Erc1155 - how does multisig mint?

[novaknole]

In OZ's erc1155, it seems there's only _mint function that calls _doSafeTransferAcceptanceCheck in the end which all the time checks that if receiver is contract, it should have the function onERC1155Received implemented on it.

1. Why is this restricted in ERC1155 and not in ERC721 ? in erc721, you can decide to use _mint or safeMint, but there's no option to decide in erc1155.
2. if so, how can multisig call mint on erc1155 and succeed ? multisig(gnosis let's say doesn't have onERC1155Received on it ..

Thank you.

[Amxx]

Hello @novaknole

@novaknole

it seems there's only _mint function that calls _doSafeTransferAcceptanceCheck

_doSafeTransferAcceptanceCheck is also called by _safeTransferFrom and is part of all transfers, not just mints.

@novaknole

Why is this restricted in ERC1155 and not in ERC721 ?

This is part of the ERC1155 standard (see the safe transfer rule section of https://eips.ethereum.org/EIPS/eip-1155). ERC721 and ERC1155 are two different standards, which different security mechanism. ERC1155 forces all transfers to be checked.

@novaknole

how can multisig call mint on erc1155 and succeed ?

You need to have onERC1155Received implemented, or a fallback mechanism that mimics it.

For gnosis safe:

• GnosisSafe is FallbackManager
• This will forward unknown calls like onERC1155Received to a fallback handler
• The default callback handler supports onERC1155Received
• Here is the gnosis integration tests