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ERC-721 CATALOG Extension (builds upon ERC-6059 NEsted Hierarchy Spec) 

This Marketplace Catalog specification supports Catalog definition, Category NFT's, Category NFT hierarchy, Category NFT profile and Product Asset NFT Bundling. This specification is required to build a truly decentralized marketplaces. 

• Category Hierarchy: Extend Category ERC-721 NFT standard with the ERC-6059 hierarchy specification. ERC-6059 supports decentralized management of the marketplace category hierarchy.

• Category NFT: Introduce Category NFT metadata standard for managing detailed data.  NFT metadata schema includes Attribute Type definitions that can be used for marketplace site level search and facetted asset filtering.

• Product Asset NFT Bundling.  Category NFT contains an on-chain bundling of children Product Asset NFT's.

Example Marketplace that leverages this ERC-721 Catalog Extension link.

Authors Richard Pedersen (@rpedersen)

Created 2023-05-25

Requires EIP-721, EIP-165, EIP-6059,
Ownable, ERC6059, ERC721URIStorage

Github project

Table of Contents

• Abstract

• Motivation

• Specification

  • Schema

  • Example

• Rationale

  • Armatures

  • Metadata (Representations Files)

• Backwards Compatibility

• Security Considerations

• Copyright

Abstract

Concepts:

• Composability vs Layering.  Layering leads to centralized architecture.  Peer Composability with strong API definitions lend better decentralized peer-to-peer management.

• Catalog Nested Category NFT's.  Category NFT's can be from multiple Contracts.

• Category maintains a collection of sub-categories and NFT's.  Rather than NFT referencing a category.

Motivation

Specification

abstract contract ERC721CatalogExtension is Ownable, ERC6059, IERC721CollectionMetadata, IERC721CatalogExtension { .. }

• ERC6059:  enables Catalog to maintain a hierarchy of Category NFT's.  enables Category NFT's to manage collection of Product Asset NFT's

• IERC721CollectionMetadata: enables Catalog collection to contain metadata

• IERC721Metadata: enables Catalog NFT's to contain attribute (trait) type metadata 

ERC-721 Catalog extension is based on ERC-6059: Parent-Governed Nestable Non-Fungible Tokens.  ERC-6059 provides a hierarchical framework for managing Category NFT Hierarchy and bundling of Product Asset NFT's.  Here are the contributers to ERC-6059. 

• Bruno Škvorc (@Swader)
  https://github.com/Swader
  RMRK.app
  contact@bitfalls.com

• https://bruno.id
  NFT protocol development team

• Cicada (@CicadaNCR)
  https://github.com/CicadaNCR

• Steven Pineda (@steven2308), 

• Stevan Bogosavljevic (@stevyhacker), 

• Jan Turk (@ThunderDeliverer)

Similar Projects to draw ideas from

https://github.com/decentraland/marketplace-contracts

https://github.com/decentraland/schemas

https://github.com/ProjectOpenSea/seaport

https://github.com/ProjectOpenSea/seaport-core

https://github.com/windingtree/contracts

https://github.com/chain4travel

Marketplace toolkits

https://2muchcoffee.com/blog/how-to-build-an-opensea-like-nft-marketplace/

https://www.cs-cart.com/blog/non-fungible-tokens-how-to-start-nft-marketplace-like-opensea/