nft-standards

Extend OpenZeppelin's ERC721URIStorage and ERC721Enumerable, then add a mint function with supply and payment checks. Set a max supply, mint price, and per-transaction limit, and generate token URIs pointing to IPFS metadata.

ERC-721 suits unique one-of-one assets like art or collectibles, while ERC-1155 handles multiple token types in one contract, ideal for game items with quantities. ERC-1155 also supports batch minting and transfers, reducing gas costs.

Implement the EIP-2981 interface by adding a royaltyInfo function that returns a recipient address and royalty amount calculated from the sale price. Marketplaces that support EIP-2981 will automatically honor these royalties on secondary sales.

IPFS metadata is cheaper and supports rich images, but depends on external file availability. On-chain metadata encodes JSON and SVG directly in the contract using Base64, guaranteeing permanence at higher gas cost.

Override the _beforeTokenTransfer hook to revert unless the sender or recipient is the zero address, allowing only minting and burning. This blocks all transfers between wallets while still letting owners destroy their token.

Use ERC721A instead of standard ERC721, which stores ownership data once per batch rather than per token. This significantly lowers gas when users mint multiple tokens in a single transaction.