadata URI:
https://bafybeiazvwml2lk5crhil2xr4xak52kj3yqujuuabpow7ykqq2d25ruvmm.ipfs.nftstorage.link/0.json
Would become:
https://bafybeiazvwml2lk5crhil2xr4xak52kj3yqujuuabpow7ykqq2d25ruvmm.ipfs.nftstorage.link/0.json#h
By embedding the unrevealed state in the metadata URI, data consumers can quickly make decisions about whether to process a mint without fetching the external metadata JSON.
The marker is automatically removed once the on-chain metadata URI is updated to reveal the mint.