# ERC1155 Multi token

Most of tokens deploys only single type of token to Ethereum\
In economics fungibility is the property of a good which those goods are interchangeable.

### Why ERC721 would not work and ERC1155 needs to be created

### Simple-explanantion

ERC721 is a single token standard, if there is a game and player owns 100.000 different items of a game it means that the player or a game desinger would need to create 100.000 full smart contracts for the game. It's like request to buy a new laptop for every item created in a game. The costs of deploying 100.000 full smart contracts to blockchain would make impossible for any game studio to manage.

#### Storing the data

ERC1155 stores the items in a single smart contract with the minimum possible amount of data needed to recognise (distinguish) the token from others. The contract state contains configuration data per Token ID and all the behavior governing the collection.

#### Atomic swaps - trading multiple items

\[\[ERC1155]] Simplifies \[\[trading]] multiple items by \[\[batch]] the items into one contract and swapping them as a batch. Swapping tokens in 2 steps and 1 tx instead of 4 tx and X amount of steps depending on the amount of items that you wish to swap.

#### Multi Transfers

No need to confirm every item, instead you can batch the items into one or multiple accounts in a single tx.

#### Unification

Each item has its own unique identity and can be traded, indexed and fully fungible with others

Source: <https://blog.enjincoin.io/erc-1155-the-crypto-item-standard-ac9cf1c5a226>

## ERC1155 JSON Format

Stores:

* name
* decimals
* description
* image
* properties
* localization

Supporting only image files (images)

## Further reading

Full EIP Implementation and code: <https://github.com/ethereum/EIPs/issues/1155\\>
Full EIP implemented: <https://eips.ethereum.org/EIPS/eip-1155\\>
\[\[OpenSea]] implementation: <https://github.com/ProjectOpenSea/opensea-erc1155\\>
Simple explanation and implementation: <https://soliditydeveloper.com/erc-1155\\>
ERC1155 metadata URI Token Schema: <https://github.com/ethereum/EIPs/blob/master/EIPS/eip-1155.md#erc-1155-metadata-uri-json-schema>


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