ERC-1155 Multi Token

ERC-1155 is Ethereum's standard for contracts that manage multiple token types simultaneously. Unlike ERC-20 (one token per contract) and ERC-721 (one NFT per contract), ERC-1155 can handle thousands of token IDs in a single contract. Each token ID can be fungible (ERC-20-like), non-fungible (ERC-721-like), or semi-fungible (N copies of the same unique asset). A single ERC-1155 contract enables batch operations: transfer 100 token A, 50 token B, and 1 token C in one transaction. This cuts gas costs by 30-50% compared to calling separate transfer functions. The standard includes hooks (onERC1155Received) to ensure recipient contracts know how to handle incoming tokens safely.