Simple NFT playground (ERC-721 and ERC-1155)

Works to uncover in this project:

1. Creating a ERC-721 and ERC-1155 contract with Brownie and OpenZeppelin. Deployed on Sepolia Testnet.
2. Generating NFT metadata and pinning files into IPFS (pinata)

There are 3 types of NFT collectibles:

1. Simple Collectible (scripts/simple_collectible/)
   • A simple ERC-721 where users manually defined the Token URI everytime they mint a token.
   • There is no verification method on this collectible, therefore anyone can mint the token and impose any URI on it freely.
2. Advanced Collectible (scripts/advanced_collectible/) - Puppies Demo on OpenSea testnet
   • An ERC-721 token that will randomly choose an image (in img/) using VRF Coordinator V2 everytime a token is minted.
   • The scripts are capable of generating the suitable metadata for each minted token, automatically pin it to IPFS, and set the token URI.
   • Only owner and approved (available in ERC721URIStorage) senders that can set the token URI.
3. Multi Collectible (scripts/advanced_collectible/) - Puppies Multi Token on OpenSea testnet
   • An ERC-1155 token that will randomly choose which token will be minted everytime a user tries to create a collectible.
   • All the available assets should be pinned to IPFS before deployment, since the contract does not use URI storage.
   • Token URI will be automatically generated using the initialized base URI and token's contract ID.
   • The mint function, createCollectible(), is payable and the paid ETH amount will be used to determine the amount of NFT tokens to be minted according to the selected collection ID.
   • The token base URI can be updated after deployment by the owner only.