NFT Registries

[wyc]

Hi, looking for feedback on this idea. Thanks.

User stories

• As an NFT minter, I want to create NFTs that don't necessarily belong to a collection and can be represented solely by their KT1 address and no index.
• As an NFT minter, I want to create "registries" of NFTs with rules for belonging, with the predicates specified as either on-chain views or TZIP-016 off-chain views.
  • For example, a registry with hard-coded NFT addresses in a list is logically the same as a fixed collection today.
  • For example, I can create and share a registry that contains all the NFTs I currently own because the hardcoded predicate is isOwner(<myaddress>).
  • For example, I can create a registry with a mutable ordered list-like data structure that is governed by Homebase, such as for a community NFT display shelf decided by the community.
  • For example, I can create a set of mutually exclusive registries such that an NFT can only exist in one of them at a time.
• As an NFT minter, I want to be able to also create nested registries, which can contain NFTs and other registries as entries.

Architectural recommendation

• Each NFT as a single smart contract
• Registry smart contract
• Collection as special case of Registry

Other considerations

• Increased tx fees for NFT minting (each mint would be an origination) and batch transfers
• Massive increase in composability