Package nft holds GnoRadio's concert tickets as GRC721 NFTs. It is permanent, like the data realm: a tickets release changes the rules, never this ledger, so no ticket ever moves to a new contract.
Only the realm that writes the tickets role now (data.Writer("tickets")) mints and transfers, only while that role is not paused, and only for the wallet that signs the transaction (OriginCaller): a release can never move the ticket of a holder who signs nothing. That is the whole guarantee. The signature proves the holder sent some transaction through the tickets writer, not that they asked for this move: a malicious tickets release (it takes over only after the data realm's public 72 h window, which the guardian can cancel) could move every ticket of a holder who then signs any call to it. This realm cannot see further up the call stack. Anyone reads.
A ticket's metadata and artwork are drawn on the fly from the tickets data (art.gno), whose record layout below is frozen for that reason.
EventSVG is the specimen ticket of a visible concert as a markdown image, or "" when the concert is not visible.
gnokey query vm/qeval -remote "https://rpc.onyx.testnets.gno.land" -data "gno.land/r/nym-alexiscolin000/gnoradio/tickets/nft.EventSVG()"