What is ERC-1155?

What is an ERC-1155?​

In this article lets see what is ERC -1155?

A smart contract multi-token standard for:

-fungible tokens (ERC-20)  
-NFTs (ERC-721)

ERC-721 v.s. ERC-1155​

ERC-721 tokens are good at identifying one type of object.

For example, balances are based on the entire contract for all tokenId values:

• Solidity

balanceOf(address)

ERC-1155 tokens are good at identifying multiple objects.

For example, balances are isolated based on unique tokenId values:

• Solidity

balanceOf(address, tokenId)

Vending Machine Analogy​

ERC-721:

-Example: Water Bottles
-Each tokenId represents a unique water bottle brand

ERC-1155:

-Example: Vending Machine Items
-Each tokenId can be a different vending machine item:
    -water bottles
    -snack bars
    -tea
    -trail mix

ERC-1155 Batch Transfer​

You can bulk transfer ERC-1155 tokens based on tokenId and quantity by calling:

• Solidity

safeBatchTransferFrom(address from, address to, uint256[] ids, uint256[] amounts, bytes data)

What do ERC-721 and ERC-1155 Contracts have in Common?​

OpenZeppelin contracts:

ERC721Holder.sol

and

ERC1155Holder.sol

are safety inheritance contracts. A contract must inherit these contracts to accept tokens being transferred to them.

However, ERC-20 tokens do not have a safety inheritance holder contract.

When transferring tokens to contracts, call smart contract functions that have “transferFrom()” behavior. It is recommended to only send tokens directly to a contract on test networks, otherwise, you risk accidentally burning your tokens.