POC Creating dynamic NFTs to achieve cross-collection interoperable items.

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In this repository we will push the concept of the Metaverse by proving interoperability among already existing NFT collections. Thus new capabilities and expressiveness will be possible for the ecosystem.

Due to their open source nature, we will start with Decentraland Wearables which live in the Polygon and Ethereum network.

Version 0.1 - dNFT and Basic Image Manipulation.

• nft_collection: refers to the collection smart contract
• fp_nft: each NFT within the nft_collection
• dclwearable_nft: wearable NFTs from Decentraland
• dnft_image: Flying People dynamic ERC-721 image
• fp_image: layer_1 of the dnft_image

In this initial version we will generate a nft_collection of dynamic ERC-721 NFTs, from here on dNFT, named Flying People, from here on fp_nft, with the ability to link three other referenced NFTs using their contractAddress and tokenId, in this case Decentraland wearables NFT, from here on dclwearable_nft.

The references to these dclwearable_nft(s) will be stored in each fp_nft at the smart contract level to validate that the owner of a fp_nft is also the owner of the dclwearable_nft before linking them. Now we create a representation of an Avatar (Flying People) with the ability to equip a set of external NFTs as wearables.

In addition to the above, once the ownership of the items is proven in a contract function we will use Chainlink to call an API that we will generate a basic visual representation for the dynamic ERC-721 NFTs images from here on dnft_image, which in this case is composed of four different images - from here on called layers.

• In layer_1, the fp_image of a Flying People NFT is represented as a base shape.
• In layer_2, layer_3, and layer_4, the images of each dclwearable_nft (referenced in the fp_nft) will be used.

Allowing the NFT holder to set three assets, which will be three separated layers stored at the fp_nft animation_url

How it works

In this Proof of Concept we will use Chainlink, to call an API from our Contract, this API will get the dclwearable_nft metadata stored on IPFS (Interplanetary File System) and also will get the dclwearable_nft images required to compose the new dnft_image

Next a representation of fp_nft will be created with its user selected dclwearable_nft(s) through the Flying People API that generates and update the new dnft_image.

At the moment, the only missing segment to achieve a visual representation in this use case would be the Flying People API capable of combining the images from all sources and assembling a final image that represents a Flying People Avatar.

The following sequence diagram shows a flow for the proof of concept, which allows us to obtain the entire information stack of a fp_nft and its linked dclwearable_nft to generate the final image of an avatar by equipping a set of dclwearable_nft(s) to it.

Project directories

This repository contains three projects.

contracts

Solidity contracts for ERC721 Collection, includes Chainlink to call external API.

fp-dnft-app

DApp to claim a ERC721 Flying People DNFT, explore your collection, and set Wearables.

fp-dnft-api

Flying People API to serve DNFT images and update-wearables endpoint to update the DNFT images.