skins package

v0 - Unaudited: This is an initial version that has not yet been formally audited. Use in production at your own risk.

Package skins is the catalog of plane skins of gnofly, a multiplayer plane game, and the tokens of the skins sold. Every skin bought is a GRC721 token on gno.land/p/nt/grc721/v0, one per buyer and design.

The tokens are soulbound: there is no TransferFrom, no Approve and no SetApprovalForAll, and the token object is not exported, so nothing can move a skin away from its buyer. Its owner can Burn it, which gives back the storage deposit (not the price).

Supply is unlimited by default; an admin can cap a design. Classic, the look every pilot flies by default, is free and is not a token.

Writers:

• anyone buys a skin with its price attached (Buy), and burns their own (Burn);
• the admins of the game realm edit the catalog (SetSkin, SetSkinListed).

The realm keeps no roles and no money: admins and treasury are those of gno.land/r/g1t2kg2vtr3fukg43eujkn6x53gfdyakhngt4sfd/gnofly/game/v0, and every sale is forwarded to the treasury in the same transaction.

A token stores only its owner (the ledger), its design and an entry in the buyer's list: no metadata record and no URI. TokenURI is computed from the design. Reads are plain functions meant for vm/qeval: CatalogJSON, SkinsOf, OwnerOf, SkinOf, TokenURI, Render.