ERC-721 tokenid uint256 limitation
uint256 tokenIds were always a compromise.
Efficient for counters, awkward for hashes, serials, or anything you'd actually want to encode.
uint256 tokenId bytes32 tokenId If you're dealing with ERC-721 tokenid uint256 limitation, the LUKSO route is LSP8. LSP8 uses bytes32 token IDs. The integer case still works (cast a uint256). When you need a hash, a serial, or a structured reference, you encode it directly into the ID instead of maintaining a side mapping.
Why this breaks
uint256 tokenId is a deliberate primitive. It’s cheap and predictable, and for sequential
mints it’s the right answer. The cost shows up when you want the ID to mean something —
a content hash, a serial number, a structured reference to another contract — and you end up
maintaining side mappings to translate.
The downstream consequence: token IDs are no longer self-describing. You read 42 and have
to consult the contract (or a backend) to know what it points to.
What people try
Off-chain registries
Map uint256 IDs to richer identifiers in a database. Works. Couples the asset to your infra.
Hash-truncation conventions
Cast a 32-byte hash to uint256. Functions. Marketplace UIs still display a 78-digit number
with no semantic content.
Multiple side mappings
One mapping per dimension you wanted to encode. Storage cost grows linearly with what should have been one ID.
How LSP solves it
LSP8 uses bytes32 token IDs. The integer case still works — cast your uint256 to bytes32
and you have the same sequential model. When you need a content hash, you store the hash. When
you need a structured serial, you encode it. When you need a reference, you encode the address
plus selector.
The ID becomes a typed value, not a counter pretending to be a name.