Blockchain Validated Asset Metadata (BVAM) is a method which allows Counterparty Token metadata to be stored off-blockchain yet still be verifiable and inalterable.
http://xcp.ninja is a proof of concept server for creating and storing BVAM json files.
Example BVAM json, http://xcp.ninja/hash/TB2rTB5FdLtqYu31wTmKgy54TYeZSqJgr3.json
Referenced Counterparty Asset, https://counterpartychain.io/asset/A11161111624187815485